Wide band microwave isolators
First Claim
1. An elongate wide band microwave device utilizing non-reciprocal surface modes propagating in a direct direction along the long dimension of the device comprising:
- an all magnetic direct propagation medium including;
a conducting strip for effecting at its opposite ends the conversion of the TEM propagation mode into the non-reciprocal TE surface propagation mode and vice-versa;
two gyromagnetic slabs parallel to and located on opposite sides of said strip so as to propagate the TE surface mode energy in the direct direction;
two absorbent loads respectively disposed in the planes of and alongside each slab on each side of said strip, a first load being made of a unitary slab extending along the whole long dimension of the device for damping the surface wave propagating in the reverse direction, and the second load comprising a plurality of smaller bars placed side by side along the long dimension for damping unwanted propagation modes compatible with slabs and strip dimensions;
means affording electrical connection to opposite ends of said strip;
two ground planes, positioned on opposite sides of said propagation medium respectively; and
means for establishing a magnetic field through said medium in a plane perpendicular to said strip.
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Abstract
In a surface wave isolator consisting of two gyromagnetic slabs a conductive strip between said slabs, means to establish a magnetizing field within said slabs, a two part load is associated side by side with said slabs and the strip extends also between the two parts of the load. A first part of the load is a continuous load parallel to the strip, a second part of the load is a plurality of localized absorbing means placed along the propagation axis and parallel to said strip. The impedance of the localized absorbing means is matched to the impedance of an unwanted parasitic propagation mode at the corresponding place.
7 Citations
8 Claims
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1. An elongate wide band microwave device utilizing non-reciprocal surface modes propagating in a direct direction along the long dimension of the device comprising:
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an all magnetic direct propagation medium including;
a conducting strip for effecting at its opposite ends the conversion of the TEM propagation mode into the non-reciprocal TE surface propagation mode and vice-versa;
two gyromagnetic slabs parallel to and located on opposite sides of said strip so as to propagate the TE surface mode energy in the direct direction;two absorbent loads respectively disposed in the planes of and alongside each slab on each side of said strip, a first load being made of a unitary slab extending along the whole long dimension of the device for damping the surface wave propagating in the reverse direction, and the second load comprising a plurality of smaller bars placed side by side along the long dimension for damping unwanted propagation modes compatible with slabs and strip dimensions;
means affording electrical connection to opposite ends of said strip;
two ground planes, positioned on opposite sides of said propagation medium respectively; and
means for establishing a magnetic field through said medium in a plane perpendicular to said strip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification