In order to satisfy the communication requirements, a low profile + 45 • / −45 • dual-polarized base station antenna with a spacing of only 23 mm between the reflector and radiating surface is proposed. Different from the more common base station antenna units, the four folded dipoles are arranged in the same plane to form an octagon. When a single polarization is excited, the four folded dipoles are excited as a whole. Furthermore, two meandering L-shaped feeding lines are used to achieve a larger impedance bandwidth. Ultimately, this antenna has a relatively wide impedance bandwidth of 44.5% from 1710 to 2690 MHZ. The use of a reflector contributes to the formation of a stable radiation pattern, and aids in the realization of high cross polarization discrimination (XPD) available in the whole working frequency band. The antenna geometry description and operation principle are elaborated and several important parameters are also studied. The fabricated antenna array consists of 2 × 12 elements and the measurement results obtained demonstrate that the array meets the requirements in all bands of the DCS1800, PCS, 3G, and traditional WiMAX for modern communication on the eve of the 5G.INDEX TERMS Base station antenna, dual-polarization, folded dipole, antenna array.
A compact wideband dual-polarized antenna for base station application is proposed. The antenna element consists of a main radiator, two baluns, and a reflector. Two methods are used to enhance bandwidth and improve the port-to-port isolation. Firstly, by integrating the parasitic elements to traditional dipoles, new resonant modes are introduced to realize broadband, which can be controlled flexibly. Subsequently, part of the parasitic elements is removed to form asymmetric dipoles. Due to the asymmetry construction of the design, the polarization isolation of the antenna achieves more than 30 dB in the whole working band with stable radiation patterns. In addition, the specially designed parasitic elements achieve enhanced bandwidth without increasing the size of the radiator. The Simulation and measurement results show that the antenna has an impedance bandwidth of 32.7% (690-960 MHz). Moreover, a stable half-power beamwidth (HPBW) of 68°±5°and a high gain of 8.5±0.3 dBi is achieved. To verify the performance of the antenna, a compact high-gain base station array was designed and manufactured. The good performance of the proposed antenna makes it a promising candidate for 4G/5G base station application.
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