Design of a Conformal Compact Overlapping Annular Slot Array
Abstract
Many omnidirectional antennas have and phase variation around azimuth when configured in an array due to scattering and coupling with neighboring elements. An array of cavity-backed annular slot antennas exhibits minimal scattering from adjacent elements due to the , but the diameter of the typical annular slot requires element spacing greater than a half-wavelength, resulting in grating lobes near the horizon when beamforming. A compact overlapping annular slot array is proposed for the purpose of minimizing gain and phase variation around azimuth while maintaining half-wavelength spacing at the highest operating frequency. The feed structures and radiating aperture for the proposed cavity backed slots are designed to eliminate unwanted current modes in order to preserve the desired radiation pattern. A conformal four-element compact overlapping annular slot array was designed, fabricated, and measured to validate the concept. Results show improved gain uniformity around azimuth at the horizon compared to conventional omnidirectional antenna arrays.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2020
- Accession Number
- AD1156976
Entities
People
- Eric D Robinson
- Ian T Mcmichael
Organizations
- MITRE Corporation