Surface wave filters with coupled resonators

Details Surface wave filters with coupled resonators Surface wave filters with coupled resonators

H - Electricity

03

H

333/58

H03H 9/30 (2006.01) H03H 9/64 (2006.01)

Patent

CA 1060962

Abstract of the Disclosure Electrical filters of L-C type are limited to low frequencies because their Q factor is poor at high frequencies. Monolithic crystal filters of known type have high Q factors but are difficult to manufacture for high frequencies because they must then be made very thin. The invention disclosed provides an electrical filter with substantially square band-pass characteristics at higher frequencies than can be obtained with monolithic crystal filters. The filter comprises a body of piezoelectric material on one surface of which is arranged a plurality of acoustic surface wave resonators having substantially the same centre frequency. An input transducer is arranged to launch acoustic surface wave energy responsive to an input signal into a first resonator for exciting an acoustic surface standing wave therein. An output transducer is arranged to receive acoustic surface wave energy from a second resonator for providing an output signal. Successive resonators are coupled together for transferring acoustic surface wave energy from one resonator to the next.

243313

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