Abstract
This paper presents a compact fully tunable wide-band bandpass filter based on the varactors loaded quadruple mode coupled resonator. Triple adaptive transmission zeros (TZs) have achieved by reasonably setting the identical shifting mechanism architecture of transmission poles and adjacent TZs, which dramatically improve the selectivity. Meanwhile, it realized the tunable center frequency (CF) with a constant absolute bandwidth, resulting in the CF tuning range of 26.7 %, 25.8 %, and 15.6 % from 1.5 to 1.95 GHz. The bandwidth tuning range of 42.7 % can be achieved from 180 to 920 MHz with a fixed CF. The test results match well with the theoretical simulation so as to successfully validate the correctness of the proposed design approach.
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