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Tunable duplexer having multilayer structure using LTCC

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2 Author(s)
K. Saitou ; Sumitomo Metal Electron. Devices Inc., Hyougo, Japan ; K. Kageyama

A tunable duplexer has been designed for GSM1800/1900 digital cellular system. The tunable duplexer has been fabricated with LTCC (Low Temperature Co-fired Ceramics) multilayer technologies assisted by varactor diodes. To accomplish higher attenuation for each system, multi-tuning method, which enables to control the passband and the stopband independently, is applied. Size is designed as 5.7/spl times/5.7/spl times/1.8mm. Insertion losses are less than 3.5dB. Attenuation is more than 25dB at Fo+200MHz in Tx, and is more than 10dB at F0-150MHz in Rx.

Published in:

Microwave Symposium Digest, 2003 IEEE MTT-S International  (Volume:3 )

Date of Conference:

8-13 June 2003