Title :
Tunable duplexer having multilayer structure using LTCC
Author :
Saitou, K. ; Kageyama, K.
Author_Institution :
Sumitomo Metal Electron. Devices Inc., Hyougo, Japan
Abstract :
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.
Keywords :
cellular radio; ceramics; digital radio; tuning; varactors; 1800 to 1900 MHz; 3.5 dB; GSM 1800/1900 digital cellular system; LTCC multilayer technology; multi-tuning method; tunable duplexer; varactor diode; Attenuation; Band pass filters; Cellular phones; Diodes; Frequency; Low pass filters; Nonhomogeneous media; Passband; Tunable circuits and devices; Varactors;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1210481
