Title :
High isolation techniques for SAW duplexer modules
Author :
Shiba, Takashi ; Kamogawa, Naoko ; Ishizaki, Tatsuhiko ; Okajima, Daini ; Hosaka, Norio ; Moteki, Minoru ; Ogawa, Seiichi ; Oda, Koji ; Hikita, Mitsutaka
Author_Institution :
Hitachi Media Electron. Ltd, Yokohama, Japan
Abstract :
Isolation characteristics between transmitter and receiver ports for SAW antenna duplexer modules are studied in this paper. Two techniques for high isolation are presented. Optimized phase shifter conditions for SAW antenna duplexer modules at not 50 ohm cases have been analytically provided to achieve desired isolation performances. And switching circuit is proposed for high isolation characteristics. In order to confirm the prediction, obtained optimum phase condition and proposed circuit are applied to EGSM/DCS/ PCS triple band, SAW antenna duplexer modules.
Keywords :
isolation technology; radiotelephony; surface acoustic wave devices; wire antennas; EGSM/DCS/ PCS triple band; SAW antenna duplexer modules; SAW duplexer modules; high isolation techniques; optimized phase shifter conditions; optimum phase condition; receiver ports; switching circuit; transmitter ports; Distributed control; Equations; Impedance; Personal communication networks; Phase shifters; Power transmission lines; Reflection; Surface acoustic waves; Switching circuits; Transmitters;
Conference_Titel :
Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE
Print_ISBN :
0-7803-7582-3
DOI :
10.1109/ULTSYM.2002.1193363
