Design of a circular polarized nearly square microstrip patch antenna with offset feed

Sin Keng Lee, A. Sambell, E. Korolkiewicz, Shirt Fun Ooi, Yi Qin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Citations (Scopus)


This paper presents the design of a circular polarized nearly square patch antenna using an offset microstrip feed. By using an offset feed instead of the normal corner feed, it is shown that the area of the perturbation segment must increase in order to maintain circular polarization. Consequently, the effect of manufacturing errors on the axial ratio is reduced. Using a fixed offset feed position the dimensions of the antenna are uniquely obtained. The antenna is matched using a simple matching network consisting of a short length of a microstrip line. A matched antenna was designed to operate at 2.45 GHz and an axial ratio of <0.5 dB and the return loss of >20 dB was obtained experimentally. The predicted, simulated and practical results are shown to be in good agreement.

Original languageEnglish
Title of host publicationHigh Frequency Postgraduate Student Colloquium, 2004 Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Print)0780384261
Publication statusPublished - 30 Nov 2004
Externally publishedYes
Event2004 High Frequency Postgraduate Student Colloquium - Manchester, United Kingdom
Duration: 6 Sep 20047 Sep 2004

Publication series

NameIEEE High Frequency Postgraduate Student Colloquium
ISSN (Print)1546-6523
ISSN (Electronic)1558-4607


Conference2004 High Frequency Postgraduate Student Colloquium
Country/TerritoryUnited Kingdom

Cite this