Surface acoustic wave ring filter
Abstract
A new geometry for SAW filters has been developed consisting of four 90 degree reflecting gratings at the corners of a rectangular propagation path. This ring filter geometry provides bandwidths of up to 2% with an insertion loss under 3 dB and out-of-band rejection of over 60 dB. Results are presented showing filter responses of devices built on lithium niobate with gratings consisting of aluminum lines, aluminum lines between ion-etched grooves, and depth-weighted ion-etched grooves, and devices built on ST-cut quartz with gratings consisting of gold lines recessed in ion-etched grooves.
- Publication:
-
30th Annual Frequency Control Symposium
- Pub Date:
- 1976
- Bibcode:
- 1976frco.symp..334S
- Keywords:
-
- Bandpass Filters;
- Gratings (Spectra);
- Insertion Loss;
- Lithium Niobates;
- Radio Filters;
- Surface Acoustic Wave Devices;
- Bandwidth;
- Etching;
- Frequency Response;
- Ion Impact;
- Quartz Crystals;
- Electronics and Electrical Engineering