Date of Award

Spring 2001

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)


Electrical and Computer Engineering

First Advisor

Richie, James E.

Second Advisor

Ishii, Thomas K.

Third Advisor



An electrically small loop antenna generally has poor performance which is characterized by poor radiation efficiency and small input resistance. When the geometry of the loop varies, the performance of the loop can be changed. The platform on which the loop is mounted also has significant effect on the performance of the loop. In this thesis, different types of loops with similar dimension were analyzed to determine the effects of the geometry on the performance of the loops. A cylinder platform was also simulated to analyze the effects on the performance of the loops when the loops were mounted on the cylinder. A method of moments computer code was used to simulate the different antenna types on infinite ground plane and cylinder platform over the frequency band of 2MHz to 12MHz in order to understand the effects at this frequency range. The radiation efficiency and input impedance of the loops were analyzed across the band of interest. It was found that changing geometry only made a little difference of the loop performance on ground plane. The cylinder platform coupled with the loops and the coupling current radiated power. The radiation efficiency and input resistance increased significantly with the effects of the cylinder. A switched loop antenna was simulated. The switch-resistance was found to have serious effect on the radiation efficiency of the loop.



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