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Prof. Dr.-Ing. Stefan Zorn

Hochfrequenztechnik Elektrische Messtechnik Leiterplattentechnologie

Fakultät Elektrotechnik und Medientechnik

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Beitrag in Sammelwerk/Tagungsband

  • Felix Sepaintner
  • Andreas Scharl
  • Johannes Jakob
  • M. Schmalzbauer
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

An Effective Surface Impedance Concept to Model Arbitrary Roughness Profiles on Printed Circuit Boards up to 110 GHz . [Accepted for publication]

  • (2023)
  • TC Teisnach Sensorik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Felix Sepaintner
  • M. Schmalzbauer
  • T. Wagner
  • Johannes Jakob
  • Andreas Scharl
  • A. Kasbauer
  • Raimund Förg
  • Werner Bogner
  • Stefan Zorn

Analysis of Inkjet-Printed Interdigital Capacitors on Low-Cost PCB Substrates up to 40 GHz Compared to Other Estabilished Manufacturing Technologies . [Accepted for publication]

  • (2023)
  • TC Teisnach Sensorik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Andreas Scharl
  • Felix Sepaintner
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

A Cost-Effective Method for Extracting the Complex Permittivity of Inner Layer Dielectric PCB Materials

  • (2021)

DOI: 10.23919/EuMC50147.2022.9784297

This paper presents a new cost-effective method to deduce the dielectric properties of substrate materials, which are used in inner layers of low cost printed circuit boards (PCBs). Two different on board structures are applied to estimate the desired complex permittivity in two different ways. On the one hand, a T-resonator based on substrate integrated waveguide technology (SIW) is used, on the other hand a stripline, whereby both are a combination of the outer layer laminate and the underlying prepreg. At first, the scattering parameters of both dielectric structures are measured with a vector network analyzer (VNA). The structures are then simulated with the finite integral method (FI) with all dielectric materials substituted by air. Afterwards, a second simulation with the dielectric constant (DK) of the known dielectric material is necessary. Next, the real part of the complex permittivity is calculated. Finally, the dissipation factor (DF) is calculated.
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • M. Schmalzbauer
  • Johannes Jakob
  • Andreas Scharl
  • Felix Sepaintner
  • K. Löbbicke
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Reliability Investigations of Additive Manufactured RF-Structures on Low-Cost PCB Materials Based on Inkjet Technology

  • (2021)

DOI: 10.23919/EuMC50147.2022.9784224

In this paper a reliability study of additively manufactured RF structures on printed circuit boards (PCB) based on inkjet technology is presented. First, the main focus is placed on the development of a suitable PCB test layout which contains microstrip lines, RF filters and ball grid array (BGA) structures. In order to ensure a good comparability with the standard subtractive technology, additive and standard manufactured structures are placed side by side. During our analysis both thermal and mechanical reliability tests were conducted. Possible changes in electrical properties were determined by subsequent RF measurements at multiple readouts. To our knowledge, for the first time an equivalent RF performance of additive and subtractive manufactured structures after stress tests up to 40 GHz was observed. Additionally, the compatibility of the additively manufactured structures with standard assembly processes are examined. Therefore, bond and solder tests are performed. Finally, an extensive assessment of all robustness tests is carried out and a recommendation about a future applicability in series products is given.
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
  • DIGITAL
Zeitschriftenartikel

  • Felix Sepaintner
  • M. Schmalzbauer
  • K. Lobbicke
  • Johannes Jakob
  • Andreas Scharl
  • Franz Xaver Röhrl
  • Roman Sammer
  • Werner Bogner
  • Stefan Zorn

Characterization of Additively Produced RF-Structures on Low-Cost PCB Materials Based on Inkjet Technology for Industrial Applications up to 80 GHz

In: IEEE Transactions on Components, Packaging and Manufacturing Technology vol. 11 pg. 1-11.

