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dc.contributor.author Mousavi Bafrooei, Seyed Pedram en_US
dc.date.accessioned 2007-05-15T15:29:24Z
dc.date.available 2007-05-15T15:29:24Z
dc.date.issued 1997-08-01T00:00:00Z en_US
dc.identifier.uri http://hdl.handle.net/1993/1117
dc.description.abstract In this thesis a method for miniaturisation of a microstrip patch antenna without degrading its 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 no effect on directivity of the antenna. A novel transmission-line model is also developed to predict the resonance frequency of a single layer ring antenna. The results of this model show good agreement with those generated by Ensemble software. With the help of the transmission-line model the possibility of using a single stub to decrease the resonance frequency of the patch is also investigated. 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. en_US
dc.format.extent 4290058 bytes
dc.format.extent 184 bytes
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.language en en_US
dc.language.iso en_US
dc.title Characteristics and design of microstrip square ring antennas en_US
dc.degree.discipline Electrical and Computer Engineering en_US
dc.degree.level Master of Science (M.Sc.) en_US


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