Rohde and Schwarz GmbH and Co. KG

München, Germany

Rohde and Schwarz GmbH and Co. KG

München, Germany
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Medler J.,Rohde and Schwarz GmbH and Co. KG
2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017 | Year: 2017

FFT-based measuring receivers can be used for EMI compliance measurements in accordance with Amendment 1 to 3rd Edition of CISPR 16-1-1 if this standard is referenced in the product standard. The use is motivated by reducing the scan time by several orders of magnitude and to get more insight due to the possibility of applying longer measurement times and enhanced measurement function like the persistence mode. Extensive comparison measurements on multimedia equipment in the scope of CISPR 32 were performed using conventional EMI receiver and FFT-based time-domain scanning technique. For precise and reproducible measurements the use of pre-selection filters is needed. © 2017 IEEE.


Ahmed S.S.,Rohde and Schwarz GmbH and Company KG | Genghammer A.,Rohde and Schwarz GmbH and Company KG | Schiessl A.,Rohde and Schwarz GmbH and Company KG | Schmidt L.-P.,Friedrich - Alexander - University, Erlangen - Nuremberg
IEEE Transactions on Microwave Theory and Techniques | Year: 2013

The demand on advanced personnel screening systems led to the development of several active and passive imagers. Among them, active multistatic imaging ensures high image quality and allows fully electronic screening. An active E-band imager is presented in this paper, which measures in real-time and delivers images of 30-dB dynamic range. Imaging of humans is achieved by optimizing the acquisition time using a dedicated digital signal processing solution. This paper introduces the system hardware, the calibration procedure, and several measurement results demonstrating high quality imaging capabilities. © 1963-2012 IEEE.


Medler J.,Rohde and Schwarz GmbH and Co. KG
IEEE International Symposium on Electromagnetic Compatibility | Year: 2014

The consideration of measurement instrumentation uncertainty (MIU) is common practice when determining compliance or non-compliance with a disturbance limit. But MIU is just a subpart of the standard compliance uncertainty (SCU) which also addresses uncertainties related to the EUT set-up, EUT operation and measurement procedure. One major influence quantity of SCU is the termination of cables leaving the test volume of the radiated disturbance measurement set-up. With the publication of Amendment A2 to 3rd Edition of CISPR 16-2-3 in 2014 new requirements for minimizing this effect become effective. It requires the termination of cables leaving the test volume using a ferrite type common mode absorption device (CMAD). The significant technical changes and measurement results with and without using CMAD are presented. © 2014 The Institute of Electronics, Information and Communication Engineer.


Medler J.,Rohde and Schwarz GmbH and Co. KG
IEEE International Symposium on Electromagnetic Compatibility | Year: 2014

FFT-based measuring instruments can be used for EMI compliance measurements in accordance with Amendment 1 to 3rd Edition of CISPR 16-1-1 if this standard is referenced in the product standard. The use is motivated by reducing the scan time by several orders of magnitude. A part of this time saving can be used for applying longer measurement times in order to reliably detect narrowband intermittent signals or isolated pulses. For precise and reproducible measurements the use of preselection filters is highly recommended. © 2014 The Institute of Electronics, Information and Communication Engineer.


Medler J.,Rohde and Schwarz GmbH and Co. KG
2016 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2016 | Year: 2016

Purpose of weighting along with the defined weighting function for the new RMS-Average detector is introduced. Extensive comparison measurements on multimedia equipment in the scope of CISPR 32 were performed using the required Quasi-Peak and Average detectors and the RMS-Average detector for both conducted and radiated emission measurements to confirm the weighting function and for the definition of emission limits for the RMS-Average detector. © 2016 IEEE.


Ahmed S.S.,Rohde and Schwarz GmbH and Co. KG
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Personnel screening is demanded nowadays for securing air traffic as well as critical infrastructures. The millimeterwaves are able to penetrate clothes and detect concealed objects, making them an attractive choice for security screening. Imaging methods based on multistatic architecture can ensure high quality imagery in terms of resolution and dynamic range. Following the advances in semiconductor technology, fully electronic solutions delivering real-time imaging are becoming feasible. Furthermore, the continuously increasing capabilities of digital signal processing units allow for the utilization of digital-beamforming techniques for image reconstruction, thus offering new opportunities for imaging systems to use sophisticated operation modes. Based on these modern technologies, an advanced realization addressing personnel screening in E-band with planar multistatic sparse array design is demonstrated.© 2013 SPIE.


Boss H.,Rohde and Schwarz GmbH and Co. KG
IEEE Microwave Magazine | Year: 2011

This special issue is a tribute to some of the best signal and power integrity experts worldwide. It is an honor to have the opportunity to work with these colleagues, and I am very grateful for their willingness to go through the effort of sharing their thoughts and ideas. Furthermore, I am grateful to the friends and colleagues of the Technical Committee (TC) MTT-9 on Digital Signal Processing, who have given me the confidence to be the chair of that TC. © 2011 IEEE.


Ahmed S.S.,Rohde and Schwarz GmbH and Co. KG | Schmidt L.-P.,Friedrich - Alexander - University, Erlangen - Nuremberg
Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012 | Year: 2012

The increasing demand on developing advanced imaging methods for the personnel screening applications has motivated many researchers to explore new techniques suitable to the emerging problem. Among the known methods, the active imaging using multistatic arrays in connection to digital-beamforming proofs efficient imaging with high image quality in terms of dynamic range and resolution. As any active imaging method, the illumination of the imaged object becomes an issue due to specular reflections. The human skin causes relatively strong specular reflections in the millimeter-wave range, and hence hinders the visibility of the body to some extend. Therefore, a consolidated understanding of the geometrical problem is essential for the optimization of the illumination issue. In this work, a simulation model is presented to address the problem precisely; and a measurement verification in the frequency range of 75 to 82 GHz is made to demonstrate the exactness of the proposed model. Additionally, an illumination analysis of a typical screening scenario of a human is presented. © 2012 IEEE.


Ahmed S.S.,Rohde and Schwarz GmbH and Co. KG | Schiessl A.,Rohde and Schwarz GmbH and Co. KG | Schmidt L.-P.,Friedrich - Alexander - University, Erlangen - Nuremberg
IEEE Transactions on Microwave Theory and Techniques | Year: 2011

The interest in active millimeter-wave and microwave imaging systems is increasing due to their utilization in security, medical, and industrial applications. Imaging systems using monostatic arrays suffer from the high number of antenna positions, making a fully electronic solution very costly and impractical. Multistatic arrays, however, offer the chance for high reduction factors in the number of antennas, and then allow for fully electronic solutions. Here, a new array architecture is presented, which is suitable for real-time operation and is capable of delivering high image quality in means of resolution and dynamic range. Various technological solutions were developed for the imaging purpose, which are introduced in detail. An example array for operation from 72 to 80 GHz is demonstrated. The imaging system hardware is introduced, along with several imaging results of humans with concealed objects. © 2006 IEEE.


Ahmed S.S.,Rohde and Schwarz GmbH and Company KG
2015 9th European Conference on Antennas and Propagation, EuCAP 2015 | Year: 2015

The screening of personnel at airports or critical infrastructure buildings is a challenging task, where a balance between the demanded security level and the concern of infringing their privacy is needed. This, accordingly, requires advanced fast scanning methods delivering operation comfort with an efficient threat detection. This paper presents modern screening systems based on an established millimeter-wave imaging technology. Additionally, a discussion on the various deployment possibilities is made showing the capabilities of a flexible and modular utilization. © 2015 EurAAP.

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