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Wave propagation over terrain topologies and surface wave propagation relate to several practical applications the simulations of which often become very complex and reach their limits due to the size of objects. Exemplarily, one application is the illumination issue of wind turbines located on different terrains, such as hills in the context of potential bearing errors of the VHF omnidirectional...
In this contribution a vectorial channel sounding system for narrowband MISO applications is presented. The channel is measured using a continuous wave signal allowing the characterization of time-variant channels and Doppler shifts within changing multipath propagation environments. The channel sounder's architecture with an analog-digital converter writing the measured data to a SD-card enables...
A measurement setup is presented in a geometrically up-scaled environment to investigate intra device communication scenarios where an in-situ parameter variation at real scale is hardly feasible. Moreover, due to expected high frequencies and the electrical size of involved geometries numerical simulations are still demanding for such scenarios.
In this contribution a vectorial channel sounder with multiple transmitting antennas and one receiving antenna is presented. This channel sounder characterizes time variant propagation channels providing a measure of how wave propagation deviates from ideal free space propagation. In particular, it quantifies additional amplitude modulation characteristics in a multipath environment as well as a frequency...
The knowledge of the radar cross section (RCS) of aircraft and other objects is of great interest both for civil and military applications. Scaled setups are often used in order to facilitate RCS measurements in a well-defined laboratory environment. As radar frequencies steadily increase, for high scaling factors these measurements have to be carried out in the THz regime. In this paper, we propose...
This paper presents shielding effectiveness measurements of a small enclosure for motor control units in two frequency ranges from 10 kHz to 200 MHz and 200 MHz up to 3 GHz. Measurements take place in two different measurement environments, namely in a TEM-cell and in front of an absorber-covered wall. Due to little space in partly equipped enclosures, small field probes have to be used. This paper...
In this paper, wideband reflection and transmission properties of different materials are presented for a frequency range between 110 and 135 GHz. In particular, bistatic reflection profiles and transmission losses are measured for concrete, medium density fiberboard (MDF), gypsum plasterboard and double pane window glass samples. These measurements are compared with simulation results derived using...
Near-field measurements are an effective tool for determining antenna far-field patterns. Small electro-optical E-field sensors offer good possibilities for these kinds of measurements, because of their small size and their little influence on the antenna under test. In this paper we present a lithiumniobate-based electro-optical field sensor with a minimum sensitivity down to 20 mV/m, which is suitable...
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