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A novel ultra-wideband (UWB) bandpass filters using planar Marchand balun are proposed and demonstrated in this paper. Based on the intrinsic 180° phase difference of the planar Marchand balun and the transversal filter concepts, one kind of UWB bandpass filter (3 dB fractional bandwidth ranging from 86% to 111.5%) with two transmission zeros located close to the passband can be realized, by cascading...
A compact differential ultra-wideband (UWB) bandpass filter with high selectivity based on transversal filter concepts is proposed in this paper. Two transmission zeros and good harmonic suppression can be achieved for the differential mode, due to the two transmission paths with different lengths for input/output ports. Four quarter-wavelength shorted lines are added to improve the passband transmission...
In this paper, a novel microstrip differential filter with shorted parallel coupled-line is proposed. Based on the transversal signal-interference concept, a passband can be achieved when the differential mode signal is excited, while a stopband can be obtained when the common mode signal is excited. The proposed differential filter was analyzed and simulated. A prototype is fabricated for demonstration...
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