H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/58
H03H 9/64 (2006.01) H03H 9/02 (2006.01)
Patent
CA 1191911
ABSTRACT OF THE DISCLOSURE A compensation scheme is disclosed which avoids the require- ment of high alignment accuracy, and thus reduces the production cost of a surface acoustic wave filter, by employing a compensa- ting transducer system which is arranged with its fingers paral- lel to those of the receiving transducer. The requirement of receiver sensitivity at the trap frequencies is nevertheless achieved by using a very narrow compensating beam width. The narrowness of the compensating beam also allows it to pass directly through a multi-strip coupler. The degree of compensa- tion achieved is controlled by aiming the compensating beam at a small region of the apodized receiving transducer located at the extremity of the major lobe; by restricting the aperture of the compensating transducer system; and by trimming the printed cir- cuit capacitor which couples the compensating transducer system to the electrical input signal. The degree of compensation achieved is made to differ at the upper and lower trap fre- quencies by using a compound compensating transducer system em- ploying two individual transducers spaced apart the proper distance to be more or less in phase opposition to each other at one of the trap frequencies. The individual transducers neverthe- less remain largely in phase with each other at the other trap frequency, so as to aid each other in producing the compensation effect.
423742
Macrae & Co.
Zenith Radio Corporation
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