  • (2021)

DOI: 10.1109/TCPMT.2021.3118720

Usually, the printed circuit board industry has to use special subtractive manufacturing methods, if small line and space dimensions down to 50 μm are desired. This drastically raises production effort and costs. In this paper a method is shown, how the inkjet technology can be used to produce passive RF structures with minimum line and space dimensions of 25 μm. For the first time, this is possible over complete panels of low-cost PCB substrates, which have a relatively high surface roughness compared to ceramic or glass carriers. To ensure process reliability, printed lines must also be plated with an additional electroless copper layer to overcome the surface roughness with conductive layers and to lower insertion loss in the two-digit GHz range. Additionally, a surface impedance model is developed, which allows broadband first time right simulations. Finally, additively produced, passive RF filters are compared to their subtractive counterparts to show their benefits regarding production costs and electrical performance up to 80 GHz.
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Felix Sepaintner
  • M. Schmalzbauer
  • Johannes Jakob
  • Andreas Scharl
  • G. Weber
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Comparison of an Inkjet Fabrication Method on Low-Cost PCB Substrates With Semi Additive And Subtractive Technologies Regarding RF-Performance

pg. 266-268.

  • (2021)

DOI: 10.1109/IMWS-AMP53428.2021.9643887

  • TC Teisnach Optik
  • DIGITAL
Zeitschriftenartikel

  • M. Hrobak
  • K. Thurn
  • J. Moll
  • M. Hossain
  • A. Shrestha
  • T. Al-Sawaf
  • D. Stoppel
  • N. Weimann
  • A. Rämer
  • W. Heinrich
  • J. Martinez
  • M. Vossiek
  • T. Johansen
  • V. Krozer
  • M. Resch
  • J. Bosse
  • M. Sterns
  • K. Loebbicke
  • Stefan Zorn
  • M. Eissa
  • M. Lisker
  • F. Herzel
  • R. Miesen
  • K. Vollmann

A Modular MIMO Millimeter-Wave Imaging Radar System for Space Applications and Its Components

In: Journal of Infrared, Millimeter, and Terahertz Waves vol. 42 pg. 275-324.

  • (2021)

DOI: 10.1007/s10762-020-00736-9

This article presents the design and prototyping of components for a modular multiple-input-multiple-output (MIMO) millimeter-wave radar for space applications. A single radar panel consists of 8 transmitters (TX) and 8 receivers (RX), which can be placed several times on the satellite to realize application-specific radar apertures and hence different cross-range resolutions. The radar chirp signals are generated by SiGe:C BiCMOS direct-digital-synthesizers (DDS) in the frequency range of 1 to 10.5GHz with a chirp repetition rate of < 1μs within each TX and RX. The latter allows for easy interfaces in the MHz range in between the TX/RX units and therefore optimized 2-D sparse antenna arrays with rather large distances in between the TX/RX antennas. Furthermore, this allows for ideally linear frequency modulated continuous-waveforms (FMCW) in conjunction with phase-shift-keying (PSK) radar signals and enables simultaneous operation of all TX when code division multiplex (CDMA) modulation schemes are applied. Comparably low complexity of the TX/RX units has been achieved by applying straightforward frequency plans to signal generation and detection but comes with challenging requirements for the individual active and passive components. Tackled by thin film technology on alumina and the recently developed SiGe and InP semiconductor technologies, which have been further optimized in terms of process maturity and space qualification. Upconversion and downconversion to and from 85 to 94.5GHz are performed by double balanced Gilbert mixers realized with InP double heterojunction bipolar transistor technology (DHBT) and 42-GHz local oscillator signals from SiGe:C BiCMOS VCO synthesizer using phase-locked-loops (PLL). InP DHBT power amplifiers and low-noise amplifiers allow for output power levels of 15dBm and > 30dB gain with noise figure values of 9dB, respectively. The MIMO radar utilizes patch antenna arrays on organic multilayer printed circuit boards (PCB) with 18dBi gain and 18∘ half power beamwidth (HPBW). Generation of power supply and control signals, analog-to-digital conversion (ADC), and radar signal processing are provided centrally to each panel. The radar supports detection and tracking of satellites in distances up to 1000m and image generation up to 20m, which is required to support orbital maneuvers like satellite rendezvous and docking for non-cooperative satellites.
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
  • DIGITAL
Vortrag

  • Felix Sepaintner
  • Andreas Scharl
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Extracting Complex PCB Substrate Permittivity from a Transmission Line using the Finite Difference Integral Method from 10 GHz - 100 GHz . Invited Talk

In: 2020 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

Institute of Electrical and Electronics Engineers Inc. Suzhou, China

  • 29.07.2020 (2020)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • NACHHALTIG
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Andreas Scharl
  • Felix Sepaintner
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Design and Comparison of Filter Structures in the Millimetre Wave Frequency Range on Outer- and Inner-Layers of Organic Circuits Boards . [Invited Talk]

