Title :
Design methodology and experimental results for new ladder-type SAW resonator coupled filters
Author :
Hikita, Mitsutaka ; Shibagaki, Nobuhiko ; Sakiyama, Kazuyuki ; Hasegawa, Kouichi
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
fDate :
7/1/1995 12:00:00 AM
Abstract :
Design methodology and experimental results for a new type of SAW filter called an "extended SAW resonator coupled filter" used in 800 MHz and 0.6 to 1.0 watt cellular radios are presented. The new filters have very small nonlinearities as well as high-performance and high-power characteristics. We have proposed a new equivalent circuit model for IDTs with leaky SAWs, which includes the propagation losses due to leakage and conductances caused by bulkwave radiation. Synthesis procedures for the new SAW filters based on the new treatments of leaky SAWs are discussed, and simulation and experimental results are also given. The new filters satisfy not only the required frequency-response specifications but also the spurious response sensitivity for an antenna duplexer used in USA cellular radio.<>
Keywords :
equivalent circuits; ladder filters; surface acoustic wave resonator filters; 0.6 to 1.0 W; 800 MHz; IDTs; USA cellular radio; antenna duplexer; bulkwave radiation; conductance; design methodology; equivalent circuit; extended SAW resonator coupled filter; frequency-response; ladder-type filters; leaky SAWs; nonlinearities; propagation losses; simulation; spurious response sensitivity; synthesis; Circuit simulation; Circuit synthesis; Coupling circuits; Design methodology; Equivalent circuits; Land mobile radio cellular systems; Propagation losses; Resonator filters; SAW filters; Surface acoustic waves;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
