THE ANNULAR APERTURE ANTENNA WITH A HEMISPHERICAL CENTER CONDUCTOR EXTENSION
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An annular aperture antenna mounted on an infinite ground plane and containing a hemispherical center conductor extension above the ground plane is investigated. A Greens function for the region above the ground plane is derived so as to be compatible with numerical solution techniques. A magnetic field integral equation is obtained in terms of the unknown tangential aperture electric field and is solved by the method of moments. A comparison between flush mounted and hemispherically extended annular aperture antennas is presented for the tangential aperture electric field, the coaxial line apparent input admittance, and the far radiated field. Copyright 1987 by The Institute of Electrical and Electronics, Inc.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
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