A first practical model of very small and low insertion loss laminated duplexer using LTCC suitable for W-CDMA portable telephones

Author

Ishizaki, T. ; Miyake, H. ; Yamada, T. ; Kagata, H. ; Kushitani, H. ; Ogawa, K.

Author_Institution

Device Eng. Dev. Center, Matsushita Electr. Ind. Co. Ltd., Japan

Volume

1

fYear

2000

fDate

11-16 June 2000

Firstpage

187

Abstract

A laminated duplexer using Low Temperature Co-fired Ceramics (LTCC) has been developed for the first time practically. The technologies of reducing the insertion loss are explained. They include the new ceramic-lamination process and the filter circuit design. The inner electrodes for the resonators are thicken by the state-of-art ceramic lamination process. The design of a laminated band elimination filter is also studied. As the result, its size is reduced by 30% comparing to a conventional mono block duplexer, while the performances are almost the same. It is very suitable for the next generation W-CDMA portable telephones.

Keywords

UHF filters; band-stop filters; cellular radio; ceramics; code division multiple access; losses; passive filters; resonator filters; strip line filters; strip line resonators; telephone sets; LTCC; W-CDMA portable telephones; band elimination filter; ceramic-lamination process; compact duplexer; filter circuit design; laminated duplexer; low insertion loss; low temperature co-fired ceramics; resonators; Ceramics; Circuit synthesis; Electrodes; Insertion loss; Lamination; MONOS devices; Multiaccess communication; Process design; Resonator filters; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest. 2000 IEEE MTT-S International

Conference_Location

Boston, MA, USA

ISSN

0149-645X

Print_ISBN

0-7803-5687-X

Type

conf

DOI

10.1109/MWSYM.2000.860933

Filename

860933