Abstract
A wideband dual-polarized antenna is proposed for 4G and 5G communication applications. The antenna element consists of a pair of opened-loop dipoles for dual-polarization and its three inherent resonant modes are shifted closer to form a wide bandwidth. With additional U-shaped slots etched around the feed point, the input impedance of the antenna element is matched to 50 Ohm. The fabricated antenna element operates from 1.8 to 4.0 GHz, having 75.9% (VSWR ≤ 2) impedance bandwidth and high port-to-port isolation (>25 dB). It also achieves a 67±1° beamwidth in H-plane and 68.7 ± 3.3° in V-plane with 8.5 ± 1 dBi gain across the supported bands. By using six antenna elements and designing RF phase shifting module (RFPSM) based on vector modulators, a six-element dual-polarized array with electrically downtilt is also fabricated and measured, realizing a peak gain of 16.8 dBi, a similar beamwidth in H-plane as single antenna element and an electrically downtilt in V-plane from 0° to 12° which is preferred in communication applications. This antenna array could be used for future 5G communication and other applications.
Highlights
In the 5G era, massive mobile devices and access points need to be connected to the wireless network with fast data rate and channel capacity
Due to the advantages of dual polarization to combate the multipath fading and reduce the number of antennas, dual-polarized antennas with wider bandwidth and stable radiation patterns are popular in communication applications
Based on the above principle [16], Type 2 is designed. It can be obtained from the return loss of Type 2 that after the parasitic resonator is added, the second and third resonant modes are shifted to the low frequency band
Summary
In the 5G era, massive mobile devices and access points need to be connected to the wireless network with fast data rate and channel capacity. A wideband dual-polarized antenna element and its array with a six-channel RF phase shifting module (RFPSM) are designed and analyzed for 4G and 5G communication applications. Based on the above principle [16], Type 2 is designed It can be obtained from the return loss of Type 2 that after the parasitic resonator (dipole 2) is added, the second and third resonant modes are shifted to the low frequency band. Three available resonant modes of Type 3 are close to each other, evenly distributed in 1.5 to 4 GHz. In order to achieve good broadband input impedance matching, Type 3 is improved into Type 4 (proposed antenna) by etching U-shaped slots. The proposed antenna based on Type 4 achieves a wide operating bandwidth
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