Small aperture evanescent-mode waveguide antenna matched using distributed coupled resonators

P. Ludlow, V. Fusco, G. Goussetis, D.E. Zelenchuk

Research output: Contribution to journalArticle

Abstract

Presented is a design methodology which permits the application of distributed coupled resonator bandpass filter principles to form wideband small-aperture evanescent-mode waveguide antenna designs. This approach permits matching of the complex antenna aperture admittance of an evanescent-mode open-ended waveguide to a real impedance generator, and thereby to a coaxial feed probe. A simulated reflection coefficient of < - 10 dB was obtained over a bandwidth of 20%, from 2.0-2.45 GHz, in a 2.58 GHz cutoff waveguide. Dielectric-filled propagating waveguide and air-filled evanescent-mode waveguide sections are used to form the resonators/coupling elements of the antenna's coupled resonator matching sections. Simulated realised gain variation from 3.4-5.0 dBi is observed across the bandwidth. The antenna's maximum aperture dimension is < 0.47 wavelength at the upper operating frequency and so it is suitable for use in a wide angle scanning phased array.
Original languageEnglish
Pages (from-to)580-582
JournalElectronics Letters
Volume49
Issue number9
DOIs
Publication statusPublished - 25 Apr 2013

Keywords

  • antenna coupled resonator matching sections
  • wide angle scanning phased array
  • distributed coupled resonator bandpass filter principles
  • bandwidth 2.0 GHz to 2.45 GHz
  • wideband small-aperture evanescent-mode waveguide antenna designs
  • complex antenna aperture admittance
  • dielectric-filled propagating waveguide
  • real impedance generator
  • evanescent-mode open-ended waveguide
  • resonator-coupling elements
  • air-filled evanescent-mode waveguide sections
  • coaxial feed probe

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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