  • (2020)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Vortrag

  • Felix Sepaintner
  • Andreas Scharl
  • Florian Keck
  • Kevin Kunze
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Cost-Effective Implementation of Air-Filled Waveguides on Printed Circuit Boards . Invited Talk

In: IEEE Conference on Electrical Performance of Electronic Packaging and Systems (EPEPS)

Institute of Electrical and Electronics Engineers Inc. San José, CA, USA

  • 05.10.2020 (2020)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
  • NACHHALTIG
Beitrag in Sammelwerk/Tagungsband

  • Felix Sepaintner
  • Andreas Scharl
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Extracting Complex PCB Substrate Permittivity from a Transmission Line using the Finite Difference Integral Method from 10 GHz - 100 GHz . [Invited Talk]

  • (2020)

DOI: 10.1109/IMWS-AMP49156.2020.9199738

This paper presents a new numerical method to deduce the complex permittivity εr of PCB (printed circuit board) substrates. First, the attenuation and phase of an on board transmission line are measured with a vector network analyzer (VNA). The transmission line is then simulated with the finite difference integral method (FDI) with the substrate substituted by air. The measured and simulated phases are used, to calculate the effective permittivity and the real part of the complex permittivity εr ' . With known εr ' , the electromagnetic field distribution can be calculated, which is necessary to deduce the imaginary part of the permittivity. The shown algorithms can be used for frequencies up to 100 GHz and without any iterative processes.
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Felix Sepaintner
  • Andreas Scharl
  • Florian Keck
  • Kevin Kunze
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Cost-Effective Implementation of Air-Filled Waveguides on Printed Circuit Boards . [Invited Talk]

  • (2020)

DOI: 10.1109/EPEPS48591.2020.9231382

This paper presents a new cost-effective method to produce air-filled waveguides out of a printed circuit board (PCB) with a milling machine and how to implement them with standard PCB technology. For this purpose, low cost substrates like FR-4 are used. For the baseboard to waveguide transition in the E-Band (60-90GHz) a WR12 waveguide connector [1] was used. The WR12 waveguide was manufactured and analyzed on mechanical deviations. The RF performance in the E-Band was measured and compared to common PCB waveguides like microstrip lines (MS) and grounded coplanar waveguides (GCPW).
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
Vortrag

  • Andreas Scharl
  • Felix Sepaintner
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Design and Comparison of Filter Structures in the Millimetre Wave Frequency Range on Outer- and Inner-Layers of Organic Circuits Boards

In: 2020 50th European Microwave Conference (EuMC)

Institute of Electrical and Electronics Engineers Inc. Utrecht, The Netherlands

  • 15.09.2020 (2020)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
  • NACHHALTIG
Zeitschriftenartikel

  • Felix Sepaintner
  • Andreas Scharl
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Characterization and Production of PCB Structures With Increased Ratio of Electromagnetic Field in Air

In: IEEE Transactions on Microwave Theory and Techniques vol. 68 pg. 2134-2143.

  • (2020)

DOI: 10.1109/TMTT.2020.2983934

Producing passive printed circuit board (PCB) structures in the millimeter-wave range includes some fundamental challenges, such as low manufacturing costs and high fabrication accuracy. These aspects, in general, have to be combined with low signal attenuation, precise simulation models, and a reliable producibility. This article shows a new method to manufacture different kinds of passive RF waveguides with reduced attenuation and decreased electrical length on low-cost PCB substrates. First, the complex material parameters of the used substrate and the used copper foil are extracted from 10 to 100 GHz to have accurate simulation models in CST Microwave Studio. This is necessary because the parameters provided by the manufacturer are often no longer generally valid in this frequency range. In addition, PCB materials have a significantly higher surface roughness compared with conventional materials for millimeter-wave applications. Therefore, the correct determination and the correct modeling of surface roughness is particularly important. Next, laminate is removed partially on the outer layer of the PCB to increase the electromagnetic field ratio in air. The undesired substrate is removed by a CO2 laser drilling machine by setting narrow drills sequentially. The RF performance of these waveguides is compared with those manufactured in conventional PCB technology according to attenuation and producibility.
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Andreas Scharl
  • Felix Sepaintner
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Simulation and Measurement of PCB Crossover Structures from DC up to 70 GHz . [Invited Talk]

  • (2020)

