In-line surface acoustic wave filter assembly module and method

Details In-line surface acoustic wave filter assembly module and method In-line surface acoustic wave filter assembly module and method

1981-02-27

1982-12-21

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333154, 333194, 29 2535, H03H 964, H03H 905, H03H 925

Patent

active

043652190

ABSTRACT:
A SAW filter assembly module comprising a plurality of series in-line SAW filter devices and effective to provide substantial isolation of output from input of the module. Separate isolated conductive ground areas are applied to the surface of an insulative substrate upon which the SAW filter devices are placed with a portion of certain areas extending to a terminal side of the substrate and each SAW device is electrically connected to a respective conductive ground area. A separate inter-SAW ground area is provided between each set of device ground areas. A conductive input area of a first SAW filter is located most distant from the conductive output area of a subsequent SAW filter with the plurality of conductive ground areas located therebetween to increase selectivity. A conductive shield is secured to and electrically connected to a ground area between the SAW filter devices and is positioned to block radiative signals between the devices. A shunt inductor is connected between the inter-SAW ground area and in inter-SAW signal path conductive area to increase selectivity with low insertion loss. Bent wire straps, of flat or other essentially non-cylindrical cross-section may be used to make electrical connections between the electrodes of the transducers of each SAW to the appropriate respective conductive areas of the substrate. An insulative cover is positioned over the filter assembly module with portions of the conductive areas extending thereunder toward the terminal side of the substrate.

REFERENCES:
patent: 3573673 (1971-04-01), De Vries et al.
patent: 3688223 (1972-08-01), Pratt et al.
patent: 3828210 (1974-08-01), Livenick et al.
patent: 3872331 (1975-03-01), Falco
patent: 4044321 (1977-08-01), Vasile
patent: 4126839 (1978-11-01), Yamanoi et al.

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