Radiation of High-Gain Cavity-Backed Slot Antennas Through a Two-Layer Superstrate

Author

Tan, Weihua ; Shen, Zhongxiang ; Shao, ZhenHai

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

Volume

50

Issue

3

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

78

Lastpage

87

Abstract

The radiation of cavity-backed slot (CBS) antennas through a two-layer superstrate is studied in this paper. A novel transmission-line model is proposed to explain the gain-enhancement effect of the superstrate on cavity-backed slot antennas. Experimental result showed that a single cavity-backed slot antenna can achieve a high gain of 16.7 dBi through a properly designed superstrate, and this gain-enhancement property is valid for array configurations, as well. A rotationally arranged four-slot array, covered by the superstrate, is also investigated, to demonstrate that good circular polarization and high gain can be obtained from the superstrate-covered slot antennas.

Keywords

directive antennas; electromagnetic wave polarisation; slot antenna arrays; array configurations; circular polarization; gain-enhancement effect; high-gain cavity-backed slot antennas; transmission-line model; two-layer superstrate; Antenna arrays; Dipole antennas; Directive antennas; Magnetic materials; Mutual coupling; Periodic structures; Phased arrays; Photonic crystals; Polarization; Slot antennas;

fLanguage

English

Journal_Title

Antennas and Propagation Magazine, IEEE

Publisher

ieee

ISSN

1045-9243

Type

jour

DOI

10.1109/MAP.2008.4563567

Filename

4563567