Intermediate-band crystal filter with low-transient response

Details Intermediate-band crystal filter with low-transient response Intermediate-band crystal filter with low-transient response

1976-05-17

1977-11-29

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 74, 333 78, H03H 704, H03H 708

Patent

active

040607763

ABSTRACT:
An intermediate-band, low-transient crystal filter utilizing standard components. The filter is characterized by improved response and temperature stability and a size which is smaller than presently used LC filters, helical filters and wide-band crystal filters. This is achieved by an unusual partitioning of a low-pass prototype ladder network which yields a cascade of symmetric lattice sections and, hence, a realizable crystal filter. The cascade is composed of only two fundamental sections.

REFERENCES:
patent: 2212840 (1940-08-01), Mason
patent: 3344369 (1967-09-01), Bies et al.
Herzog -- "Circuits Conditionally Equivalent to a Lattice Circuit," in Proc. IREE, Australia, July 1966; pp. 180-189.
Pond -- "Phased Matched Crystal Filters," Conference 1970 Wescon Technical Papers, vol. III, Western Electronic Show and Convention, Los Angeles, Calif. (25-28 Aug. 1970); pp. 1-6.

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