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Optimum probes for near-field antenna measurements on a planeHuddleston, G. K. (Gene Keith) 08 1900 (has links)
No description available.
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Microwave beam shaping using the principle of images applied to cylindrical reflectorsHutchison, Paul Trice 08 1900 (has links)
No description available.
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Pulse radiation from an insulated antenna : an analogue of Cherenkov radiation from a moving chargeHertel, Thorsten W. 12 1900 (has links)
No description available.
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Analysis of uniform and stepped coplanar strips structures including constant width slot antennasOfosu, Willie Kenneth January 1994 (has links)
No description available.
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Investigation of parabolic reflector antennas as single- and multi-phase centre virtual antennasAllahgholi Pour, Zahra 13 January 2012 (has links)
In this thesis, the concept of multi-phase centre virtual antenna is thoroughly investigated when a dual-mode primary feed is placed at the focal point of an offset reflector antenna. The virtual antenna requires that the antenna have multiple phase centre locations with identical radiation patterns. It is shown that different polarizations and mode content factors of a dual-mode circular waveguide can displace the phase centre location of an offset reflector antenna without changing its radiation patterns in any direction. This novel idea has promising applications in modern satellite, remote sensing, global positioning systems, and radars with moving platform. The concept is well matched for the modern Displaced Phase Centre Antenna technique, in which a simple signal processing technique is employed to electronically displace the phase centre locations. To avoid mechanically rotating the primary feed, a novel dual-mode feed is also proposed and implemented. It is capable of generating two perpendicular polarized TE11 modes with a fixed aligned TE21 mode. The antenna such developed has a potential application as a transceiver in ground moving target indicator radars. All numerical results are successfully validated by fabricating and testing a prototype antenna in practice.
As known, an offset reflector fed by a conventional linear polarized feed suffers from high cross polarization level. This property is also investigated for single-phase centre antenna applications along with sidelobe level and aperture efficiencies. A simplified feed model is proposed utilizing the TE11 and TE21 type modes to reduce the cross polarization at both asymmetry and inter-cardinal planes. It is shown that an asymmetric dominant TE11 mode with the presence of the TE21 mode is sufficient in order to reduce the unwanted cross polarization. The results of this investigation are used to design practical dual-mode feeds using simple circular waveguide geometries. To complete the study, the effects of linear and quadratic phase errors associated with the optimized primary feed are also investigated on the cross polarization of the offset reflector antennas. In particular, the phase errors resulting in separate phase centre locations of each mode produce broadside-shape cross polarized patterns instead of boresight-null ones.
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Low-cost microstrip line-based ferrite phase shifterHui, William W. G January 2006 (has links)
Thesis (M.S.)--University of Hawaii at Manoa, 2006. / Includes bibliographical references (leaves 73). / xii, 73 leaves, bound ill. (some col.) 29 cm
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Adaptive update rate target tracking for a phased array radar /Sarunic, Peter. Unknown Date (has links)
Thesis (ME)--University of South Australia, 1995
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The computer-aided design of rectangular microstrip antennas / by Noel Maxwell MartinMartin, Noel Maxwell January 1984 (has links)
Some mounted ill. / 1 v. (various pagings) : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 1985
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Substrate supported metal strip antennas for monolithically fabricated millimetre wavelength arrays /Parfitt, Andrew J. January 1992 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 1993? / Includes bibliographical references (leaves 219-227).
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Broadside and endfire antennas associated with diffracting partitions in navigation /Tran, Van Nguyen. January 1973 (has links) (PDF)
Thesis (Ph.D.) from the Dept. of Electrical Engineering, University of Adelaide, 1974.
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