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The spirograph planar monopole antenna (SPMA) is combined with the proposed broadband ground plane to achieve unidirectional radiation patterns with enhanced gain and minimal broadside gain variation. The broadband ground plane is a simple structure that consists of a resistive card and a copper sheet in a fixed position. The measured impedance bandwidth for the unidirectional SPMA, with ...
A quadrature downconverter with 4 GHz IF bandwidth and working over the 0.5-20 GHz RF frequency range has been designed, fabricated, and tested. The downconverter uses a frequency doubling and dividing scheme to generate quadrature local oscillator signals from 0.5-17 GHz and a pair of Gilbert-cell mixers to perform downconversion. When the IF outputs are combined with a commercial quadrature hybrid,...
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