Title :
Application of SAW devices to matching elements in RF circuits
Author :
Hashimoto, Ken-Ya ; Omori, Tatsuya ; Yamaguchi, Masatsune
Author_Institution :
Dept. of Electron. & Mech. Eng., Chiba Univ., Japan
Abstract :
This paper discusses the application of SAW devices to impedance matching elements in RF circuits. First, the application of L-type cell consisting of two SAW resonators is discussed. It is shown that the properly designed L-type cell enables perfect impedance matching with capacitive loads. However, passband width and/or insertion loss become a trade-off with the impedance matching. The result suggests that this matching function could be installed in ladder-type SAW filters consisting of the cascade-connected L-type cells. Secondly, the application of double-mode SAW (DMS) filters is discussed. The DMS filters also exhibit the impedance matching function although their performance is more sensitive to capacitive loads than that of the L-type cell.
Keywords :
impedance matching; ladder filters; radiofrequency integrated circuits; surface acoustic wave resonator filters; surface acoustic wave resonators; RF circuits; SAW devices; SAW resonators; capacitive loads; cascade connected L-type cells; double mode SAW filters; impedance matching elements; insertion loss; ladder type SAW filters; passband width; radio frequency circuits; surface acoustic wave devices; Capacitance; Equivalent circuits; Impedance matching; Inductors; Insertion loss; Matched filters; Passband; Radio frequency; Surface acoustic wave devices; Surface acoustic waves;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293433
