Abstract
This paper presents a development of a compact ultra-wideband (UWB) slot antenna using stair-step impedance technique with a pentangular stub for 5G application. The proposed antenna is miniaturized and fabricated on a very cheap FR4 substrate with a dimension of 20x22 mm2. Also, the stair-step segments and a pentangular stub in the slot antenna provide improving the impedance bandwidth. The stair-step segments are used to tuning at a lower frequency, and a pentangular stub provides to tuning the higher frequency. The proposed antenna can operate the frequency range between 3.1 GHz to 14 GHz. The radiation pattern is bidirectional throughout the operating frequency range, while the average antenna gain is about 3.5 dBi.
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