A class of notched omnidirectional antennas

Author

Koffman, Irwin ; Lopez, Alfred R.

Author_Institution

Wheeler Laboratories Inc., Smithtown, NY, USA

Volume

15

Issue

3

fYear

1967

fDate

5/1/1967 12:00:00 AM

Firstpage

352

Lastpage

356

Abstract

A class of antennas featuring a steerable notch in an otherwise omnidirectional pattern is described. This type of antenna presents an alternative to a narrow beam antenna for certain applications; it is attractive when a small antenna capable of $360\\deg$ pattern rotation is desirable. The notch characteristic is obtained by combining in a single antenna three basic modes of radiation. One mode is omnidirectional, the other two are figure-8 patterns that are crossed in space. By controlling the amplitude and phase of these radiation modes, a family of patterns exhibiting different notch characteristics may be realized. The notch can be steered a full $360\\deg$ in azimuth by a single phase-shifter. An experimental model of a notch-omnidirectional antenna has been fabricated and tested at X-band. Notch pattern synthesis and rotation techniques have been demonstrated.

Keywords

Conical reflector antennas; Reflector antennas, conical; Azimuth; Cardiology; Coaxial components; Directional antennas; Directive antennas; Feeds; Navigation; Receiving antennas; Shape control; Testing;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1967.1138935

Filename

1138935