Attenuation of higher order width modes in magnetostatic wave devices
AssigneeWestinghouse Electric Corp.
InventorJohn D. Adam
Life of this patent
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Abstract
A magnetostatic wave device is described incorporating a plurality of resistive strips spaced apart from one another and transverse to the propagation path of magnetostatic waves in a material such as a YIG film having a finite width for attenuating selected higher order modes of propagating magnetostatic waves.
Claims17
A magnetostatic wave device operable with microwave signals and operable within a biasing magnetic field, comprising:
- material suitable for propagating magnetostatic waves in a first direction and having a finite width transverse to said first direction;
- a first and second transducer located in spaced apart relationship in association with said material for generating and receiving magnetostatic waves along a propagation path therebetween in said first direction;
- and
- a plurality of resistive strips spaced apart from one another and positioned above said material and transverse to said propagation path for attenuating selected modes of propagating magnetostatic waves occurring due to said finite width of said material.
A mode filter for attenuating selected higher order modes in a magnetostatic wave device utilizing a suitable material for propagating magnetostatic waves along a path comprising:
- a plurality of resistive strips spaced apart from one another and positioned on said material transverse to said path.
Apparatus for delaying microwave signals comprising:
- a substrate of gadolinium gallium garnet having a first surface;
- a film of yttrium iron garnet deposited on said first surface;
- first means for generating magnetostatic waves in said film in response to said microwave signals;
- second means for converting magnetostatic waves propagating in said film to microwave signals;
- and, third means for attenuating magnetostatic waves of higher order modes traveling transverse to the direction between said first and second means.
Dependencies are inferred from the claim text.