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oai:www.ideals.illinois.edu:2142/20714 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Underwood, Harold Roger 2011-05-07T12:47:12Z 2011-05-07T12:47:12Z 10000-01-01 1990 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. Made available in DSpace on 2011-05-07T12:47:12Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026339.pdf: 7252942 bytes, checksum: 23775bfb569746339065a115f760d76a (MD5) Previous issue date: 1990 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:45:46Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:20:21-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9026339 (UMI)AAI9026339 http://hdl.handle.net/2142/20714 eng Copyright 1990 Underwood, Harold Roger Engineering, Biomedical Engineering, Electronics and Electrical Physics, Electricity and Magnetism Rectangular microstrip radiator for a multielement local hyperthermia applicator text Electrical and Computer Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.