Reactance filter having an improved edge steepness

Details Reactance filter having an improved edge steepness Reactance filter having an improved edge steepness

2006-10-24

2006-10-24

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C333S187000, C333S189000

Reexamination Certificate

active

07126253

ABSTRACT:
A reactance filter, which is constructed from BAW resonators, has at least one basic element that has a first resonator in a first branch and a second resonator in a second branch. In one branch, there is situated a resonator having a greater ratio of dynamic to static capacitance than in the second branch, so that a filter is obtained having a resulting passband in which one edge is set steeper than the other edge. The selection of the edge that is to be set steeply takes place through the allocation of the first branch to the serial or to the parallel branch.

REFERENCES:
patent: 6246302 (2001-06-01), Müller et al.
patent: 196 38 451 (1998-04-01), None
patent: 55-127719 (1980-10-01), None
patent: 55-127720 (1980-10-01), None
Abstract of JP 63 253711 (Oct. 20, 1988)Patent Abstracts of Japanvol. 013, No. 068 (E-716), Feb. 16, 1989.
Lakin et al “Development of Miniature Filters for Wireless Applications”,Microwave Symposium Digest, IEEE MTT-S International 1995,pp. 883-886.

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