Asymmetric Coplanar Waveguide (ACPW) Zeroth-Order Resonant (ZOR) Antenna With High Efficiency and Bandwidth Enhancement

Author

Chen, Po-Wei ; Chen, Fu-Chiarng

Author_Institution

Dept. of Electr. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

11

fYear

2012

fDate

7/4/1905 12:00:00 AM

Firstpage

527

Lastpage

530

Abstract

A novel low-profile zeroth-order (ZOR) antenna is presented. The feature of ZOR based on periodic structures is employed to reduce the antenna size, while these antennas generally suffer from narrow bandwidth. A single-layer asymmetric coplanar waveguide (ACPW) structure is proposed to realize a bandwidth-extended ZOR antenna, where the antenna bandwidth is characterized by an equivalent circuit model. The ACPW structure not only provides the design freedom, but also overcomes the design constraint of the traditional CPW. The ACPW ZOR antenna is verified by both full-wave simulations and experiments. As an advantage of the proposed method, the size of antenna is reduced, and the resonant frequency of zeroth-order mode is 1.94 GHz with radiation efficiency of 85%, measured 10-dB fractional bandwidth up to 10.3%, and omnidirectional peak gain of 2.3 dBi.

Keywords

UHF antennas; coplanar waveguide components; equivalent circuits; ACPW; ZOR; bandwidth enhancement; equivalent circuit model; frequency 1.94 GHz; full-wave simulations; gain 10 dB; omnidirectional peak gain; periodic structures; single-layer asymmetric coplanar waveguide structure; zeroth-order mode; zeroth-order resonant antenna; Antenna measurements; Antennas; Bandwidth; Coplanar waveguides; Frequency measurement; Gain; Resonant frequency; Composite right/left-handed transmission line (CRLH-TL); coplanar waveguide (CPW); zeroth-order resonant (ZOR) antenna;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2012.2198191

Filename

6196169