DocumentCode :
1395804
Title :
A Compact Tri-Band Monopole Antenna With Single-Cell Metamaterial Loading
Author :
Zhu, Jiang ; Antoniades, Marco A. ; Eleftheriades, George V.
Author_Institution :
Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada
Volume :
58
Issue :
4
fYear :
2010
fDate :
4/1/2010 12:00:00 AM
Firstpage :
1031
Lastpage :
1038
Abstract :
A compact tri-band planar monopole antenna is proposed that employs reactive loading and a ??defected?? ground-plane structure. The reactive loading of the monopole is inspired by transmission-line based metamaterials (TL-MTM), which enables the loaded antenna to operate in two modes. The first resonance exhibits a dipolar mode over the lower WiFi band of 2.40 GHz - 2.48 GHz, and the second resonance has a monopolar mode over the 5.15-5.80 GHz upper WiFi band. Full-wave analysis shows that the currents of the two modes are orthogonal to each other, resulting in orthogonal radiation patterns in the far field. The feature of a ??defected?? ground-plane, formed by appropriately cutting an L-shaped slot out of one of the CPW ground-planes, leads to the third resonance that covers the WiMAX band at 3.30-3.80 GHz. Air bridges at the intersection between the antenna and the CPW feedline ensure a balanced current. A fabricated prototype has compact dimensions of 20.0 mm ?? 23.5 mm ?? 1.59 mm, and exhibits good agreement between the measured and simulated S parameters and radiation patterns. The measured radiation efficiencies are 67.4% at 2.45 GHz, 86.3% at 3.50 GHz and 85.3% at 5.50 GHz.
Keywords :
S-parameters; antenna radiation patterns; broadband antennas; coplanar waveguides; defected ground structures; metamaterials; monopole antennas; multifrequency antennas; planar antennas; resonance; slot antennas; CPW feedline; CPW ground-planes; L-shaped slot antenna; S parameter; WiFi band; WiMAX band; compact tri-band planar monopole antenna; defected ground-plane structure; full-wave analysis; orthogonal radiation pattern; reactive loading; resonance; single-cell metamaterial loading; transmission-line based metamaterial; Antenna measurements; Antenna radiation patterns; Coplanar waveguides; Loaded antennas; Metamaterials; Pattern analysis; Resonance; Transmission lines; Transmitting antennas; WiMAX; Defected ground plane; folded monopole antenna; metamaterials; multiband antenna;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2010.2041317
Filename :
5398894
Link To Document :
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