Title :
Miniature SAW antenna duplexer for 800-MHz portable telephone used in cellular radio systems
Author :
Hikita, Mitsuka ; Ishida, Yuuki ; Tabuchi, Toyoji ; Kurosawa, Kazuhito
Author_Institution :
Hitachi Ltd., Tokyo, Japan
fDate :
6/1/1988 12:00:00 AM
Abstract :
A description is given of a low-loss, high-power surface acoustic wave (SAW) filter developed for an antenna duplexer used in an 800-MHz portable telephone transceiver. The ladder-type configuration uses SAW resonators and capacitors between electrode fingers and ground. The device is fabricated on a 20-mm-square LiTaO3 chip. This configuration provides insertion loss as low as 1.0-1.2 dB and output power up to 2 W at 800 MHz. Experimental results from a miniature antenna duplexer-module using this SAW filter as a transmitter filter and previously published high-performance SAW filters as receiver filters are also presented and compared
Keywords :
antenna accessories; cellular radio; crystal filters; passive filters; radiofrequency filters; radiotelephony; surface acoustic wave devices; telephone equipment; transceivers; 1.0 to 1.2 dB; 2 W; 800 MHz; LiTaO3; RF filters; SAW antenna duplexer; SAW filters; SAW resonators; UHF; capacitors; cellular radio systems; high-power; insertion loss; ladder-type configuration; low-loss; miniature type; mobile radio systems; output power; portable telephone; radiotelephony; surface acoustic wave; telephone transceiver; Acoustic waves; Capacitors; Electrodes; Fingers; Resonator filters; SAW filters; Surface acoustic wave devices; Surface acoustic waves; Telephony; Transceivers;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
