Abstract
The most common approach to size reduction of wideband and ultra-wideband antennas (UWB) is to introduce topological modifications of the ground plane, the feeding line, and/or the antenna radiator. The first type of alterations is the most popular due to their efficiency. Here, we carry out a study concerning a particular type of modifications, specifically, a slit under the feed line, in several variations: rectangular and elliptical slits of one and two sections. The effects of the slits on achievable miniaturization rate is investigated using a set of reference UWB antennas. For the sake of fair comparison, the minimum-size structures are obtained through numerical optimization of all antenna parameters in each case. The results indicate that one-section elliptical slit is more advantageous than the one-section rectangular slit: an average miniaturization rate is 26 percent versus 19 percent. For two-section slits the situation is opposite (42 and 33 percent size reduction for rectangular versus elliptical slit). Furthermore, the results are consistent for all benchmark antennas which indicates universal properties of the considered geometry modifications in the context of antenna miniaturization.
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