Abstract
A low profile modified Koch fractal shaped boundary, ultrawideband (UWB) multiple input multiple output (MIMO) antenna is presented. The radiators are elliptically tapered from the feed line with triangular shaped loading. The boundaries of the triangular shaped loading are embedded with modified Koch fractal shape to provide improved impedance matching. A band suppression characteristic at 5.5 GHz is incorporated by using an electric inductive capacitive resonator at the back of the substrate. Enhanced port isolation of <−20 dB is achieved by using a Maple leaf fractal structure shorted with ground plane. The proposed UWB MIMO antenna has peak realized gain of 4 dBi, and envelope correlation factor is less than 0.01. Measured results closely resemble the simulated results. Moreover, an equivalent circuit model of the proposed structure is extracted and compared with the em simulation result, which are in good agreement.
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