Cavity-backed proximity-coupled reconfigurable microstrip antenna with agile polarizations and steerable beams

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Journal Article
IEEE Transactions on Antennas and Propagation, 2017
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IEEE A major challenge for a combined reconfigurable antenna is to realize both polarization switching and beam steering independently in a compact antenna structure. A cavitybacked proximity-coupled reconfigurable microstrip antenna proposed in this communication provides an efficient solution. Beam lead PIN diodes DSM8100-000 are employed as switching elements to achieve the reconfiguration. Three different linear polarizations (0 & #x00B0;, 45 & #x00B0;, 90 & #x00B0;) are realized by switching the diodes on a proximity-coupled feed network. For each polarization state, the main beam can be steered to three directions by using a reconfigurable parasitic-element network. The parasiticelement network is printed on the same plane of the radiating patch, thereby making the antenna compact. This antenna has 9 different working modes and for all the working modes, the reflection coefficients are below & #x2212;10 dB with the measured realized gains ranging from 7.2-8.1 dBi.
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