Contribution to the analysis of small microstrip patch antennas

Abstract

In this thesis, three compact microstrip antennas based on the defected microstrip (DMS) and the shorting post insertion techniques are developed. The first is a single-band operating in the radar 3 GHz frequency. It achieves a miniaturization ratio of around 77 % compared to a conventional rectangular structure. The second is a dual-band monopole covering UHF radio frequency identification bands. A size reduction of nearly 44 % is achieved compared to a reported structure. The third is a multi-band antenna operating in six frequency bands suitable for different applications involving commercial ones. A size reduction of nearly 60 % with respect to the original antenna has been obtained. Prototypes of the proposed antennas have been fabricated and their input reflection coefficients