Title :
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
fDate :
6/1/2008 12:00:00 AM
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;
Journal_Title :
Antennas and Propagation Magazine, IEEE
DOI :
10.1109/MAP.2008.4563567
