Title :
Mechanically tunable MSW bandpass filter with combined magnetic units
Author :
Ishikawa, Y. ; Nishikawa, T. ; Okada, T. ; Shinmura, S. ; Kamado, Y. ; Kanaya, F. ; Wakino, K.
Author_Institution :
Murata Manuf. Co. Ltd., Kyoto, Japan
Abstract :
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.<>
Keywords :
band-pass filters; garnets; magnetostatic wave devices; microwave filters; passive filters; tuning; yttrium compounds; 2.5 to 2.75 GHz; 20 MHz; 3 dB; YFe5O12; YIG based filter; bandwidth; combined magnetic units; garnets; insertion loss; magnetic field distribution; magnetostatic wave filters; main magnetic units; mechanically tunable MSW bandpass filters; submagnetic units; transmission response; tuned mechanically; volume; Band pass filters; Degradation; Fasteners; Insertion loss; Magnetic fields; Magnetic separation; Magnets; Microwave filters; Transducers; Tunable circuits and devices;
Conference_Titel :
Microwave Symposium Digest, 1990., IEEE MTT-S International
Conference_Location :
Dallas, TX
DOI :
10.1109/MWSYM.1990.99543
