Broadband dual‐polarized crossed‐dipole antenna with tapered integrated balun for base‐station applications

Abstract

A ± 45 dual-polarized dipole antenna with low profile and stable radiation pattern over a wide operating band for base station is proposed. The antenna is formed by two polygon-shaped dipoles and a shaped metallic reflector. Two baluns with tapered structure are used to excite the dipoles for dual-polarized radiation and enhancing the impedance matching and bandwidth, while the shapedreflector is used to obtain stable radiation pattern in the horizontal plane during a wide frequency band. The design principles of crossed dipoles, baluns and reflector is described in detail. The proposed antenna achieves wide impedance bandwidth of 67% for VSWR<1.5, and high-isolation better than 31 dB over the operating band. In addition, the 3 dB beamwidth in the horizontal plane of the antenna is stabilized within the range of 66.3 ± 2.8 . These performances make the presented antenna applicable for mobile communications.

Broadband Circularly Polarized Printed Crossed-Dipole Antenna and Its Arrays for Cellular Base Stations

“…Due to increased channel capacity and reduced multipath fading, linearly polarized (LP) antennas with ±45• dual slant polarization have been set up as standard base station antennas to provide mobile communication services [3]. Therefore, Researchers have tried to design and introduce different structures of this kind of antenna for base transceiver station (BTS) applications, including crosseddipole antennas [4][5][6][7][8][9][10], patches antennas [11][12][13], magnetoelectric dipole antennas [14][15][16] and slot antennas [17]. The ease of structural modification of dual-polarized (±45•) crossed dipole antennas can satisfy the requirements of the BTS antennas, such as low cost, simple assembly high, front-to-back, high isolation, broad impedance bandwidth, and desirable beam width for the cell sector design [1][2][3][4][5][6][7][8][9][10].…”

“…Therefore, Researchers have tried to design and introduce different structures of this kind of antenna for base transceiver station (BTS) applications, including crosseddipole antennas [4][5][6][7][8][9][10], patches antennas [11][12][13], magnetoelectric dipole antennas [14][15][16] and slot antennas [17]. The ease of structural modification of dual-polarized (±45•) crossed dipole antennas can satisfy the requirements of the BTS antennas, such as low cost, simple assembly high, front-to-back, high isolation, broad impedance bandwidth, and desirable beam width for the cell sector design [1][2][3][4][5][6][7][8][9][10]. Compared to other categories in base station systems, these antennas are in high demand.…”

Broadband Dual-Polarized Magnetoelectric Dipole Antenna With Compact Structure for 5G Base Station

“…Printed cross dipole antennas are often directly supplied by coaxial cables or feed Balun, which can effectively improve the radiation performance. Several cross-dipoles with broadband and high-gain characteristics have been proposed [7], [8], [9], [10], [11], but they all have the disadvantage of having a large metal reflector and a high profile. In the design of reference [12], the dipole is embedded in the aluminum cube, which makes the overall structure of the antenna more compact and improves the impedance bandwidth and the isolation between ports, but the backward radiation is not well suppressed.…”

A height‐reduction antenna with simple structure for base station

“…In order to obtain directional radiation and high gain, base station antennas generally use a perfect electrical conductor (PEC) as the reflector, and at the same time to improve the radiation efficiency of the antenna, the height of the antenna from the reflector is usually 0.25λ 0 . [1][2][3][4][5][6][7][8] Therefore, low-profile antennas have important research for minimizing the manufacturing charge of operators and improving the antenna's anti-risk capability.…”