Abstract

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.

Graduation Date

1996

Semester

Summer

Advisor

Christodoulou, Christos

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Electrical and Computer Engineering

Degree Program

Electrical Engineering

Format

PDF

Pages

112 p.

Language

English

Rights

Written permission granted by copyright holder to the University of Central Florida Libraries to digitize and distribute for nonprofit, educational purposes.

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Location

Orlando (Main) Campus

Identifier

DP0023930

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

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