Accession Number : ADP001114

Title :   A Wire-Grid Design of a UHF Antenna,


Personal Author(s) : Sohel,M. S. ; Picard,T. G.

Report Date : JAN 1983

Pagination or Media Count : 23

Abstract : Cavity-backed flush mounted annular slot antennas can be employed in place of the conventionally used blade antennas for UHF communication applications. The slot antennas are large in size, fabricated from metal, and the slot installation weighs more than a blade antenna installation. Previously, Kraus proposed that a flat metal disc can be simulated with four quarter-wave long metal wires intersecting at right angles to each other at the center. However, no further data or investigations are available in the literature. In this study, an attempt is made to simulate the whole antenna (disc and cavity) with grids of metal wires etched on a fiberglass mold of the antenna. The antenna was tuned for a VSWR of 2:1 from 225-400 MHz, and the antenna gain and radiation patterns were recorded at 225, 330, and 400 MHz frequencies.

Descriptors :   *Slot antennas, *Cavity resonators, *Grids, *Electric wire, *Aircraft antennas, Communication equipment, Antenna radiation patterns, Right angles, Ultrahigh frequency, Radiation patterns, Gain, Fiberglass, Molds(Forms), Wire, Slots, Installation, Metals, Blades, Symposia, Antennas

Distribution Statement : APPROVED FOR PUBLIC RELEASE