In this article, a small broadband dual-polarized antenna is presented. The main structure consists of the four irregular polygon patches printed on the bottom layer of the substrate, two trapezoidal coupling plates printed on the top layer of the substrate, and a box-shaped reflector at the back of the substrate at resonance distance. Design principles are based on the rules of complementary antennas, cross dual-polarized antennas, and aperture antennas. The proposed antenna has technical specifications such as impedance bandwidth 48% (1.7-2.7 GHz) with lower than 15 dB return loss, port-to-port isolation about 32 dB, high pattern stability, and half-power beam width about 63 AE 9 . The antenna measurement results confirm these. At the end, a comparison between the proposed antenna and the other antennas of this type is presented. The proposed antenna has smaller dimensions, high gain, high port isolation, and excellent pattern stability over the whole bandwidth. The proposed antenna can be used in the base transceiver stations (BTSs) and multi input-multi output (MIMO) systems.
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