Abstract
Crossed-dipole (CD) antennas have been widely employed for dual polarization in wireless communication systems in recent years. In this paper, a novel design concept of dual-polarized shared-dipole (DPSD) antenna is presented. Different from the traditional CD antennas, the arms of the DPSD antenna are shared for two orthogonal polarizations. This design technique leads to significant size reduction and high isolation compared to the traditional CD antennas. The operation principle of the proposed antenna is theoretically analyzed. To validate the presented design concept, two novel DPSD antennas are designed, fabricated, and measured. The first design is a four-port DPSD antenna, which is a straightforward demonstration of the operation principle of the DPSD antenna. The second design is a highly integrated DPSD antenna, which avoids the use of a feed network and provides a simple configuration to design the dual-polarized antenna. Both of the DPSD antennas are designed to operate at 1.7–2.7 GHz for base station applications. The simulated and measured results confirm that the two DPSD antennas have wide bandwidth with VSWR 35 dB dB. In addition, stable gain and half-power beamwidth are obtained with the variance less than ±0.55 dB and ±3.5°, respectively.
Highlights
DUAL-POLARIZED antennas have been widely used for wireless communications
As a general definition in this paper, the yz plane is designated as the horizontal plane (H-plane), and the xz plane is defined as the vertical plane (V-plane)
To validate the operation principle and the analysis of the four-port dual-polarized shared-dipole (DPSD) antenna, the proposed antenna is verified by two measurement methods, one is measured directly without feed network, and the other is measured with feed network
Summary
DUAL-POLARIZED antennas have been widely used for wireless communications. Compared with the single polarized antennas, dual-polarized antennas have the advantages of reducing the multi-fading effect and increasing the channel capacity [1]. Antennas are required for ±45° polarization with wide impedance bandwidth, high isolation and stable radiation characteristic [2]-[4]. The arms of those reported crossed dipole antennas [17], [20]-[25] and dual-dipole antennas [18]-[19] for one polarization are not shared for another polarization, and they are separate and independent with a large radiator size. Thanks to the shared-dipole configuration, the overall size of the radiator can be theoretically reduced by 50% compared to the traditional dual-polarized CD antennas. The presented dual-polarized shared-dipole (DPSD) antennas have a wideband impedance bandwidth and high isolation which is comparable to the existing designs including the traditional differentially driven dual-polarized CD antennas reported in [3], [17], and [21]. Both the four-port DPSD antenna and the highly integrated DPSD antenna meet the requirements for the base station systems (1.7 GHz to 2.7 GHz with VSWR< 1.5 and isolation> 35 dB) with stable gain and HPBW
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