Folded cross grid dipole antenna element

Details Folded cross grid dipole antenna element Folded cross grid dipole antenna element

1991-11-18

1994-03-08

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343807, H01Q 2126

Patent

active

052931765

ABSTRACT:
A wide bandwidth, wide scan, antenna array element provides an active element impedance close to 350 ohms over a bandwidth approaching one octave in a periodic equilateral triangular array lattice. The two balanced feed inputs to each element may be phased to produce any desired polarization. The interelement spacing is the maximum possible for grating lobe free operation. This antenna element combines features of a crossed grid dipole with a folded dipole. The antenna structure consists of conductors lying in two planes which are parallel to a ground plane. These are joined by a limited number of perpendicular conductors. The VSWR remains below 2:1 in a 300 or 350 ohm system for scan in any direction out to 30 degrees off of broadside over a bandwidth approaching one octave.

REFERENCES:
patent: 3196443 (1965-07-01), Martin
patent: 3273158 (1966-09-01), Fouts et al.
patent: 4758843 (1988-07-01), Agrawal et al.
patent: 4922263 (1990-05-01), Dubost et al.
patent: 5075691 (1991-12-01), Garay et al.
Ayzenberg, Shortwave Antennas, State Publishing House for Literature on Questions of Communications and Radio, Moscow 1962.
Antenna Theory Analysis and Design, C. Balanis, West Virginia University, pp. 330-332.
Antenna Engineering Handbook Second Edition, R. Johnson et al., pp. 4-12 to 4-18, 28-10 to 28-11 and 20-17 to 20-21.
Modern Antenna Design, T. Milligan, Martin Marietta Denver Aerospace, pp. 340-346.

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