Fumio Kanaya | Researchain

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international microwave symposium | 1990

Mechanically tunable MSW bandpass filter with combined magnetic units

Youhei Ishikawa; Toshio Nishikawa; Takekazu Okada; Satoru Shinmura; Y. Kamado; Fumio Kanaya; Kikuo Wakino

An MSW (magnetostatic wave) bandpass filter with combined magnetic units composed of main and submagnetic units has been developed. Its volume is reduced to one fifth that of conventional yttrium-iron-garnet (YIG)-sphere filters. The filter can be tuned mechanically and keep the same shape of transmission response at 2.5 approximately 2.75 GHz. The insertion loss can be kept less than 3 dB within 20-MHz bandwidth by adjusting the magnetic field distribution.<<ETX>>

international microwave symposium | 1992

A miniaturized low-spurious 1.9 GHz MSW band-pass filter using YIG resonators with multi metal rings

Youhei Ishikawa; Takekazu Okada; Satoru Shinmura; Fumio Kanaya; Kikuo Wakino; Toshio Nishikawa

A simple technique for forming multiple metal rings on both sides of a YIG element has been developed to suppress the spurious responses of YIG resonators. By using this resonator, a 10-mm*5-mm*4-mm/sup 3/ two-stage MSW (magnetostatic wave) bandpass filter has been developed. The insertion loss is about 2 dB at 1.9 GHz and the suppression of spurious response is 25 dB. The filter is useful for signal processing in the circuits of portable microwave telecommunication sets because of its compact dimensions and excellent filter characteristics.<<ETX>>

Archive | 1995