HIGH GAIN WIDE BAND ACOUSTIC SURFACE WAVE TRANSDUCERS USING PARAMETRIC UPCONVERSION

摘要

Parametric upconverter acoustic surface wave transducer exhibiting high efficiency with wide band operation. The transducer consists of a combination of two constituent transducers, one a narrow bandwidth, high efficiency transducer and the other a wide bandwidth, low efficiency transducer, coupled to produce a resultant acoustic wave of a frequency equal to the sum of the frequencies of acoustic waves supplied by the low and high efficiency transducers. By properly selecting the center frequency of the low efficiency transducer relative to center frequency of the high efficiency transducer as well as the input electric power, the efficiency of the transducer of this invention may be made greater than the efficiency of the low efficiency transducer while retaining its wide bandwidth.