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Mayes, Paul E. Smith, Hugh Kennedy 2011-05-07T13:05:16Z 2011-05-07T13:05:16Z 10000-01-01 1991 This thesis describes techniques for bandwidth enhancement for low-profile antennas. The first method involves the use of coupled resonators. In particular, two cavity-backed slot antennas are coupled through an aperture in a common wall. One cavity-backed slot antenna, of the coupled antenna system, is driven. This coupled antenna system is analyzed using two different approaches. The first approach employs the cavity-model theory in conjunction with a variational procedure. Both experimental and theoretical results are presented and there is good agreement between the two. The second approach in the analysis of the coupled cavity-backed slot antenna used the boundary-integral method. This method, which was previously introduced for the analysis of planar microwave circuits, has been extended to the analysis of thin microwave antennas. The results from the boundary-integral method compare reasonably well with with the measured data. The boundary-integral method is also used to predict the performance of various microstrip antennas. These microstrip patch antennas, in general, can have arbitrary perimeters, load slots, and shorting pins. Both theoretical and experimental results are given. The coupled-resonator approach is shown to produce greater than two-fold increases in operating bandwidth. For even wider bandwidths a second method is demonstrated. This second method uses a log-periodic array of dual-feed microstrip patch antennas. Experimental results are provided for this array. Made available in DSpace on 2011-05-07T13:05:16Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124491.pdf: 4085500 bytes, checksum: c1c4b318799a62883ec0b38c140d0104 (MD5) Previous issue date: 1991 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:49:59Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:22:47-05:00 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 AAI9124491 (UMI)AAI9124491 http://hdl.handle.net/2142/21322 eng Copyright 1991 Smith, Hugh Kennedy Engineering, Electronics and Electrical Bandwidth enhancement techniques for low-profile antennas: Theory and experiment text Electrical and Computer Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.