Analysis of circular patch antenna tuned by a ferrite post

A circular patch antenna tuned by a ferrite post is presented. The DC-biasing magnetic field is assumed perpendicular to the patch and the ferrite losses are taken into account. Both right- and left-hand circular polarizations are considered. The “perfect magnetic walls” approximation is employed and the resulting closed-form expressions can be used in the design of patch antennas. Also, this approximate but analytical study offers a clear physical insight with regard to the ferrite effects on the patch antenna's resonance characteristics. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 234–237, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20954