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We demonstrate a compact design for enhancing the 3dB beamwidth of a 60 GHz single-chip millimeter-wave frequency modulated continuous wave (FMCW) radar with integrated on-chip antennas. We use thin (Xfreespace/5) dielectric periodic lenses on top of the epoxy cover of the single-chip radar to change the effective material properties of the epoxy, which changes the field distribution and hence the...
Transmission-line models for high-frequency wideband applications should preferably directly relate to the physical dimensions and effects. Various simulation modes (both linear and non-linear in the frequency- and time-domain) point towards the use of a straightforward model using frequency dependent resistances, inductances, and capacitances. However, not all simulators accept frequency dependent...
Recently a number of polar transmitters for the multi-mode transmission of Wireless-Local-Area-Network (WLAN) and Bluetooth signals have been proposed. These polar transmitters use envelope modulators based on digital-to-analog converters (DACs) as power amplifiers. Such an approach is very useful when the maximum theoretical efficiency of the power-amplifier digital-to-analog converter (PA-DAC) is...
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