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SINGLE-MODE DIELECTRIC WAVEGUIDE

  • US 3,659,916 A
  • Filed: 07/28/1970
  • Issued: 05/02/1972
  • Est. Priority Date: 07/28/1970
  • Status: Expired due to Term
First Claim
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1. A waveguide for guiding electromagnetic wave energy comprising:

  • an elongated, low-loss dielectric guiding strip, having a refractive index n and an essentially rectangular cross section, embedded in a low-loss dielectric substrate of lower refractive index;

    said substrate contacting the two narrow surfaces and one of the wide surfaces of said strip; and

    a high admittance material having a refractive index whose magnitude is larger than the refractive index of said strip contacting the other wide surface of said strip;

    characterized in that;

    the narrow dimension t and the wide dimension w of said strip are given by and where the refractive index of the portion of substrate in contact with said narrow surfaces is n(1 - Delta '"'"''"'"'), the refractive index Of the portion of substrate in contact with said one wide surface is n(1 - Delta ), and lambda is the free space wavelength of said wave energy.

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