Title :
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
fDate :
10/1/1999 12:00:00 AM
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;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
