Abstract
A broadband dual-polarized base station antenna is proposed in this paper. The antenna consists of loop cross-dipoles, Y-shaped coupling feeding lines, and a metal box reflector. An equivalent circuit model including a signal flow diagram is established to analyze the mechanism of the proposed antenna in detail. Moreover, the Y-shaped coupling feeding lines are introduced to control the coupling with the antenna to achieve broadband and good impedance matching. The prototype of the antenna is fabricated and measured. The measured results show that the antenna with simple structures can operate at the band of 3.2–5.22 GHz (48%) with high port-to-port isolation (35 dB) and stable gain (9 ± 1 dBi). The measured results show good agreement with simulated results, especially in cross-polarization discrimination ratio (>27 dB) and the half power beam width (61° ± 3° at the E-plane, 68° ± 3° at the H-plane). In summary, the proposed antenna could be a good candidate for 5G sub-6 GHz base station applications.
Highlights
5G communication systems have received widespread attention due to their high capacity, low latency, and high data rate
Our work focuses on the proposal of a broadband dual-polarization loop dipole antenna with simple structure and good performance for 5G base station
The equivalent circuit model is introduced to verify the mechanism of the antenna, and the feasibility of the antenna structure is verified by comparing the simulation of the antenna structure and the antenna equivalent circuit
Summary
5G communication systems have received widespread attention due to their high capacity, low latency, and high data rate. In order to realize the broadband, the Γ-shaped feeding trips have been applied for a dual-polarized electromagnetic dipole antenna in [14], and the antenna covered the wideband (1.58–3.74 GHz, 81.2%) with a stable radiation pattern. With a simple feeding structure, the dual-polarized loop dipole antenna was designed in [18], which showed good performance in the band from 1.7 GHz to 2.7 GHz and a stable gain. By loading the FP cavity, the antenna obtained the wide band at 2.2–2.7 GHz, and realized the peak gain of 15.1 dBi. The year, a dual-polarized antenna with compact structure was proposed for the fifth-generation base stations at 3.5 GHz. The broadband and compact structure were realized because of the independent dielectric resonant cavity in [24]. It is a very meaningful research direction
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