Title :
A 900 MHz ladder-type SAW filter duplexer
Author :
Weigel, R. ; Weigenthaler, K. ; Dill, R. ; Schropp, I.
Author_Institution :
Inst. fur Hochfrequenztech., Tech. Univ. Munchen, Germany
Abstract :
A low-cost hybrid-integrated SAW filter duplexer consisting of receiver top filter, transmitter final-stage filter and antenna terminal has been developed. The prototype design was oriented at the GSM system specifications in the 900 MHz-band. Three-stage ladder-type SAW filters have been designed to perform the duplexing function by the use of only one transmission line. The complete duplexer has an insertion loss of 1.2 dB in the Tx path (Tx) and 2.1 dB in the Rx path (Rx). The 3 dB-bandwidth is 40.1 MHz (Tx) and 47.4 MHz (Rx), respectively.
Keywords :
UHF filters; frequency division multiplexing; hybrid integrated circuits; ladder filters; land mobile radio; multiplexing equipment; surface acoustic wave filters; transceivers; 1.2 dB; 2.1 dB; 3 dB-bandwidth; 40.1 MHz; 47.4 MHz; 900 MHz; 900 MHz-band; FDD mobile radio transceivers; GSM system specifications; LiTaO/sub 3/; LiTaO/sub 3/ substrate; antenna terminal; frequency division duplexing; hybrid-integrated SAW filter duplexer; insertion loss; ladder-type SAW filter duplexer; receiver top filter; three-stage ladder-type SAW filters; transmission line; transmitter final-stage filter; Digital filters; Europe; Frequency; GSM; Insertion loss; Personal communication networks; Receiving antennas; SAW filters; Surface acoustic waves; Transmitters;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.508756
