Rosenberger Hochfrequenztechnik GmbH and Co. KG

Fridolfing, Germany

Rosenberger Hochfrequenztechnik GmbH and Co. KG

Fridolfing, Germany
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Hiibner F.,Daimler AG | Thies S.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Schmidt H.,TE Connectivity | Dvorsky K.,Physical Software Solutions GmbH PSS
ICEC 2016 - 28th International Conference on Electric Contacts | Year: 2016

Developing a wiring harness for an electrical or hybrid car involves finding the optimal sizes of cables and connectors. They have to safely transfer the maximum current at the maximum ambient temperature without overheating. On the other hand they have to be as small as possible due to packaging, weight and, last but not least, cost considerations. Thermal simulation in an early phase of a car development is impeded by unsettled parameters and non-existent 3D models. This paper discusses several methods to cope with this situation. A methodology based on thermal networks and a standard set of parameters for the simulation of HV connectors are proposed. It is outlined how simulation models can be interchanged throughout a series development process while different simulation tools are being used without a standardised data format being available.


Ludwig A.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Schulz M.-L.,Keysight Technologies | Schindler P.,Infinera Corporation | Wolf S.,Karlsruhe Institute of Technology | And 3 more authors.
Optics Express | Year: 2015

A new modulation scheme with a sensitivity of 2.3 photons per bit at a bit-error ratio (BER) of 10-3 is discussed theoretically and demonstrated experimentally. We achieve a limiting sensitivity of 2.3 photons per bit (3.7 dB photons per bit) by stacking the modulation formats 64PPM, 4FSK and polarization-switched (PS) QPSK. This modulation stack encodes 11 bit per symbol (PPM: 6 bit, FSK: 2 bit, PS-PQSK: 3 bit). We also replaced 4FSK by 2ODFM (2-channel multiplex) for comparison. With 64PPM-2OFDM-PS-QPSK a total of 12 bit are encoded (PPM: 6 bit, 2 OFDM channels with PS-QPSK: 2 × 3 bit). Both modulation stacks show a similar limiting sensitivity and are probably the highest sensitivities so far reported for a BER of 10-3. Our theoretical considerations are supported by simulations and experiments. © 2015 Optical Society of America.


Armbrecht G.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Zietz C.,Leibniz University of Hanover | Denicke E.,Leibniz University of Hanover | Rolfes I.,Ruhr University Bochum
IEEE Transactions on Antennas and Propagation | Year: 2014

This paper concerns dielectric tube antenna design in the frequency range from 8.5 to 10.5 GHz for the use in the field of industrial radar level gauging for process automation industry. The application is based on monostatic radar configurations, which thus demands for highly directive endfire antennas made of chemically inert dielectrics, such as polytetrafluoroethylene (PTFE) or polypropylene (PP). Herein, the antennas consist of solid and tubular waveguides with cylindrical cross sections as well as transitions among these sections. In order to approach the promising theoretical directivity limits of thin-walled dielectric tubes at small aperture diameters, a fundamental HE11 mode-preserving waveguide transition forms the core element of the antenna. This yields compact dielectric antennas with directivity levels of around 20 dBi. By this means, a significant improvement in comparison to a circular metallic horn aperture of the same outer diameter as the radiating tube and a length reduction with regard to dielectric rod antennas is achieved. Finally, prototypes of the proposed antennas are manufactured and verified by measurements. © 2012 IEEE.


Zietz C.,Leibniz University of Hanover | Armbrecht G.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Schmid T.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Wollitzer M.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Geck B.,Leibniz University of Hanover
IEEE Transactions on Electromagnetic Compatibility | Year: 2015

This paper presents a general calibration procedure for probing RF voltages and currents in the time domain with conventional oscilloscopes using a directional coupler. It eliminates the need for a separate power calibration and takes advantage of the large dynamic range of a vector network analyzer during the calibration step. As a first application of this procedure, the electromagnetic disturbances on high-voltage (HV) lines in vehicles with hybrid or electric drive are precisely determined by applying an HV automotive-grade directional line coupler. In conjunction with the calibration algorithm, this coupler permits measuring the EMI relevant noise voltages and currents during real operation conditions of the vehicle without the need to modify the HV network by inserting LISNs or other artificial networks. The presented HV coupler offers a superior RF performance between its HV ports yielding an insertion loss of max. 0.8 dB and a return loss of min. 15 dB with respect to a typical low characteristic impedance of HV lines of 11 Ω over a frequency range from 150 kHz to 1 GHz. Thus, the coupler itself causes minimal influence on the original waveforms within the HV network and facilitates measurements very close to the noise sources, e.g., the power inverter, at a distinct calibration plane. Furthermore, it is shown how the accurate knowledge of these voltages and currents can be utilized to predict radiated emissions or to derive load impedances. Herein, the measurements are performed in a CISPR 25 related setup over a frequency range from 150 kHz to 500 MHz, achieving a good agreement to conventional measurement methods. © 1964-2012 IEEE.


