Title :
COM analysis for LSAW filters
Author :
Malocha, S. ; Abbott, B.P. ; Saldanha, N. ; Bayram, A. ; Girard, P.-A.
Author_Institution :
Triquint Semicond., Apopka, FL
Abstract :
This paper presents a modified COM - based analysis for LSAW ladder and coupled resonator filters. The acoustic sources between the adjacent elements (transducers and gratings) are taken into account by using a gap-type cell instead of a traditional electrode-type cell. Mutual capacitances between the elements are calculated from an electrostatic analysis. The Y-matrix of the device is obtained by a combination of P-matrix cascading and the circuit analysis. The presented analysis is applied to the devices with chirped and apodized elements. A good agreement between calculated and experimental results is demonstrated.
Keywords :
acoustoelectric devices; electrostatics; ladder filters; matrix algebra; surface acoustic wave resonator filters; LSAW ladder filter; P-matrix; Y-matrix; acoustic source; apodized element; chirped element; circuit analysis; coupled resonator filter; electro-acoustic interaction; electrostatic analysis; gap-type cell; modified COM-based analysis; mutual capacitance; Acoustic devices; Acoustic transducers; Capacitance; Circuit analysis; Digital filters; Electrodes; Electrostatics; Gratings; Resonator filters; Voltage; COM; LSAW; RF filters;
Conference_Titel :
Ultrasonics Symposium, 2008. IUS 2008. IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2428-3
Electronic_ISBN :
978-1-4244-2480-1
DOI :
10.1109/ULTSYM.2008.0477
