Abstract
A novel ultra-wideband millimeter wave (mmWave) slotted circular patch antenna and array are proposed in this paper, where each circular patch antenna element is loaded with three pairs of folded strips for enhancing the bandwidth and fed by a substrate integrated waveguide (SIW) through a coupling slot. As a result, a multimode antenna element with the ultra-wideband characteristic can be realized and the impedance fractional bandwidth (FBW) with | <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">S</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> |< -10 dB is up to 66.9%. Furthermore, an 8×8 antenna array prototype is designed and fabricated. Measured impedance FBW with | <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">S</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> |< -10 dB of 56% and measured average radiation efficiency of 73.8% are achieved. With the wideband and low-profile features, this antenna can be a promising candidate for mmWave communications.
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