Microstrip ring antennas have been experimentally tested by several researchers due to their specific radiation characteristics that make them very suitable for many applications, from medical uses to mobile communications. Ring antennas have been found to have a larger bandwidth compared to other conventional types of microstrip patch antennas. Further more, their size is smaller when compared to circular and rectangular resonant structures. The TM1m modes (m = 2,4,6 .. , where m represents radial variations) radiate conical beams in the broadside direction, while TM nl modes (n = 2,4,6 .. , where n represents azimuthal variations) have a radiation pattern with a null in the broadside direction but an omnidirectional azimuth coverage. Dual frequency behavior as well as improved bandwidth can be achieved by using stacked microstrip ring antennas. These are features that renders them useful for mobile communications, because by the appropriate selection of the radiation mode, azimuth and elevation beam steering can be obtained. The radiation characteristics and input impedance are studied for both the stacked and the single microstrip ring antennas. A Cavity Model Analysis is performed along with Green's Functions to predict results that are in good agreement with experimental data.
Master of Science (M.S.)
College of Engineering
Electrical and Computer Engineering
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Length of Campus-only Access
Masters Thesis (Open Access)
Orlando (Main) Campus
Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic
Rangel, Javier Gomez Tagle, "Cavity model analysis of microstrip ring antennas using green's functions" (1996). Retrospective Theses and Dissertations. 3055.