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Wideband Variable band-pass filter technique for the RFband is one of the key to the development of Multiband Transceiver. In this Work, At first, we designed and evaluated the Wideband variable band-pass filter of the double-tuned type that is available for the HFband(1.8MHz~30.5MHz).Only the adjustment of Capacitance of the double-tuned circuit, we achieved wideband impedance matching(5 times variable width)with fractional bandwidth Constant. Then, we report the Operational Overview and Evaluation results.

Takashi Chiba
Satoru Yokono