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Many wireless applications require planar antennas but with monopole-like, vertically polarized radiation, a design challenge that cannot be easily achieved by using conventional microstrip patch or other types of printed antennas. In addition, while there have been significant advances in design of low-profile printed patch-type antennas in the frequency ranges of L-band and above, the patch antennas...
Recent MIMO applications have noticeably magnified the importance of multi antennas. Antenna engineers are therefore constantly challenged with the temptation to search for optimum designs. In recent years, evolutionary optimization (EO) techniques are finding growing applications to the design of electromagnetic systems of increasing complexity. Among various EO's, nature inspired techniques such...
This paper addresses a fundamental issue regarding electrically small antennas. In conventional cases electrically small antennas suffer the fundamental limit of high Q and can not be used for broadband radiation. However, by integrating high-speed switch devices on the antenna, it is found that the bandwidth limit on the radiation can be overcome. This is because the high-Q value associated with...
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