In this paper, 4 different crossover structures in a 6-layered printed circuit board (PCB) for high operation frequencies are presented. The design for all structures is based on grounded coplanar waveguide (GCPW). Two fully planar structures, a quasi-coaxial transition and coaxial transition are realized and have a measured bandwidth from DC to 50 GHz and DC to 60 GHz, respectively. Moreover, two structures are designed in submount technology. Especially the connection between baseboard and package (solder junction) plays an important role to guarantee best signal integrity. Therefore, the quality of the solder junction is analysed in detail with TDR (time domain reflectometry) measurement as well as with X-ray images. The submount transitions show good radio frequency (RF) characteristics from DC to 70 GHz.
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
Zeitschriftenartikel

  • E. Hassan
  • B. Scheiner
  • F. Michler
  • M. Berggren
  • E. Wadbro
  • Franz Xaver Röhrl
  • Stefan Zorn
  • R. Weigel
  • F. Lurz

Multi-Layer Topology Optimization of Wideband SIW-to-Waveguide Transitions

In: IEEE Transactions on Microwave Theory and Techniques vol. 68 pg. 1326-1339.

  • (2020)

DOI: 10.1109/TMTT.2019.2959759

This article utilizes a topology optimization approach to design planar multilayer transitions between substrate integrated waveguides (SIWs) and rectangular waveguides (RWGs). The optimization problem is formulated based on the modal field analyses and Maxwell's equations in the time domain solved by the finite-difference time-domain (FDTD) method. We present a time-domain boundary condition based on the Klein-Gordon equation to split traveling waves at homogeneous waveguide ports. We employ the boundary condition to compute portal quantities and to devise an adjoint-field system that enabled an efficient computation of the objective function gradient. We solve design problems that include more than 105 000 design variables by using less than 400 solutions of Maxwell's equations. Moreover, a new formulation that effectively combats the development of in-band resonances in the design is presented. The transition configuration allows the direct mount of conventional RWG sections on the circuit board and aims to cover the entire K-band. The guiding structure of the optimized transition requires blind vias, which is realized by a simple and cost-efficient technique. In addition, the transition is optimized for three different setups that can be used to provide different field polarizations. The proposed transitions show less than 1-dB insertion loss and around 15-dB return loss over the frequency interval 18-28 GHz. Several prototypes are fabricated with an excellent match between the simulation and measurement results.
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
Vortrag

  • Andreas Scharl
  • Felix Sepaintner
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Simulation and Measurement of PCB Crossover Structures from DC up to 70 GHz . Invited Talk

In: 2020 German Microwave Conference (GeMiC)

Cottbus

  • 09.03.2020 (2020)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
  • NACHHALTIG
Vortrag

  • Felix Sepaintner
  • Andreas Scharl
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Simulation and Manufacturing of Low Loss PCB Structures with Additional Electromagnetic Field in Air . Invited Talk

In: IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes (IMWS-AMP)

Bochum

  • 16.-18.07.2019 (2019)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Bericht/Report

  • Franz Xaver Röhrl
  • Siegfried Hildebrand
  • Johannes Jakob
  • Stefan Zorn
  • Werner Bogner

Projekt NePUMuk (Neue digitale Produktions- und Mikrostrukturierungstechnologien für Anwendungen bis 80 GHz) . Abschlussbericht

Technische Hochschule Deggendorf (THD)/Technologie Campus Teisnach

  • 2019 (2019)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Felix Sepaintner
  • Andreas Scharl
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

Simulation and Manufacturing of Low Loss PCB Structures with Additional Electromagnetic Field in Air

  • (2019)

DOI: 10.1109/IMWS-AMP.2019.8880079

This paper presents a new method to produce different kinds of RF waveguides with reduced attenuation on low cost PCB substrates. First, microstrip (MS) and grounded coplanar waveguides (GCPW) are characterized by considering rough conductors in CST Microwave Studio. Next, laminate is partially removed, to increase the electromagnetic field ratio in air. Accordingly, the dielectric losses are reduced and the electrical length is decreased. These conductors are produced by using a CO 2 laserdrilling machine to remove the undesired substrate. The RF performance (DC to 100 GHz) of these waveguides is compared to transmission lines manufactured in conventional PCB technology. Finally, different kinds of simulated and produced microstrip filters are shown and fabrication tolerances are compared to those produced in standard technology.
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Vortrag

