A Single-Feed, High-Gain, Circularly Polarized S-Band Antenna and Its Test Coupler

Abstract

unicationsCircular polarizationThe development of a single-feed, high-gain, circularly polarized 'cup-dipole' antenna, operated over the frequency band of 2.24-2.25 GHz, and its test coupler is described. The antenna consists of a turnstile feed of crossed dipoles of unequal lengths, backed by a cup cavity. With a cup size of 1.33 wavelength in diameter, it produces a gain of 12.7 dB when matched to a VSWR of 1.1. This corresponds to an effective receiving area 6% larger than the physical area. An even higher gain of 13.4 DB, or an aperture efficiency of 122.5%, is observed when the antenna is flush- mounted on a large plate. The radiation pattern shows that the antenna has a half-power breamwidth of approximately 40 degrees and an axial ratio of < or = 0.5 dB over the angular region of plus or minus 10 degrees off boresight.

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Document Details

Document Type
Technical Report
Publication Date
Jul 05, 1973
Accession Number
AD0769907

Entities

People

  • Kuo-chun Lang

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Antenna Configurations
  • Antennas
  • Artificial Satellites
  • Boresights
  • Circuits
  • Coaxial Cables
  • Communication Satellites
  • Construction
  • Equivalent Circuits
  • Frequency Bands
  • High Gain
  • Radiation
  • Radiation Patterns
  • Reflectors
  • Standards

Fields of Study

  • Physics

Readers

  • Phased Array Antenna Design.