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The paper reports a recent development of a narrowband high temperature superconducting (HTS) bandpass filter for future mobile communication systems. The filter is designed to have a 5 MHz passband in the UMTS base station's receive band. The filter exhibits an 8-pole quasi-elliptic function response implemented with a cascaded quadruplet coupling structure. The filter was fabricated on a 0.43 mm-thick sapphire wafer with double-sided YBCO films. The measured filter showed a midband insertion loss of 0.5 dB at 1973 MHz and a return loss better than À15 dB over the passband. It also exhibited an excellent rejection over the entire UMTS base station transmission band.

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The authors report on the recent development of a 2 Â 2 RF MEMS switch matrix for high power applications. The RF design and modelling of the switch matrix using full-wave electromagnetic (EM) simulations are described. The method of fabrication and experimental setup are presented. Results for the recorded RF performance for on and off states are presented. Power handling characteristics of the switch are also examined. Some challenging issues for the development of this type of device are addressed.

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