  • Johannes Jakob
  • R. Sammer
  • Franz Xaver Röhrl
  • Werner Bogner
  • Stefan Zorn

WR12 to planar transmission line transition on organic substrate . Invited Talk

In: 49th European Microwave Conference (EuMC)

Paris, Frankreich

  • 29.09.-04.10.2019 (2019)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Johannes Jakob
  • R. Sammer
  • Franz Xaver Röhrl
  • Stefan Zorn
  • Werner Bogner

WR12 to planar transmission line transition on organic substrate

  • (2019)

DOI: 10.23919/EuMC.2019.8910843

Transitions for planar transmission lines on printed circuit boards to rectangular waveguide are challenging to design and manufacture. This paper introduces two transitions, the first one is a broadband transition from WR12 (60-90 GHz) waveguide to a stripline (SL) and the second is a narrowband transition to a grounded coplanar waveguide (GCPW). The focus at the first transition is based on the fact that signals can be transmitted in the complete E-Band. In the process, many manufacturing possibilities were exploited. For the second transition, the focus was on manufacturability in order to achieve the most cost effective transition possible. Design, simulated and measured results will be presented.
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
Zeitschriftenartikel

  • Franz Xaver Röhrl
  • Johannes Jakob
  • Werner Bogner
  • R. Weigel
  • Stefan Zorn

Bare die connections via aerosol jet technology for millimeter wave applications

In: International Journal of Microwave and Wireless Technologies vol. 11 pg. 441-446.

  • (2019)

DOI: 10.1017/S1759078719000114

This paper presents a comparison of chip connections using aerosol jet (AJ) and bond technology on low-cost printed circuit board (PCB) substrates. First, the behavior of the used gap filler material and the used silver ink for AJ technology on PCBs are characterized. In addition to comparing the radio frequency (RF) performance (DC to 67 GHz) of the two technologies, the mechanical stability is also compared. While the AJ technology transitions score above all for their RF performance and the lower requirements (surface finish, pad size, and adhesion) on the PCB, the bonding technology has clear advantages, especially with a different coefficient of thermal expansion values of the substrates to be connected. Finally, the measurement results of a complete package are shown, whereby the chip connection is realized once by means of AJ and once by bonding wires.
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Franz Xaver Röhrl
  • Johannes Jakob
  • Werner Bogner
  • R. Weigel
  • Stefan Zorn

Bare Die Connections via Aerosol Jet Technology for Millimeter Wave Applications

  • (2018)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Franz Xaver Röhrl
  • Roman Sammer
  • Johannes Jakob
  • Werner Bogner
  • R. Weigel
  • U. Hassel
  • Stefan Zorn

Cost-Effective SIW Band-Pass Filters for Millimeter Wave Applications

  • (2017)

DOI: 10.23919/EuMC.2017.8230878

  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
  • DIGITAL
Bericht/Report

  • Franz Xaver Röhrl
  • Siegfried Hildebrand
  • Johannes Jakob
  • Stefan Zorn
  • Werner Bogner

Projekt NePUMuk (Neue digitale Produktions- und Mikrostrukturierungstechnologien für Anwendungen bis 80 GHz) . Projektbericht

Technische Hochschule Deggendorf/Technologie Campus Teisnach

  • 2017 (2017)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Franz Xaver Röhrl
  • Johannes Jakob
  • Werner Bogner
  • D. Hageneder
  • Stefan Zorn

Differential Wideband Interconnects for Organic Millimeter Wave Chip Packages . An effort to design an all-purpose RF chip package

pg. 1465-1468.

  • (2016)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Franz Xaver Röhrl
  • Johannes Jakob
  • Werner Bogner
  • D. Hageneder
  • Stefan Zorn

Differential Wideband Interconnects for Organic Millimeter Wave Chip Packages . An effort to design an all-purpose RF chip package

pg. 536-539.

  • (2016)
  • TC Teisnach Optik
  • DIGITAL
Vortrag

  • Stefan Zorn

High Frequency PCB Design up to 67 GHz . Workshop

In: European Microwave Week 2013

Nürnberg

  • 06.-11.10.2013 (2013)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • A. Goetz
  • R. Rose
  • Stefan Zorn
  • G. Fischer
  • R. Weigel

Performance of Coherent Time Delay Estimation Techniques for Frequency Hopping GSM Signals

pg. 25-28.

