Frequency selective limiting device

Details Frequency selective limiting device Frequency selective limiting device

1988-03-18

1989-07-04

Gensler, Paul

Wave transmission lines and networks

Automatically controlled systems

Limiting of amplitude

333 242, H01P 1218, H01P 123

Patent

active

048454397

ABSTRACT:
A frequency selective limiting device is described incorporating a plurality of individual attenuating units spaced apart from one another in substantially parallel relation and positioned between a pair of ground planes. Each individual attenuating unit is interposed between a pair of magnetic strips. In one embodiment of the invention, each individual attenuating unit includes a microstrip conductor positioned between a dielectric substrate layer and a layer of ferrite material. In an alternate embodiment of the invention, each individual attenuating unit includes a microstrip conductor positioned between a pair of planar ferrite members, the pair of ferrite members and microstrip conductor being mechanically supported by a dielectrical substrate layer. In both embodiments of the invention, adjacent attenuating units are serially connected by microstrip jumpers to provide a flow path for microwave signals passed through the limiting device. The plurality of ferrite members in association with the plurality of magnetic strips are operable to attenuate by a predetermined level a microwave signal above a preselected threshold power level passed through the limiting device.

REFERENCES:
patent: 3317863 (1967-05-01), Ngo
patent: 3534299 (1970-10-01), Eberhardt
patent: 4511865 (1985-04-01), Dixon, Jr.
patent: 4547754 (1985-10-01), Murakami et al.
"Frequency Selective Microwave Power Limiting in Thin YIG Films," IEEE Transactions on Magnetics, vol. MAG-19, No. 5, Sept. 1983, Steven N. Stitzer, pp. 1874-1876.
"A Multi-Octave Frequency Selective Limiter," 1983 IEEE MTT-S Digest, pp. 326-328, Steven N. Stitzer and Harry Goldie.
"Non-Linear Microwave Signal-Processing Devices Using Thin Ferrimagnetic Films," Circuits Systems Signal Process, vol. 4, No. 1-2, 1985, pp. 227-252 Steven N. Stitzer and Peter R. Emtage.

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