Microstrip dipoles on electrically thick substrates |
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Authors: | D R Jackson and N G Alexopoulos |
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Institution: | (1) Electrical Engineering Department, University of California, Los Angeles, 90024 Los Angeles, CA |
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Abstract: | Certain basic radiation properties of microstrip dipoles on electrically thick substrates are investigated, and a comparison is made with the case of dipoles printed on a dielectric half-space. It is concluded that the microstrip dipole radiation properties become sensitive to substrate loss as the substrate thickness increases, with the half-space properties obtained for an adequate amount of loss. Asymptotic formulas for radiated power and efficiency are given for both the thick substrate and half-space problems, showing the behavior with increasing dielectric constant. The method of moments is used to extend the analysis to center-fed strip dipoles, and a method of improving both the efficiency and gain of a printed antenna by using a superstrate layer is discussed.This research was supported by NSF Research Grant ESC 82-15408 and U.S. Army Research Grant DAAG-29-83-K-0067. |
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Keywords: | Microstrip dipoles printed circuit antennas thick substrates half-space radiation patterns efficiency |
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