# A Low-Profile Dual-Polarized Magneto-Electric Dipole Antenna for 5G Applications
###### Abstract  
A low-profile dual-polarized magneto-electric dipole (MED) is presented in this communication. The low profile was achieved using meander slots on the vertical magneto dipole, reducing the antenna height to \(0.15\lambda_{0}\), where \(\lambda_{0}\) is the wavelength of the center frequency. Relatively, the proposed MED structure is easier to process and more stable than the traditional low-profile MED structure. The broadband performance for 5G Applications was realized based on MED structure, and the dual-polarization structure has wider coverage area and lower multipath transmission losses. Moreover, the orthogonal feeding structure provides a satisfying isolation between two ports. To verify the simulation results, a prototype of the proposed antenna was fabricated and measured. The results show that the overlapped operating frequency bandwidth with \(\mid\)S111 \(\leq-10\) dB, \(\mid\)S121 \(\leq-20\) dB was 36.8% from 3.1 GHz to 4.5 GHz, the peak gain reached 10.2 dBi, and the average gain exceeded 8.5 dBi. The measured 3 dB beamwidth with more than 44 degrees beamwidth was realized in both E-plane and H-plane. In addition, cross-polarization levels below \(-22\) dB that covered the above frequency band were achieved. Compared with other MED antennas, in addition to broadband and high gain, the proposed antenna has the advantages of a low profile, easy processing, and low cost, which make it a competitive candidate for 5G applications.  
wideband antenna; magneto-electric dipole (MED); low-profile; dual polarization; 5G applications +
Footnote †: journal: Applied  
it is necessary to carry out corresponding miniaturization research, with the emphasis on reducing the profile height of the MED.  
The profile height of the MED antenna is determined by the U-shaped structure composed of the vertical metal wall and the floor, which is equivalent to the magnetic dipole antenna. Therefore, if the height of the U-shaped structure was reduced, a low-profile MED will be realized. A method of folding vertical metal wall [12; 13] and another method of inclining metal wall [14; 15] are used to partially realize a low profile, but the correspondingly structural stability is inferior and the 3D structure of the antenna is more complicated. A number of researchers put emphasis on loading dielectric to achieve a low profile [8; 16; 17; 18]; compared with no dielectric, the waveguide wavelength of the MED antenna can be reduced by adding dielectric between vertical metal walls, which means a lower profile in physical dimension. However, because of the added dielectric, the processing cost and difficulty also increase.  
In this study, a low-profile MED antenna was provided by meandering slots on the magnetic dipole antenna. Since the meandering slots were set on the plane structure, this meant that the low-profile structure was more convenient to process. In addition, a dual polarization structure was adopted to achieve a more desirable antenna performance. Compared with the other proposed broadband MED antennas adopting meandering slot, the vertical metal wall was designed to be a lower cost alternative. In Section 2, the structure, the operating principles, and simulated results of the proposed MED antenna are presented. Section 3 introduces the measured results of the fabricated MED. Finally, Section 4 draws a concise conclusion.