Characteristics of single- and double-layer microstrip square-ring antennas

Author

Bafrooei, Pedram Moosavi ; Shafai, Lotfollah

Author_Institution

Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada

Volume

47

Issue

10

fYear

1999

fDate

10/1/1999 12:00:00 AM

Firstpage

1633

Lastpage

1639

Abstract

A method for miniaturization of microstrip patch antennas without degrading radiation characteristics is investigated. It involves perforating the patch to form a microstrip square-ring antenna, which is investigated numerically and experimentally. The ring geometry introduces additional parameters to the antenna that can be used to control its impedance, resonance frequency, and bandwidth. For a single square ring increasing the size of perforation increases its input impedance, but decreases the resonance frequency and bandwidth. It has a small effect on directivity of the antenna. To match the antenna to a transmission line and also enhance its bandwidth, the ring is stacked by a square patch or another square ring. The computed results are compared with experimental data and again good agreement is obtained

Keywords

antenna radiation patterns; directive antennas; impedance matching; microstrip antennas; bandwidth; directivity; double-layer microstrip square-ring antennas; impedance; miniaturization; patch antennas; perforation; radiation characteristics; resonance frequency; ring geometry; single-layer microstrip square-ring antennas; transmission line; Antenna measurements; Bandwidth; Dielectric resonator antennas; Geometry; Impedance; Microstrip antennas; Patch antennas; Resonance; Resonant frequency; Solids;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.805910

Filename

805910