H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/58
H03H 9/64 (2006.01) H03H 17/02 (2006.01)
Patent
CA 1168322
PHB 32 697 18 ABSTRACT: A surface acoustic wave bandpass electrical filter consists of input and output interdigital trans- ducers (IP, OP) with an interposed track changing multi- strip array (MSA). A conventional broadband array (MSA) is divided into two sub-groups of strips with respect to a centre of symmetry (C) separated by different distances along the input track (T1) and the output track (T2) such that the amplitude-frequency response of the array (MSA) has a stopband centred on a predetermined frequency. If the input and output transducers (IP,OP) both have a double electrode configuration, electrode separation .lambda.o/4, providing a fundamental passband at a corresponding fre- quency fo and an equal amplitude passband at the third harmonic 3fo, then a separation difference of .lambda.o/6 between the sub-groups of the array (MSA) in the two tracks (T1,T2) can suppress the third harmonic passband in the filter output. The multistrip coupler may instead be divided into three sub-groups. The sub-groups of the multistrip array may be further sub-divided to suppress more than one frequency. Also a multistrip array arranged in groups to provide a shaped bandpass response may have each group divided into sub-groups to suppress a selected harmonic passband of the array.
370700
Mitchell Richard F.
Murray Robert J.
Schofield John
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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