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One miniaturized multilayer dual-band bandpass fllter (BPF) is developed using standard low temperature co-flred ceramic (LTCC) technology. The fllter makes use of four double-folded substrate integrated waveguide (SIW) resonators. Two sets of coupling paths between the source and load are implemented to generate dual- band responses. Utilizing this method, the two passbands can operate at independent frequencies and the bandwidth can be easily controlled. High isolation is obtained between two passbands, and two pairs of transmission zeros close to the passband edges are generated by source- load coupling, resulting in high skirt-selectivity. Good agreement between the simulated and measured results of the fllter sample is obtained, with its high electrical performance validated.

DESIGN OF A MINIATURIZED DUAL-BAND DOUBLE-FOLDED SUBSTRATE INTEGRATED WAVEGUIDE BANDPASS FILTER WITH CONTROLLABLE BANDWIDTHS