New phase-shifting technique for group-type unidirectional transducers used in surface-acoustic-wave filters
Abstract
A novel method of phase shifting useful in the group type of unidirectional transducers used for the design of low-loss SAW filters is reported. This technique utilizes the thin-film capacitance present between the newly described configuration of the feed-electrode layers as an essential element of the required phase shifter. The stray capacitance existing between the feed electrodes is used to advantage. The theoretical and experimental results of one of the filters fabricated are presented.
- Publication:
-
Electronics Letters
- Pub Date:
- March 1983
- DOI:
- 10.1049/el:19830117
- Bibcode:
- 1983ElL....19..168Y
- Keywords:
-
- Frequency Response;
- Insertion Loss;
- Phase Shift Circuits;
- Radio Filters;
- Surface Acoustic Wave Devices;
- Ultrasonic Wave Transducers;
- Capacitance;
- Electrical Impedance;
- Equivalent Circuits;
- Network Synthesis;
- Thin Films;
- Electronics and Electrical Engineering