Ceramic Resonators Using BGS Waves

Abstract

The BGS wave has generally a large electromechanical coupling factor and a characteristic of complete reflection at stress-free edges of substrates. Therefore, a broad-band super-miniature resonator with a small capacitance ratio can be made utilizing the free-edge reflection property of a BGS wave. A BGS wave resonator using PZT was developed for use as a resonator for an additional trap at f as (adjacent sound carrier frequency) in VIF circuits of TV sets and VCRs. Testing as a trap device in VIF showed that this device has better properties than LC trap circuits.