Title :
A 900 MHz SAW microstrip antenna-duplexer for mobile radio
Author :
Anemogiannis, K. ; Beck, C. ; Roth, A. ; Russer, P. ; Weigel, R.
Author_Institution :
Siemens Corp. Res. & Dev. Muenchen, West Germany
Abstract :
A novel, 900-MHz SAW (surface acoustic wave) microstrip antenna-duplexer designed for use in European mobile radio systems is presented. The duplexer consists of a transmitter SAW filter, two receiver SAW filters, a low-noise receiver amplifier, and a duplexing microstrip circuit. A dual-track filter design using interdigital transducers for track coupling provides low insertion loss (5 dB), small passband ripple (+or-0.5 dB), high stopband rejection (50 dB), and small chip-size (TO-39 package). The filters were fabricated on 36 degrees -rotated YX-LiTaO/sub 3/ substrates with a photolithographic technique. Due to the design of the microstrip duplexer, the selectivity of the front end is enhanced by 15 dB.<>
Keywords :
microstrip antennas; mobile radio systems; multiplexing equipment; surface acoustic wave filters; 36 degrees -rotated YX-LiTaO/sub 3/ substrates; 5 dB; 900 MHz; European mobile radio systems; LiTaO/sub 3/; SAW microstrip antenna-duplexer; TO-39 package; UHF; dual-track filter design; duplexing microstrip circuit; high stopband rejection; interdigital transducers; low insertion loss; low-noise receiver amplifier; microstrip duplexer; mobile radio; photolithographic technique; receiver SAW filters; selectivity; small chip-size; small passband ripple; track coupling; transmitter SAW filter; Acoustic waves; Land mobile radio; Low-noise amplifiers; Microstrip antennas; Microstrip filters; Mobile antennas; Radio transmitters; Receivers; SAW filters; Surface acoustic waves;
Conference_Titel :
Microwave Symposium Digest, 1990., IEEE MTT-S International
Conference_Location :
Dallas, TX
DOI :
10.1109/MWSYM.1990.99681
