Title :
Design methodology and synthesis techniques for ladder-type SAW resonator coupled filters
Author :
Hikita, Masayuki ; Shibagaki, N. ; Akagi, T. ; Sakiyama, Kazuo
Author_Institution :
Central Res. Lab., Hitachi Ltd., Kokubunji
fDate :
31 Oct-3 Nov 1993
Abstract :
New types of SAW filter called “extended SAW resonator coupled filter” have been developed for 800-MHz and 0.6 to 1.0 W cellular-radio pocket phones. They have not only high-performance and high-power characteristics but also very small 3rd-order nonlinearities. We investigated a new equivalent circuit for IDTs with leaky SAWs. This circuit includes propagation losses due to leakage and conductance caused by bulkwave radiation. Design and synthesis procedures for the new SAW filters based on new treatments of leaky SAWs are discussed. Simulation and experimental results are also given for the frequency characteristics of the filters used in an antenna duplexer of USA cellular radio
Keywords :
acoustic resonators; cellular radio; equivalent circuits; ladder networks; piezoelectric transducers; surface acoustic wave filters; ultrasonic transducers; 0.8 to 1 W; 800 MHz; IDTs; USA cellular radio; antenna duplexer; cellular phone; design; equivalent circuit; extended SAW resonator coupled filter; frequency characteristics; ladder-type SAW resonator coupled filters; leaky SAWs; propagation losses; synthesis; Circuit simulation; Circuit synthesis; Coupling circuits; Design methodology; Equivalent circuits; Frequency; Propagation losses; Resonator filters; SAW filters; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1993. Proceedings., IEEE 1993
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1993.339709