Piscataway, NJ

  • (2012)
In this paper, the performance of coherent time delay estimation techniques for frequency hopping GSM signals is investigated. It is demonstrated that the techniques enable the usage of a substantially higher bandwidth for time delay estimation and localization purposes compared to state-of-the-art techniques. Since resolution and noise performance directly depend on the applied bandwidth of the signals, major improvements can be realized. For E-GSM 900 systems, an overall bandwidth of up to 35 MHz may be used which enables time delay estimation and localization in the scale of a few meters. The coherent time delay estimation techniques are therefore ideally suited for search and rescue applications.
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • Stefan Zorn
  • M. Gardill
  • R. Rose
  • A. Goetz
  • R. Weigel
  • A. Koelpin

A smart jamming system for UMTS/WCDMA cellular phone networks for search and rescue applications

pg. 1-3.

Piscataway, NJ

  • (2012)

DOI: 10.1109/MWSYM.2012.6257769

Recent statistics show an increase in environmental disasters, a fact which is also perceivable to the public as reports of avalanches, earthquakes and landslides mount in media coverage. This paper introduces one part of the I-LOV project, endorsed by the German Federal Ministry of Education and Research. In this project partners from relief organizations, universities and industry investigate enhancements to disaster handling and victim rescue. One possible option is to take advantage of the fact, that a lot of people own a mobile phone today. To locate a person by his or her mobile phone requires to take over the phone by an own Base Transceiver Station (BTS). Jamming all other networks is one option to achieve that. This paper will introduce a new Field Programmable Gate Array (FPGA) based jamming system which disturbs only the absolute necessary parts of the WCDMA spectrum but reliably cuts all connections between mobile stations (MS) and existing BTS. The whole system including the signal generator and the front end will be discussed. Also measurement results will be shown.
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Vortrag

  • A. Goetz
  • Stefan Zorn
  • R. Rose
  • G. Fischer
  • R. Weigel

Ortung von GSM Mobiltelefonen zur Vermissten- und Verschüttetensuche

In: Electrical and Electronic Engineering for Communication (EEEfCOM) 2011

Ulm

  • 25./26.05.2011 (2011)
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Vortrag

  • A. Goetz
  • Stefan Zorn
  • R. Rose
  • G. Fischer
  • R. Weigel

A Time Difference of Arrival System Architecture for GSM Mobile Phone Localization in Search and Rescue Scenarios

In: Workshop on Positioning, Navigation and Communication (WPNC)

Dresden

  • 07.-08.04.2011 (2011)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • Stefan Zorn
  • G. Bozsik
  • R. Rose
  • A. Goetz
  • R. Weigel
  • A. Koelpin

A power sensor unit for the localization of GSM mobile phones for search and rescue applications

pg. 1301-1304.

[Piscataway, N.J.]

  • (2011)

DOI: 10.1109/ICSENS.2011.6127162

Email Print Request Permissions Recent statistics show an increase in environmental disasters, a fact which is also perceivable to the public as reports of avalanches, earthquakes and landslides mount in media coverage. Recent examples are Haiti 2010 and Fukushima 2011. Search and Rescue with modern localization techniques consequently attracts attention from scientific and industrial sides. This paper introduces a field strength measurement unit, which is part of the I-LOV project1. In this project partners from relief organizations, universities, and industry investigate enhancements in disaster handling and victim rescue. One possible option is to take advantage of the fact that most people own a mobile phone today and take it with them the whole day. To locate a person by his or her mobile phone requires to find the maximum of its radiated field strength. This paper will show a new power sensor unit for GSM signals. The complete design flow from requirements considerations to measurement results will be demonstrated. A dynamic range of 107 dB is only one of the remarkable outcomes.
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • Stefan Zorn
  • R. Rose
  • A. Goetz
  • R. Weigel
  • A. Koelpin

A New System for Mobile Phone Localization for Search and Rescue Applications

Stuttgart

  • (2011)
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Vortrag

  • M. Gardill
  • Stefan Zorn
  • R. Weigel
  • A. Koelpin

Influencing Cell Reselection of UMTS User Equipment Using Interference Injection . Workshop

In: Workshop on Radar, Communication and Measurement (RADCOM)

Hamburg

  • April 2011 (2011)
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Beitrag in Sammelwerk/Tagungsband

  • R. Rose
  • Stefan Zorn
  • A. Goetz
  • G. Fischer
  • R. Weigel

A new technique to improve AoA using dual polarization

pg. 420-423.

