Title :
High frequency STW resonator filters
Author :
Almar, R. ; Horine, B. ; Andersen, J.
Author_Institution :
Sawtek Inc., Orlando, FL, USA
Abstract :
The authors present results obtained in the 1-GHz-2-GHz region for surface transverse wave (STW) resonator filters implemented using inline coupled (RFI) and combined mode resonator filter (CMRF) techniques. The STW device performance is strongly dependent on the surface confinement of the acoustic wave. In an inline resonator filter the inner grating serves the dual purpose of trapping the energy near the surface and providing the proper coupling between the two ports, making the periodicity of the inner grating a more critical parameter than in a combined mode device. Results show the effect of changing the periodicity of the inner grating on the overall response of the RFIs. The performance of combined mode resonator filters at 1 and 2 GHz is reviewed. Phase noise measurements for the 1-GHz CMRF device are presented, and the effect of changing the metal thickness on the overall device performance is demonstrated
Keywords :
acoustic microwave devices; acoustic resonators; crystal resonators; microwave filters; surface acoustic wave filters; 1 to 2 GHz; RFI; acoustic wave; combined mode resonator filter techniques; coupling; device performance; high frequency STW resonator filters; inline coupled techniques; inline resonator filter; inner grating; metal thickness; periodicity; phase noise measurements; surface confinement; surface transverse wave; Acoustic waves; Gratings; Noise measurement; Phase measurement; Phase noise; Radiofrequency interference; Resonant frequency; Resonator filters; Surface acoustic wave devices; Thickness measurement;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.276065
