Element reduction in phased arrays using dual-mode self-scanning elements

Author

Shafai, L. ; Ragheb, Hassan A.

Author_Institution

Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada

Volume

17

Issue

3

fYear

1992

fDate

7/1/1992 12:00:00 AM

Firstpage

98

Lastpage

106

Abstract

A method for reducing the number of elements in phased arrays that uses dual-mode array elements such as horns or microstrip patches is introduced. It is shown that the excitation of the second mode can be used to locate preferentially a null on the element radiation pattern. In particular, when the null is moved to the array grating lobe location, it causes its cancellation and permits selection of large interelement spacings. The number of array elements can therefore be reduced. The method is then applied to both triangular and rectangular lattice structures having uniform or tapered excitation. It is found that the method can reduce the number of elements by as much as 26% for the triangular lattice and by 45% for the rectangular lattice.

Keywords

antenna phased arrays; antenna radiation patterns; waveguide antennas; array elements; array grating lobe location; dual-mode self-scanning elements; element radiation pattern; element reduction; horns; interelement spacings; microstrip patches; null; phased arrays; rectangular lattice structures; second mode excitation; tapered excitation; triangular lattice structures; uniform excitation; Antenna radiation patterns; Apertures; Arrays; Gratings; Lattices; Phased arrays;

fLanguage

English

Journal_Title

Electrical and Computer Engineering, Canadian Journal of

Publisher

ieee

ISSN

0840-8688

Type

jour

DOI

10.1109/CJECE.1992.6594365

Filename

6594365