Design of a Dual-Polarized Printed Dipole Antenna

This paper designed a dual-polarized printed dipole antenna which is composed of multiple layer substrates. Two printed radiators are located on different dielectric substrates, and they are placed orthogonally to each other to form two orthogonal radiator ports. For each polarization port, the coaxial line bottom feeding is used. The sizes of feeding structure and radiator of the two polarization ports are designed independently to meet the radiation performance of the antenna. The designed dual polarization antenna uses a metal via array to form a metal cavity. Under the condition of the array, it is convenient to improve the isolation between antenna elements. In order to reduce the size of the antenna, the dielectric embedding antenna technology is adopted, and a dielectric substrate with a certain thickness is placed above the surface of the dual polarization antenna to improve the equivalent dielectric constant. A dual polarization printed dipole antenna operating at 12.6GHz ~ 13.2GHz is designed and simulated. The antenna contains a five-layer dielectric substrate structure. The simulation results show that at the central frequency, the gains of the upper and lower polarization ports are about 2.34dB and 3.36dB respectively, the isolation of the two polarization ports is greater than 20dB, and the cross-polarization level is about 20dB in the main radiation pattern. The voltage standing wave ratio (VSWR) of the two polarization ports is less than 2. At the same time, it can be observed that the two polarization ports have wide beam performance and are suitable for array applications.