Title :
An integrated SAW antenna duplexer for EGSM/DCS1800/PCS triple-band cellular systems
Author :
Shibagaki, Nobuhiko ; MatSuura, Naoki ; Sakiyama, Kazuyuki ; Hikita, Mitsutaka
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
New surface acoustic wave (SAW) antenna duplexer used in EGSM/DCS1800/PCS triple-band cellular phones has been developed. Unique configurations to achieve miniaturization are demonstrated. Direct-parallel connection between the EGSM receiver SAW filter and the transmitter diode switch, and direct-parallel connection between the DCS and PCS receiver SAW filters make it possible to reduce the number of circuit elements and to achieve a small module size. We also realize balance-mode output capability at receiver port with unbalance-balance transformation circuit on the module. The measurement procedure, balance-mode frequency characteristics for receiver path and unbalance-mode frequency characteristics for transmitter path are also presented
Keywords :
cellular radio; digital radio; personal communication networks; surface acoustic wave devices; 1.8 GHz; EGSM/DCS1800/PCS triple-band cellular systems; balance-mode frequency characteristics; balance-mode output capability; circuit elements; direct-parallel connection; integrated SAW antenna duplexer; miniaturization; module size; receiver path; transmitter diode switch; transmitter path; unbalance-balance transformation circuit; Acoustic waves; Cellular phones; Circuits; Diodes; Frequency; Personal communication networks; SAW filters; Surface acoustic waves; Switches; Transmitters;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.922580
