Integratable microwave devices based on ferromagnetic films disposed on dielectric substrates
AssigneeRaytheon Company
InventorErnst F. R. A. Schloemann
Life of this patent
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Abstract
Integratable microwave devices such as a tuneable band reject filter or an r.f. switch are provided on a gallium arsenide substrate having a (100) orientation. Each of the devices includes a layer of a ferromagnetic material having a pair of easy axes which lie in the plane of said (100) orientated substrate and a layer of a conductive, nonmagnetic material disposed thereover. The ferromagnetic material has a ferromagnetic resonant frequency related to the applied DC magnetic field, the anisotropy field, the saturation magnetization, and gyromagnetic ratio. Such devices are provided by utilizing the ferromagnetic resonant properties of the ferromagnetic material disposed on the (100) substrate.
Claims22
A microwave circuit element, comprising:
- a dielectric substrate;
- a ground plane conductor disposed over a first surface of said substrate;
- a patterned composite strip conductor disposed over a second opposing surface said substrate, said patterned composite strip conductor, comprising:
- a first layer comprising a magnetic material disposed on said substrate and having a pair of easy axes disposed in the plane of said second opposing surface of said substrate;
- a second layer of a conductive nonmagnetic material, disposed over said layer of magnetic material;
- means for providing a magnetic field parallel to at least a portion of said pattern composite strip conductor;
- and
- wherein said patterned, composite conductor is disposed parallel to one of the easy axis of said magnetic material.
A band reject filter, comprising:
- a substrate comprised of GaAs having a (100) orientated surface;
- a patterned composite strip conductor disposed on said (100) orientated surface comprising:
- a first layer of a crystalline ferromagnetic material having a pair of easy axis which lie in the plane of said (100) orientated surface;
- a second layer disposed on said first layer, comprising a conductive, nonmagnetic material with said second layer and first layers patterned such that said patterned composite strip conductor has a dimension parallel to one of said easy axes of said first layer of ferromagnetic material.
An r.f. switch, comprising:
- a substrate comprised of GaAs having a (100) orientated surface;
- a patterned composite strip conductor disposed over said (100) orientated surface, comprising:
- a first layer comprised of a magnetic material having a pair of easy axes which lie in the plane of said (100) orientated surface, said layer having first and second patterned portions which have a common terminus and are disposed orthogonal to one another in the common plane of said (100) surface, said first and second patterned portions being further disposed parallel to respective ones of said easy axes of said magnetic material;
- a second layer comprising a conductive, nonmagnetic material disposed on said first layer, said second layer having first and second mutually orthogonal portions having a common terminus and disposed over said respect first and second patterned portion of said first layer, and a third portion connected with the common terminus of said first and second portions of said second layer, with said third portion of said second layer being disposed on said substrate.
Dependencies are inferred from the claim text.