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

fYear

1993

fDate

31 Oct-3 Nov 1993

Firstpage

15

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1993. Proceedings., IEEE 1993

Conference_Location

Baltimore, MD

Print_ISBN

0-7803-2012-3

Type

conf

DOI

10.1109/ULTSYM.1993.339709

Filename

339709