A low-loss magnetostatic wave filter using parallel strip transducer

Author

Nishikawa, T. ; Wakino, K. ; Tanaka, H. ; Shinmura, S. ; Ishikawa, Y.

Author_Institution

Murata Manuf. Co. Ltd., Kyoto, Japan

fYear

1989

fDate

13-15 June 1989

Firstpage

153

Abstract

A configuration for a magnetostatic forward bulk wave (MSFBW) filter is proposed. The proposed filter uses seven parallel strip transducers and three metal disks loaded on YIG (yttrium iron garnet) film. The radiation impedance of the filter was calculated using a Fourier transform relation between the MSFBW field amplitude and the transducer spatial current distribution. The dependence of YIG film thickness on the 3-dB bandwidth is shown. The transducer design, considering radiation impedance matching using parallel strips, yields a large coupling coefficient with the YIG film. An insertion loss of 6 dB was achieved in the 0.7-5.2-GHz band, and an insertion loss of 4 dB was achieved in the 2.8-3.9-GHz band.<>

Keywords

magnetostatic wave devices; microwave filters; transducers; 0.7 to 5.2 GHz; 2.8 to 3.9 GHz; 4 dB; 6 dB; Fourier transform relation; YFe5O12; YIG; coupling coefficient; insertion loss; low-loss magnetostatic wave filter; magnetostatic forward bulk wave; parallel strip transducer; parallel strip transducers; radiation impedance; radiation impedance matching; spatial current distribution; Filters; Garnet films; Impedance; Insertion loss; Iron; Magnetic separation; Magnetostatic waves; Strips; Transducers; Yttrium;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1989., IEEE MTT-S International

Conference_Location

Long Beach, CA, USA

Type

conf

DOI

10.1109/MWSYM.1989.38691

Filename

38691