Title :
New band-switching SAW antenna duplexer used in 800-MHz Japanese cdmaOne systems
Author :
Hikita, M. ; Sakiyama, K. ; Kijima, M. ; Hikino, O.
Author_Institution :
Central Res. Lab., Hitachi Ltd., Japan
Abstract :
Japanese 800-MHz cdmaOne systems have not only reverse frequency allocations for the transmitted and received frequency bands, but also the very wide frequency bandwidth of 38 MHz for each band and the narrow frequency spacing of 17 MHz between two bands. We have developed a new band-switching SAW antenna duplexer for these systems. Each of the transmitter-line and receiver-line filter consists of a wide-band SAW bandpass filter and an SAW band-rejection filter of which rejection band can be shifted by switching circuits corresponding to low (L) and high (H) bands. The duplexer module size is as small as 10×8×2 mm3 and the required specifications for cdmaOne were satisfied
Keywords :
UHF antennas; antenna accessories; band-pass filters; band-stop filters; cellular radio; code division multiple access; surface acoustic wave filters; switching circuits; 800 MHz; Japanese cdmaOne system; SAW band-rejection filter; band-switching SAW antenna duplexer; cellular telephone; frequency allocation; frequency bandwidth; frequency spacing; mobile communication; receiver-line filter; switching circuit; transmitter-line filter; wideband SAW bandpass filter; Band pass filters; Bandwidth; Frequency; Multiaccess communication; Radio spectrum management; Receiving antennas; Surface acoustic waves; Transmitters; Transmitting antennas; Wideband;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.922578
