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Wide band microwave isolators

  • US 4,152,677 A
  • Filed: 07/26/1978
  • Issued: 05/01/1979
  • Est. Priority Date: 03/10/1976
  • Status: Expired due to Term
First Claim
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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:

  • 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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