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A novel compact dual-mode bandpass filter is implemented based on the TE102-TE201 mode cavity for millimeter-wave systems. Two transmission zeros generated by the cross coupling between two modes are observed within the upper and lower stop bands of the filter for the improvement of frequency selectivity. Furthermore, a balanced-to-unbalanced conversion is combined within the patch element for function...
Planar microstrip branch line couplers are simple but have narrow bandwidth and are unable to reject out-of-band signals adequately. This paper proposes a new feeding network for branch line couplers, using this feeding network the bandwidth of the coupler has a five-fold increase in bandwidth and with bandpass characteristics. The flat response is obtained by impedance matching from the feeding network,...
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