A new microstrip ultra-wideband (UWB) differential bandpass filter using two broadband planar Marchand baluns is proposed. Based on the transversal signal-interference concept, a passband with adjustable fractional bandwidth from 80 to 124% can be achieved for the differential mode, while the common mode can easily be suppressed in the whole frequency band. Good agreement is observed between simulation and measurement.
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Zhu et al. (2011) studied this question.
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