Accession Number : ADD011095

Title :   Tactical High Frequency Array Antennas.

Descriptive Note : Patent Application,


Personal Author(s) : Campbell,D V ; Dubowicz,P W ; Schwering,F K

Report Date : 27 Jun 1984

Pagination or Media Count : 32

Abstract : A vertically polarized array comprised of both bottom fed and top fed configurations having a driven element comprising at least one but, when desirable, two generally horizontal wire conductor segments of a length substantially equal to one half the operating wavelength of the array and with the ends of the half-wave conductor segments being connected to or extending into generally vertical quarter wavelength wire conductor segments. In a bottom fed configuration the feedpoint is at the bottom end of one vertical quarter wavelength conductor segment while in a top fed configuration one vertical quarter wavelength segment comprises a quarter wavelength of coaxial transmission line having one end configured into signal isolation means, comprising a cable choke, while the feedpoint is located at the other end. Behind the array, located at a distance of substantially a quarter wavelength, is a parasitic reflector element comprising a substantially identical structure as the driven element with the lower ends of the vertical quarter wavelength elements thereof positioned a foot or two above the surface of the ground. Such an arrangement provides unidirectional radiation and reception at low take-off angles, e.g, 20 deg above the horizon. (Author)

Descriptors :   *Patent applications, *Antenna arrays, *Broadband antennas, Frequency response, Tactical communications, High frequency

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE