Filter chain

Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network

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310 82, 310 98, 333 72, H03H 926, H03H 714, H04R 1700

Patent

active

039835189

ABSTRACT:
Filter chain comprising a number of monolithic units of piezoelectric material, which units vibrate according to the thickness shear mode and are provided with at least two acoustically coupled resonators and are coupled electrically one to another. The acoustic coupling between said resonators is equal for all units, whereas the electric coupling impedances between the units are substantially ohmic. Due to this the pass band of the filter is determined by the acoustic couplings and there is no need for an adjustment of the electric coupling between the units.

REFERENCES:
patent: 3585537 (1971-06-01), Rennick et al.
patent: 3624564 (1971-11-01), Ise et al.
patent: 3633134 (1972-01-01), Barrows et al.
patent: 3676806 (1972-07-01), Orchard et al.
patent: 3727154 (1973-04-01), Dailing et al.
Smythe "Communications Systems Benefit from Monolithic Crystal Filters" in Electronics, Jan. 31, 1972; pp. 48-51.

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