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This paper presents the simulated and measured results for a miniaturized broadband rat-race hybrid for UHF biomedical and healthcare applications and TV white space systems. The hybrid was implemented on an FR4 substrate using spiral inductors and chip capacitors. For the frequency range of 430–710 MHz, which corresponds to the relative bandwidth of more than 49%, the rat-race hybrid exhibits power...
In this paper, a single-ended downconversion sub-harmonic mixer is implemented using 0.35-mum SiGe BiCMOS technology. Two lumped- element rat-races are applied to generate differential LO and RF signals. This single-ended rat-race mixer has the conversion gain of 25 dB and high port-to-port isolations at 10 GHz. The input return loss is about -10 dB and the compact chip size is 0.8 mm x 0.9 mm. The...
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