A miniaturized ceramic bandpass filter for cordless phone systems

Author

Kobayashi, S. ; Saito, Kazuyuki

Author_Institution

Adv. Technol. Res. Lab., Sumitomo Metal Ind. Ltd., Japan

fYear

1995

fDate

16-20 May 1995

Firstpage

391

Abstract

Miniaturized band-pass filter, which size is 3.0 mm/spl times/2.0 mm/spl times/1.5 mm, was developed by two different dielectric ceramics with low and high permittivities. The filter was constructed by putting strip line made by high permittivity ceramics (/spl epsi//sub r/=75) between micro strip line made by low permittivity ceramics (/spl epsi//sub r/=15). As its filter characteristics, two attenuation poles were observed at the lower frequency and higher frequency than the pass band. The reason for two attenuation poles´ appearances was discussed using the theoretical equivalent circuit.<>

Keywords

UHF filters; band-pass filters; cellular radio; ceramics; cordless telephone systems; equivalent circuits; passive filters; permittivity; poles and zeros; strip line filters; attenuation poles; band-pass filter; cordless phone systems; dielectric ceramics; equivalent circuit; microstrip line; miniaturized ceramic bandpass filter; permittivities; strip line; Band pass filters; Capacitors; Ceramics; Coupling circuits; Electromagnetic coupling; Equivalent circuits; Microstrip components; Microstrip filters; Permittivity; Strips;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1995., IEEE MTT-S International

Conference_Location

Orlando, FL, USA

ISSN

0149-645X

Print_ISBN

0-7803-2581-8

Type

conf

DOI

10.1109/MWSYM.1995.405962

Filename

405962