Title :
SAW antenna duplexer module using SAW-resonator-coupled filter for PCN system
Author :
Shibagaki, Nobuhiko ; Sakiyama, Kazuyuki ; Hikita, Mitusutaka
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
Surface Acoustic Wave (SAW) filters has been widely applied to radio personal communication to reduce size and volume of the radio terminals. In this paper, we discuss the application of SAW filters used in 1.8-GHz band antenna duplexer module for Personal Communications Network (PCN) systems. The module consisting of a receiver top filter (R1), a transmitter final stage filter (T1), lumped matching-circuit elements and lumped phase-shift circuits has been developed. The duplexer module has an insertion loss of less than 1.6 dB (1710-1785 MHz) in the Tx-to-antenna path and of less than 3.3 dB (1805-1880 MHz) in the antenna-to-Rx path, respectively. It also has a size of 14×8×1.8 mm and a weight of 0.4 g, which achieved about one-fifth reduction compared with the conventional dielectric-resonator filter duplexers
Keywords :
UHF antennas; UHF filters; antenna accessories; personal communication networks; surface acoustic wave resonator filters; 1.8 GHz; PCN system; SAW-resonator-coupled filter; antenna duplexer module; insertion loss; lumped matching-circuit elements; lumped phase-shift circuits; personal communications network; radio personal communication; receiver top filter; transmitter final stage filter; Acoustic waves; Circuits; Dielectrics; Insertion loss; Matched filters; Personal communication networks; Radio transmitters; Receivers; SAW filters; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.762092
