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US 4,283,692 AGranted
Magnetostatic wave signal-to-noise-enhancer
AssigneeWestinghouse Electric Corp.
InventorJohn D. Adam
Life of this patent
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Abstract
A magnetostatic wave device having a microstrip transmission line in conjunction with a YIG thin film biased for magnetostatic wave operation at a level where relatively lower power input microwave signals are highly attenuated up to a critical point past which the relative attenuation is greatly reduced. Such devices may be utilized as signal-to-noise enhancers in microwave circuits such as frequency memory loops.
Claims10
A magnetostatic wave signal-to-noise enhancer comprising:
- (a) a magnetostatic wave supporting material;
- (b) a microwave transmission line, having first and second ends, and being contiguous said material to launch magnetostatic waves thereinto;
- (c) input means coupled to one end of said transmission line for applying an input signal within an operating frequency range;
- (d) output means coupled to the other end of said transmission line;
- (e) magnetic means biasing said material for magnetostatic wave operation wherein at relatively low power levels of input signal, launched magnetostatic waves remove power from said transmission line resulting in attenuation of said signal and
- past a certain critical input signal power level said power removed by said magnetostatic waves is reduced relative to said input signal power, resulting in a relative reduction of said attenuation;
- and
- (f) means for preventing launched magnetostatic waves from reflecting from the edges of said thin film material back to said transmission line.
5 more elements
Dependencies are inferred from the claim text.