Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1985-06-03
1986-07-15
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333 241, 333235, 333246, H01P 1218, H01P 700
Patent
active
046009060
ABSTRACT:
A magnetically tuned resonant circuit for coupling r.f. energy between input and output coupling circuits thereof in a first mode of operation and isolating such energy between such coupling circuits in a second mode of operation includes a current path circuit provided to selectively change the resonant frequency of the magnetically tuned resonant circuit. In a first embodiment of the current path circuit, a microstrip transmission line used to form one of such coupling circuits, having a pair of planar spaced strip conductor portions adjacent a resonant body, is configured to provide the current path around such body. In the presence of an external magnetic field H.sub.DC, a pulse of current is fed around the current path and in response thereto provides a pulse magnetic field H.sub.DCp in the region of the resonant body. Such field H.sub.DCp either aids or opposes the external magnetic field H.sub.DC and in response thereto shifts a resonant frequency .omega..sub.o of such circuit in accordance with the equation .omega..sub.o =.gamma.(H.sub.DC .+-.H.sub.DCp) where .gamma. is a quantity known as the gyromagnetic ratio. In an alternate embodiment of the circuit, the circuit includes a coil supported on a dielectric substrate to provide the current path, with such coil being disposed adjacent the resonant body. A pulse of current is fed to the coil providing a magnetic field H.sub.DCp, and in the presence of the external magnetic field H.sub.DC, the resonant frequency of such circuit is shifted in accordance with the equation .omega..sub.o =.gamma.(H.sub.DC .+-.H.sub.DCp).
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"Magnetically-Tunable Microwave Filters Using Single-Crystal Yttrium-Iron-Garnet Resonators" by Philip S. Carter, IRE Transactions on Microwave Theory and Techniques, May 1961.
Gensler Paul
Maloney Denis G.
Raytheon Company
Sharkansky Richard M.
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