Abstract
A dual-wideband dual-polarized antenna using metasurface for the fifth generation (5G) millimeter wave (mm-wave) communications is proposed. It is designed and analyzed based on characteristic mode theory (CMT). The proposed metasurface is mainly composed of a $3\times 3$ square-patch, in which its four corner patches are further sub-divided into a $4\times 4$ sub-patch array, while the size of the other four edge patches is reduced and the center patch is etched with a pair of orthogonal slots. By doing so, the side lobe level can be effectively reduced and the main beam radiation can be enhanced. The metasurface is excited by a pair of orthogonally arranged substrate-integrated-waveguide (SIW) to grounded-coplanar-waveguide (GCPW) dual-polarized feeding networks that help to reduce the insertion loss and expand the frequency bandwidth of the feeding ports. In order to yield higher gain, four proposed metasurfaces are fed by a pair of 1-to-8-way power divider feeding networks including a pair of low-transmission-loss E-plane phase shifter. Measured results show desirable impedance bandwidths of 13.85% (24.2-27.8 GHz) and 14.81% (36.9-42.8 GHz) in the lower and upper frequency bands, respectively, and their corresponding average gains are 13.96 and 15.46 dBi.
Highlights
Due to the outstanding advantages such as miniaturized size, double capacity, eliminating multi-path fading effects, etc., dualband dual-polarized antenna has been widely applied in mobile communications [1]–[3]
The frequency bands of 24.75-27.5 GHz and 37-42.5 GHz have been preliminarily assigned to the fifth generation millimeter wave communications in China [4]
A dual-wideband dual-polarized metasurface antenna with high gain is successfully studied for the 5G mm-wave communications
Summary
Due to the outstanding advantages such as miniaturized size, double capacity, eliminating multi-path fading effects, etc., dualband dual-polarized antenna has been widely applied in mobile communications [1]–[3]. In [11], by using dual-layer complementary magneto-electric (ME)-dipole structure, dual wide bandwidths of 25.7% (0.78-1.01 GHz) and 45.7% (1.69-2.69 GHz) with high gain of over 8 dBi can be achieved. In [14], by exciting both the aperture-shared lower patch and the upper parasitic patch, dual bandwidths covering X-band and S-band (19.3% and 22%) with gain of better than 8.5 dBi can be obtained Both of the works in [13] and [14] are still unsuitable for 5G mm-wave communications. In [19], by employing a SIW Y-junction cavity-fed dual slot to excite a modified metasurface, dual wide bandwidths covering 23.7-29.2 GHz and 36.7-41.1 GHz are realized in 5G mm-wave communications for the first time. During the design process, according to the value of MS(f ), modal current distributions and radiation patterns of Modes Jn, by choosing suitable Modes Jn and restraining the unwanted ones, good radiation patterns in the desired frequency bands can be excited
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