Aperture field transformation in resonant cavity antennas by transverse permittivity gradient superstrates

Raheel M. Hashmi, Karu P. Esselle

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

Abstract

Single-feed resonant cavity antennas (RCAs) with transverse permittivity gradient (TPG) superstrates exhibit very wideband directivity enhancement. In this paper, we study the transformation of transverse electric field that is achieved by the TPG superstrate. This provides physical insight into the operating principle of such RCAs. Two fictitious apertures are used to record and compare the phase of the field within the cavity of the RCA as well as above its TPG superstrate. It is found that the TPG superstrate significantly reduces the phase variation of the aperture field over most of the operating bandwidth, thus resulting in wideband directive characteristics. Numerical results as well as measurements are presented showing wideband antenna performance with a peak directivity exceeding 16 dBi.
Original languageEnglish
Title of host publication2017 32nd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)
Subtitle of host publicationproceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages997-999
Number of pages3
ISBN (Electronic)9789082598704
ISBN (Print)9781509044696
DOIs
Publication statusPublished - 2017
Event32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017 - Montreal, Canada
Duration: 19 Aug 201726 Aug 2017

Conference

Conference32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017
CountryCanada
CityMontreal
Period19/08/1726/08/17

Keywords

  • antenna feeds
  • antenna radiation patterns
  • broadband antennas
  • cavity resonators
  • microwave antennas
  • permittivity
  • RCA
  • TPG superstrate
  • aperture field transformation
  • single-feed resonant cavity antennas
  • transverse electric field
  • transverse permittivity gradient superstrates
  • wideband antenna performance
  • wideband directive characteristics
  • wideband directivity enhancement
  • Apertures
  • Broadband antennas
  • Cavity resonators
  • Directive antennas
  • Permittivity
  • Wideband

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