Title :
Extended new-type SAW-resonator-coupled filters used in duplexer for Japanese cellular radio
Author :
Hikita, Masayuki ; Tabuchi, T. ; Shibagaki, N. ; Akagi, T.
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
Cellular mobile radio operates in full duplex mode, e.g. simultaneously transmits and receives radio frequency signals. A duplexer is constructed with a transmitter final stage filter (T1) and a receiver top filter (R1). New SAW filters using an extended SAW-resonator-coupled structure have been developed for Japanese cellular radio. A low loss of 1.6 dB for T1 and a high rejection level of 50 dB for R1 have been achieved.
Keywords :
cellular radio; crystal resonators; radio equipment; surface acoustic wave filters; 1.6 dB; Japanese cellular radio; SAW-resonator-coupled filters; duplexer; full duplex mode; high rejection level; low loss; receiver top filter; transmitter final stage filter;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19921318
