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Rectangular microstrip radiator for a multielement local hyperthermia applicator

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Title: Rectangular microstrip radiator for a multielement local hyperthermia applicator
Author(s): Underwood, Harold Roger
Department / Program: Electrical and Computer Engineering
Discipline: Electrical Engineering
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: Ph.D.
Genre: Dissertation
Subject(s): Engineering, Biomedical Engineering, Electronics and Electrical Physics, Electricity and Magnetism
Abstract: Advances in printed circuit technology facilitate the design of thin, conformable, microstrip patch antenna arrays. Such multielement microwave antenna arrays can be advantageous for controlled heating of superficial malignancies during cancer therapy. This thesis reports a theoretical analysis and design verification of the rectangular microstrip radiator for a hyperthermia applicator.Applicability of a cavity model approach for predicting near field patterns of a probe fed microstrip patch radiating in a lossy homogeneous medium is analyzed throughout a step-by-step development based on electromagnetic principles. A modal expansion technique and length correction factor slightly improve this model. Limitations of the simplifying assumptions and approximations in this model are tested by comparing numerical results of a single patch radiating in water with the measured results from an electric field probe. The measurement probe is an encapsulated miniature dipole designed for microwave transparent nonperturbing electric field measurement in biomedical media. Results show that safe and efficient performance of a microstrip patch as a biomedical radiator can be enhanced by a thin superstrate cover layer. Linear array patterns indicate that amplitude and phase variations can compensate for mutual coupling effects to adjust beam width and smoothness necessary in controlled hyperthermia heating.
Issue Date: 1990
Type: Text
Language: English
URI: http://hdl.handle.net/2142/20714
Rights Information: Copyright 1990 Underwood, Harold Roger
Date Available in IDEALS: 2011-05-07
Identifier in Online Catalog: AAI9026339
OCLC Identifier: (UMI)AAI9026339
 

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