Title

Matching Of Single-Phase Unidirectional Saw Transducers And A Demonstration Using A Low-Loss Ewc/Spudt Filter

Abstract

The authors present the theoretical criterion for calculating the electrical port load required for matching a SPUDT (single-phase unidirectional transducer) and an efficient procedure for tuning a SPUDT filter. The theoretical development identifies a potentially useful class of SPUDTs that requires no matching network to achieve a high degree of triple transit cancellation. The sensitivity of the SPUDT filter's insertion loss to parasitic resistance is explained. It is found that the insertion loss of a SPUDT can increase as the thickness of the metallic overlay is increased (contrary to conventional surface acoustic wave technologies). The process of matching a SPUDT filter is demonstrated using a 196 MHz filter packaged in an 18-pin DIP package and matched with miniature internal coils. A triple transit suppression of 55 dB was obtained for an insertion loss of 8.6 dB.

Publication Date

12-1-1990

Publication Title

Ultrasonics Symposium Proceedings

Volume

1

Number of Pages

49-54

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

0025576122 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0025576122

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