Abstract
This study develops a compact 28GHz bandpass fllter on a low-temperature co-flred ceramic substrate for applications in LMDS (Local Multipoint Distribution Service) bands. The fllter comprises two pairs of verticallystacked cross-coupled open loops with vertical interconnection structures, achieving compactness, high integration, and superior frequency selectivity. Attaining selective response with two transmission zeros requires adjusting the couplings of adjacent resonators and external quality factor. The open loops are fed by using the three-via vertical interconnections to prevent any electrical efiect on the fllter. Measurements correlate closely with the simulation results: this study achieved a bandwidth of 2.1GHz (27.6{29.7GHz) with two zeros located at 25.8GHz and 31.1GHz, and a compact size of 2:69 £ 2:66 £ 0:4mm 3 .
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