Surface Matching of Dielectric Lenses
- 1 April 1955
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 26 (4), 452-457
- https://doi.org/10.1063/1.1722017
Abstract
Two methods of cancelling the surface reflections of dielectric lenses are described in this paper. The first utilizes a simulated quarter‐wave matching layer, and the second a reactive wall embedded within the dielectric. The reactive wall may take a variety of physical forms, such as arrays of thin conducting disks which have a capacitive reactance, or arrays of thin wires which have an inductive reactance. Surface matching is obtained when the disks are placed approximately ⅜ wavelength inside the lens, or the wires ⅛ wavelength. Curves are presented that show how the reflections at the air and dielectric boundary are reduced for various angles of incidence and polarization when quarter‐wave layer and reactive‐wall matching are employed. The reactance of the array of disks for waves incident at various angles and polarizations is computed by means of Bethe's small aperture theory, and Babinet's principle. Measurements in wave guide of the reactance of an array of circular disks for various angles of incidence and for both E‐ and H‐plane polarization show close agreement with the theory.Keywords
This publication has 3 references indexed in Scilit:
- The Electric Polarizability of Apertures of Arbitrary ShapeProceedings of the IRE, 1952
- Microwave Coupling by Large AperturesProceedings of the IRE, 1952
- Determination of Aperture Parameters by Electrolytic-Tank MeasurementsProceedings of the IRE, 1951