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A miniaturized monopole-like slot antenna with improved un-roundness of H-plane radiation patterns at higher frequency response for ultra-wideband application is presented and discussed. With the monopole-like slot antenna structure, wide working band (3.21–16.3 GHz) is obtained within a limited physical size (21 × 21.5 × 1.6 mm3). By modifying the structure of the proposed antenna, such as etching a quarter of a circular slot at the corner of the ground plane and a trapezoidal slot in the radiating patch, the un-roundness of H-plane radiation patterns is reduced by 5dB in high-frequency band. Measured results show that it has a bandwidth from 3.2 GHz to 17.52 GHz, which are in good agreement with simulations.

MINIATURIZED UWB MONOPOLE-LIKE SLOT ANTENNA WITH LOW UN-ROUNDNESS OF H-PLANE RADIATION PATTERNS AT HIGH-FREQUENCY BAND