DRA_Torino2007_Presentation_090607b

DRA_Torino2007_Presentation_090607b - University of Houston...

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ICEEA '07 -- Sept 20, 2007 0 The History of the Development of the Dielectric Resonator Antenna Stuart A. Long and Ellen M. O’Connor Department of Electrical and Computer Engineering University of Houston, Houston, TX 77204-4005 University of University of Houston Houston
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ICEEA '07 -- Sept 20, 2007 1 Outline University of University of Houston Houston Origins of idea Simple theoretical model Early experimental data Initial journal papers More recent DRA research at the University of Houston Worldwide locations of DRA activity
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ICEEA '07 -- Sept 20, 2007 2 Early Development of microstrip antennas at the University of Houston Work on circular patch microstrip antennas University of University of Houston Houston Professor Liang Shen, 1983
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ICEEA '07 -- Sept 20, 2007 3 Supported by US Army Research Office Interest in very rugged radiators for artillery shells University of University of Houston Houston 2) Early Development of microstrip antennas at the University of Houston 9 Formulas developed then are still used for resonant frequency calculations 1/2 2 1 ln 1.7726 2 e r ha aa ah π πε ⎛⎞ =+ + ⎜⎟ ⎝⎠ ⎩⎭
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ICEEA '07 -- Sept 20, 2007 4 Problems with microstrip antennas High frequencies result in More ohmic losses Electrically thicker substrates which support surface waves and decrease radiation efficiency University of University of Houston Houston Narrow bandwidth for electrically thin substrates
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ICEEA '07 -- Sept 20, 2007 5 Dielectric resonators Used as elements in microwave circuits Energy storage devices Problem with “leakage” University of University of Houston Houston
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ICEEA '07 -- Sept 20, 2007 6 Idea of a “dielectric resonator” antenna born Enhance the “leakage” or radiation to convert an energy storage device into an antenna University of University of Houston Houston Similar geometry to circular microstrip, but without a conducting patch Can choose dimensions and dielectric constant to enhance radiation
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ICEEA '07 -- Sept 20, 2007 7 US Army Harry Diamond Laboratories S. Long received a fellowship for Summer 1981 to do a feasibility study for new kinds of millimeter wave radiators and guides University of University of Houston Houston In suburban Washington D.C. (Adelphi, MD)
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ICEEA '07 -- Sept 20, 2007 8 2) US Army Harry Diamond Initial theoretical calculations were done University of University of Houston Houston
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ICEEA '07 -- Sept 20, 2007 9 3) US Army Harry Diamond University of University of Houston Houston Simple assumption of perfect magnetic conducting walls for cylindrical geometry
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ICEEA '07 -- Sept 20, 2007 10 Experimental investigation Circular cylindrical geometry chosen Previous use of cylindrical shape in microwave circuit resonators Experience with circular microstrip antennas Availability of dielectric material Fred Farrar aided in experimental work University of University of Houston Houston
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ICEEA '07 -- Sept 20, 2007 11 Antenna design Diameter held constant (determined by size of rod) University of University
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DRA_Torino2007_Presentation_090607b - University of Houston...

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