Electrical frequency filter comprising piezoelectric crystals

Details Electrical frequency filter comprising piezoelectric crystals Electrical frequency filter comprising piezoelectric crystals

1978-07-19

1980-05-27

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333190, H03H 926, H03H 932

Patent

active

042052840

ABSTRACT:
The invention relates to electrical filters comprising piezoelectric crystals.
When very considerable variations in slope are required in the transmission curve of filters of this type, it is necessary to use a plurality of crystals having very different equivalent self-inductances, some of which are impossible to obtain. The invention overcomes these limitations by using only crystals (X'.sub.1, X'.sub.2, X'.sub.3 . . . X'.sub.7) having feasible self-inductances and by establishing the desired self-inductances by using transformers such as T.sub.3.
The filters according to the invention may be used in particular for the same applications as JAUMANN-type filters in telephone communications.

REFERENCES:
patent: 2097458 (1937-11-01), Hansell
patent: 4060776 (1977-11-01), Blinchikoff

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