Microwave ferrite resonator with parallel permanent magnet bias
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United States of America Patent
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Oct 14, 1997
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Apr 24, 1996
filing date -
Apr 24, 1996
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Abstract
A magnetic structure for a ferrite-based electromagnetic resonator comprises a toroidal permanent magnet which surrounds high permeability material forming a gap in which there is for example a YIG sphere which is tunably resonant in a magnetic field. The high permeability material also forms part of a magnetic circuit. A main electromagnetic coil, preferably a solenoid, surrounds the permanent magnetic structure and the high permeability material, and a modulation coil, also preferably in the form of a toroid, also surrounds the gap in the magnetic circuit.
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