[London, UK]

  • (2011)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • A. Goetz
  • R. Rose
  • Stefan Zorn
  • G. Fischer
  • R. Weigel

A Burst Phase Analysis Technique for High Precision Time Delay Estimation of Frequency Hopping GSM Signals

pg. 1446-1449.

Piscataway, NJ

  • (2011)
In this paper, a novel burst phase analysis technique for high precision time delay estimation of frequency hopping GSM signals is presented. The technique makes use of the increased bandwidth of frequency hopping waveforms and acquires and processes the signals in a coherent way. This way, the actual applicable bandwidth for time delay estimation and localization purposes is increased significantly. In case of E-GSM 900 systems, up to 35MHz of bandwidth can be used which enables localization of mobile phones in the order of a few meters. The technique is therefore ideally suited for search and rescue applications. The presented method may also be applied to TETRA, DECT, IEEE 802.15.4 (ZigBee) or IEEE 802.15.1 (Bluetooth) signals.
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Beitrag in Sammelwerk/Tagungsband

  • Stefan Zorn
  • M. Maser
  • A. Goetz
  • R. Rose
  • R. Weigel

A power saving jamming system for E-GSM900 and DCS1800 cellular phone networks for search and rescue applications

pg. 33-36.

Piscataway, NJ

  • (2011)

DOI: 10.1109/WISNET.2011.5725020

Recent statistics show an increase in environmental disasters, a fact which is also perceivable to the public as reports of avalanches, earthquakes and landslides mount in media coverage. Search and Rescue with modern localization techniques consequently attracts attention from scientific and industrial sides. This paper introduces one part of the I-LOV project, endorsed by the German Federal Ministry of Education and Research. In this project partners from relief organizations, universities and industry investigate enhancements to disaster handling and victim rescue. One possible option is to take advantage of the fact, that a lot of people own a mobile phone today. To locate a person by his or her mobile phone requires to take over the phone by an own Base Transceiver Station (BTS). Jamming all other networks is one option to achieve that. This paper will introduce a new Field Programmable Gate Array (FPGA) based jamming system which consumes little power and disturbs only small parts of the GSM spectrum but reliably cuts all connections between mobile stations (MS) and existing BTS.
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • R. Rose
  • C. Meier
  • Stefan Zorn
  • A. Goetz
  • R. Weigel

A GSM-network for mobile phone localization in disaster scenarios

pg. 1-4.

Piscataway, NJ

  • (2011)
This paper deals with an adjustment and an implementation of a modified GSM-network. This network is necessary to enable the localization of mobile phones, primarily in disaster scenarios. In order to localize a mobile phone it is mandatory, that the phone transmits a signal. As a mobile phone transmits only sporadically without request, it has to be enforced to send a signal to be localized. The enforcing of a transmission is done by means of bringing up an auxiliary GSM-network. The configuration of the GSM-network allows the usage of a special handover procedure with frequency hopping. The implementation of frequency hopping considerably increases the accuracy of applied localization techniques.
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Vortrag

  • A. Goetz
  • R. Rose
  • Stefan Zorn
  • G. Fischer
  • R. Weigel

Algorithms for High Resolution Time Difference of Arrival Estimation for GSM Mobile Phones

In: Kleinheubacher Tagung 2011

Miltenberg

  • 26.-28.09.2011 (2011)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • A. Goetz
  • R. Rose
  • Stefan Zorn
  • G. Fischer
  • R. Weigel

A wideband crosscorrelation technique for high precision time delay estimation of frequency hopping GSM signals

pg. 33-36.

[London, UK]

  • (2011)
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Beitrag in Sammelwerk/Tagungsband

  • A. Goetz
  • Stefan Zorn
  • R. Rose
  • G. Fischer
  • R. Weigel

A time difference of arrival system architecture for GSM mobile phone localization in search and rescue scenarios

pg. 24-27.

Piscataway, NJ

  • (2011)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • M. Gardill
  • Stefan Zorn
  • R. Weigel
  • A. Koelpin

Triggering UMTS user equipment inter-RAT cell reselection using noise jammers

pg. 1-4.

