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A recent development of a twelve-pole high-temperature-superconducting (HTS) bandpass filter with group delay self-equalization for 3G wireless applications is reported. The filter is designed to have a 5.425 MHz pass-band at a centre frequency of 2121.5 MHz. The filter exhibits a quasi-elliptic function response implemented with a cascaded quadruplet (CQ) coupling structure. Two pair of complex frequency...
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