Scanned directivity of linear arrays

Author

Langston, L.

Author_Institution

General Dynamics Corp., Fort Worth, TX, USA

Volume

19

Issue

2

fYear

1971

fDate

3/1/1971 12:00:00 AM

Firstpage

282

Lastpage

284

Abstract

Expressions for directivity as a function of spacing, scan angle, and current distribution are presented for uniformly spaced linear arrays subject to the assumption that the element radiation intensity function of each radiator can be expressed in either of the following forms: $(1 - \\sin^{2} \\theta \\cos^{2} \\Phi )^{P}$ or $\\sin^{2P} \\theta \\sin^{2Q} \\Phi$ where $P$ and $Q$ are zero or positive integers. By proper choice of $P$ and $Q$ , these expressions can be used to approximate the element radiation intensity function associated with a linear array of isotropic radiators, parallel short dipoles, collinear short dipoles, and planar equiangular spiral antennas. Analytical results are given for a number of cases, and graphical results are presented for directivity in the direction of scan angle for a linear array of radiators with a uniform current distribution and an element radiation intensity given by the expression $\\sin^{2} \\theta \\sin^{2} \\Phi$ in the region $y \\geq 0$ and zero in the region $y < 0$ .

Keywords

Linear arrays; Antenna measurements; Antennas and propagation; Current distribution; Dipole antennas; Directive antennas; Goniometers; Linear antenna arrays; Spirals;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1971.1139918

Filename

1139918