Zietz C.,Leibniz University of Hanover | Armbrecht G.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Schmid T.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Geck B.,Leibniz University of Hanover | And 4 more authors.
Elektromagnetische Vertraeglichkeit in der KFZ-Technik, GMM-Fachtagung 2013 | Year: 2013

Electromagnetic compatibility is one of the major issues regarding high-voltage networks in hybrid or electric vehicles. In order to be able to accurately localize the sources of electromagnetic interference, it is necessary to directly measure the high-frequency, transient currents and voltages on the high-voltage cables below the screen. Hence, this paper presents a novel measurement system, consisting of directional couplers and a time domain measurement method with previous calibration of the couplers in the frequency domain. This system is able to perform the aforementioned task in the frequency range from 150 kHz to 1 GHz with negligible influence on the high-voltage network itself. It was already verified by measurements conducted in an electric vehicle.


Pezzei P.,Institute of Microwave and Photonic Engineering | Hinteregger M.,Institute of Microwave and Photonic Engineering | Plank T.,Institute of Microwave and Photonic Engineering | Ludwig A.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | And 4 more authors.
International Conference on Transparent Optical Networks | Year: 2015

In this contribution different types of transmitter misalignments are analysed with the ZEMAX and MATLAB software tools (including measurements) to show their influence on free space optical (FSO) links. The paper presents and defines a method to find the permissible lateral and angular transmitter misalignment of a unidirectional FSO link by changing different optical parameters. The analysis leads to an optimization of such link scenarios. The evaluated optical wireless link consists of a lens collimating the beam radiated by an optical source and another lens focusing the beam on a receiver area (detector). The received optical power is simulated in ZEMAX for different lateral and angular transmitter misalignments and additionally for various receiver area shifts out of the focal length of the lens at the detector site. Supplementary measurements are done to estimate the minimum received optical power (ROP) required for such misaligned FSO links under consideration of a given data rate of 10 Gb/s. Using MATLAB the simulated data are compared with the minimum ROP. The misalignment parameter value pair consisting of two entries is calculated, which describes succinctly the permissible lateral and angular transmitter misalignment of an optical wireless system. A configuration of a lens system for the transmitter and receiver of a unidirectional FSO link can be found by generating and comparing these pairs for various lens combinations. © 2015 IEEE.


Pezzei P.,Institute of Microwave and Photonic Engineering | Wurster C.,Rosenberger OSI GmbH and Co. OHG | Wollitzer M.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Fuchs M.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Leitgeb E.,Institute of Microwave and Photonic Engineering
International Conference on Transparent Optical Networks | Year: 2014

In this paper optical power distribution of free space optical propagation depending on the position of the receiving area is considered. A laser diode in continuous wave mode (cw-mode) defined by total optical emitted power and divergence angle was used for this study. The maximal observed distance between source and receiving area was 10 mm. In addition to the simulations of the received power depending on the receiver's position, measurements were also done for verification. Considerations concerning the power distribution of optical sources are inevitable for calculating link budgets. © 2014 IEEE.


D'Angelo L.T.,TU Munich | Tarita E.,Biosigna GmbH | Zywietz T.K.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Lueth T.C.,TU Munich
2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10 | Year: 2010

In this contribution, a system for internet based, automated home care ECG upload and priorisation is presented for the first time. It unifies the advantages of existing telemonitoring ECG systems adding functionalities such as automated priorisation and usability for home care. Chronic cardiac diseases are a big group in the geriatric field. Most of them can be easily diagnosed with help of an electrocardiogram. A frequent or long-term ECG analysis allows early diagnosis of e.g. a cardiac infarction. Nevertheless, patients often aren't willing to visit a doctor for prophylactic purposes. Possible solutions of this problem are home care devices, which are used to investigate patients at home without the presence of a doctor on site. As the diffusion of such systems leads to a huge amount of data which has to be managed and evaluated, the presented approach focuses on an easy to use software for ECG upload from home, a web based management application and an algorithm for ECG preanalysis and priorisation. © 2010 IEEE.


Schreiner S.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Armbrecht G.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Kunz S.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Schmid T.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Wollitzer M.,Rosenberger Hochfrequenztechnik GmbH and Co. KG
IEEE International Symposium on Electromagnetic Compatibility | Year: 2015

This paper presents a system concept for probing differential and common mode signals on shielded differential high speed automotive data links. Existing concepts like passive or active RF probing or balun-based probing are able to monitor either both modes without respect to the wave propagation direction or to measure only one mode in relation to the wave propagation direction. In contrast, the presented concept is able to measure the differential and the common mode signals with a low impact on the transmission line for both modes with respect to their direction of propagation. This novel feature is realized by separating the differential pair into single-ended structures within the test section, where bandwidth-adapted integrated couplers are applied. The result is a differential and common mode directional probe (DCDP), for which a PCB-based prototype has been manufactured and tested for a typical 3 Gbps low voltage differential signaling (LVDS) application in an automotive environment. The DCDP primarily addresses the ability of in-car measurements and provides a well defined handling of the cable screen. In a frequency range from 10 MHz up to 3 GHz, this prototype offers low mode conversion of less than -23 dB due to a highly symmetrical design as well as a directivity of more than 13 dB. © 2015 IEEE.

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