A Simple EHF Hemispheric Coverage Antenna
Abstract
A circularly polarized, axially symmetric, wide-beam radiator is required in many applications, including TT&C for UAVs and satellites. This report discusses some existing wide-beam antenna designs including divergent lenses and reflectors and introduces a new antenna design. Using a simple dielectric ring in conjunction with a dielectric loaded circular waveguide opening, a near ideal, axially symmetric, hemispheric coverage antenna with circular polarization of good axial ratio and wide-band impedance match is realized. Mechanically, the antenna is small, lightweight, and low cost. The dielectric used is the common Rexolite. Since no lossy materials or resonant scatterers are used, the antenna performance is inherently broadband and low loss. A K sub a-band prototype as well as compact designs for both Q- and K-bands are described.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 08, 1994
- Accession Number
- ADA285078
Entities
People
- Joseph C. Lee
Organizations
- Massachusetts Institute of Technology