Piscataway, NJ

  • (2011)
In this work a strategy for triggering an interradio access technology cell reselection in UMTS user equipment is proposed. All mobile devices within the effective range of a transmitter radiating a noise-like RF signal on the UMTS downlink frequency bands are forced to leave the UMTS cells and camp on non-UMTS cells, such as e.g., GSM. This allows to use a GSM based localization technique even in areas with UMTS coverage. In contrast to classical RF communication jammers which focus on disrupting the communication link, our exclusive goal is to trigger the inter-RAT cell reselection to GSM. In particular we estimate the necessary jammer RF power by examining the cell reselection procedure running in the user equipment (UE) and using some exemplary geographical scenarios. We use a hardware system to proof the results.
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Vortrag

  • Stefan Zorn

A Novel Technique for Mobile Phone Localization for Search and Rescue Applications

In: Fachausschusssitzung der Informationstechnischen Gesellschaft (ITG)

Ilmenau

  • 2010 (2010)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • Stefan Zorn
  • R. Rose
  • A. Goetz
  • R. Weigel

A novel technique for mobile phone localization for search and rescue applications

pg. 1-4.

[Piscataway, N.J.]

  • (2010)

DOI: 10.1109/IPIN.2010.5647107

Recent statistics show an increase in environmental disasters, a fact which is also perceivable to the public as reports of avalanches, earthquakes and landslides mount in media coverage. Search and Rescue with modern localization techniques consequently attracts attention from scientific and industrial sides. This paper introduces one part of the I-LOV project, endorsed by the Federal Ministry of Education and Research Germany. Here partners from relief organizations, universities and industry investigate enhancements to disaster handling and victim rescue. One possible option is to take advantage of the fact, that a lot of people own a mobile phone today. Future developments in the area of mobile phone detection by field intensity measurements will be addressed in this paper.
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Vortrag

  • Stefan Zorn

A new Approach on Mobile Phone Localization for Search and Rescue Applications

In: ITG-Fachausschuss 7.2: Funksysteme "Funklokalisierung - sicher, schnell und genau"

Technische Universität Ilmenau Ilmenau

  • 04.11.2010 (2010)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Vortrag

  • Stefan Zorn

Localization for Search and Rescue Applications . Workshop

In: 2009 IEEE Radio Wireless Symposium (RWS)

San Diego, CA, USA

  • 18.-22.01.2009 (2009)
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Vortrag

  • Stefan Zorn

Localization for Search and Rescue Applications . Workshop

In: EEEfCOM 2009

Ulm

  • Juni 2009 (2009)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Vortrag

  • A. Goetz
  • R. Rose
  • Stefan Zorn
  • R. Weigel

Ortung von GSM-Mobiltelefonen in Katastrophenszenarien

In: Navigationskonvent 2009 der Deutschen Gesellschaft für Ortung und Navigation e.V. (DGON)

Berlin

  • 09.-10.07.2009 (2009)
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik
Vortrag

  • R. Rose
  • Stefan Zorn
  • A. Goetz
  • R. Weigel

Ortung verschütteter Personen anhand ihrer GSM-Mobiltelefone

In: RadioTecC – Transmit&TestSolutions 2009

Berlin

  • 18.11.2009 (2009)
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Vortrag

  • A. Goetz
  • Stefan Zorn
  • R. Rose
  • R. Weigel

Ortung von GSM-Mobiltelefonen in Katastrophenszenarien

In: ION-CH AHORN 2009 (Eidgenössische Technische Hochschule Zürich)

Swiss Institute of Navigation Zürich, Schweiz

  • 05.-06.11.2009 (2009)
  • Elektrotechnik und Medientechnik
  • TC Teisnach Optik
Beitrag in Sammelwerk/Tagungsband

  • Stefan Zorn
  • H. Ehm
  • R. Weigel

A Novel Technique for Determining Kernels of Volterra Based Behavioral Models for RF Amplifiers

pg. 246-249.

London

  • (2008)

DOI: 10.1109/EUMC.2008.4751434

This paper presents a new technique to determine the kernels of Volterra series based behavioral models of RF amplifiers in the frequency domain. A model with three kernels and a memory length of one is developed. The kernels of this model are assigned only by using a two-tone test. No knowledge of the integrated circuit is needed to determine all model parameters. The derivation of such a model out of well known mathematical basics is shown such as the used measurement setup. Measured data and simulation deliverables are being compared and show a good match. A comparison between a Saleh model and the new modeling approach concludes this paper.
  • TC Teisnach Optik
  • Elektrotechnik und Medientechnik