Title :
A compact and low-profile metamaterial ring antenna with vertical polarization
Author :
Qureshi, Fahad ; Antoniades, Marco A. ; Eleftheriades, George V.
Author_Institution :
Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Ont., Canada
fDate :
6/27/1905 12:00:00 AM
Abstract :
A compact (λ0/11 footprint) and low-profile (λ0/28 height) metamaterial ring antenna is proposed using two metamaterial unit cells. Each constituent unit cell consists of negative-refractive-index (NRI) microstrip transmission lines (TL) designed to incur a zero insertion phase at the antenna design frequency. This allows the inductive posts to ground, which act as the main radiating elements, to be fed in phase. Hence, the antenna operates as two closely spaced monopoles that are fed in phase through a compact feed network. An embedded matching network ensures good VSWR performance. The theoretical performance of the antenna is verified by full-wave simulations and experimental data obtained from a fabricated prototype at 1.77 GHz. The antenna offers a 120 MHz -10 dB bandwidth and a measured efficiency exceeding 50%.
Keywords :
antenna radiation patterns; metamaterials; microstrip antennas; microwave antennas; monopole antennas; polarisation; refractive index; transmission lines; -10 dB; 1.77 GHz; 120 MHz; antenna design frequency; full-wave simulations; metamaterial ring antenna; mon; negative-refractive index microstrip transmission line; prototype fabrication; radiating elements; unit cells; vertical polarization; zero insertion phase; Antenna feeds; Antenna theory; Bandwidth; Frequency; Metamaterials; Microstrip antennas; Polarization; Transmission line antennas; Transmission line theory; Virtual prototyping; Metamaterials; negative refractive index; small antennas; vertical polarization;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2005.857041
