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oai:www.ideals.illinois.edu:2142/20861 2023-07-10 col_2142_5131 com_2142_5130

text Mittra, Raj Kouki, Ammar Ben Brahim 2011-05-07T12:51:26Z 2011-05-07T12:51:26Z 10000-01-01 1991 The spectral domain method is applied to four different problems involving microwave and millimeter-wave circuits. First, a general spectral domain formulation of the problem of electromagnetic coupling through apertures in a planar conducting screen is presented. This method is validated by analyzing resonant slots and comparing the results to previously published findings. Second, a class of slotted guiding structures is analyzed with a mixed spectral domain approach derived from the original aperture coupling formulation. The dispersion characteristics of several practical slotted structures are presented. Third, the discontinuity and radiation effects of a thin slot in the ground plane of a microstrip line are analyzed using the spectral domain approach. The scattering parameters of the slot are computed and compared to measured results. An equivalent circuit model of the slot discontinuity at low frequencies is also developed. Fourth, the spurious radiation and scattering from arbitrarily shaped microstrip etches are analyzed using the spectral domain method. A parametric study is carried out to identify the worst-case scenario for radiation. Next, the numerical aspects of the implementation of the spectral domain technique are discussed. Algorithms for handling the numerical difficulties associated with the presence of singularities, oscillations and infinite integration limits are presented. Finally, conclusions from the study are presented and suggestions and recommendations for future research topics are made. Made available in DSpace on 2011-05-07T12:51:26Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9210877.pdf: 6534813 bytes, checksum: 6106cbd04a96a720c9e8fa430fb4520c (MD5) Previous issue date: 1991 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:46:48Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:21:03-05:00 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 AAI9210877 (UMI)AAI9210877 http://hdl.handle.net/2142/20861 eng Copyright 1991 Kouki, Ammar Ben Brahim Engineering, Electronics and Electrical Application of the spectral domain technique to discontinuity and spurious radiation problems in microwave circuits Engineering, Electronics and Electrical Engineering, Electronics and Electrical University of Illinois at Urbana-Champaign Dissertation Ph.D.