A Compact Transmission-Line Metamaterial Antenna With Extended Bandwidth

Author

Zhu, Jiang ; Eleftheriades, George V.

Author_Institution

Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON

Volume

8

fYear

2009

fDate

7/1/1905 12:00:00 AM

Firstpage

295

Lastpage

298

Abstract

A wideband and compact planar antenna is proposed using a doubly resonant transmission-line metamaterial (TL-MTM) structure. The antenna consists of two TL-MTM arms that resonate at different frequencies. Each arm comprises a microstrip transmission-line loaded with five spiral inductors and is well matched to 50 Omega through an embedded series meandered line. Each arm is designed to work as a single antenna at its own resonant frequency, determined by the loading spiral inductance, where a zero insertion phase occurs. A wideband antenna matching is enabled when these two resonances suitably merge together. A fabricated prototype has dimensions of lambda_o/4 times lambda_o/7 times lambda_o/29, yielding a vertical linear electric field polarization, and provides a 100-MHz bandwidth (-10 dB) with a measured radiation efficiency of 65.8% at 3.30 GHz.

Keywords

broadband antennas; electromagnetic wave polarisation; metamaterials; microstrip antennas; planar antennas; spiral antennas; transmission lines; TL-MTM structure; compact planar antenna; doubly resonant transmission-line metamaterial; embedded series meandered line; frequency 100 MHz; linear electric field polarization; microstrip transmission-line; spiral inductors; wideband antenna; wideband antenna matching; Compact antennas; meandered line inductor; metamaterials; spiral inductor;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

Conference_Location

12/9/2008 12:00:00 AM

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2008.2010722

Filename

4703272