A Simple EHF Hemispheric Coverage Antenna
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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A circularly polarized, axially symmetric, wide-beam radiator is required in many applications, including TTC 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.
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation