Wideband dual-polarized all-metal cross-dipole antenna with feeding column

Abstract

A wideband dual-polarized all-metal dipole antenna with a novel feeding structure was proposed in this paper. The antenna mainly consists of five parts, which are metal dipole, feeding column, cross feeding sheet, coaxial line and ground plane. A new type of feeding column is introduced between the feeding coaxial and the dipole, which can improve the impedance performance of the antenna at high frequency range. To verify the design, the antenna unit was processed with the size of 0.47λ0 × 0.47λ0 × 0.31λ0. where λ0 is the wavelength of the middle frequency. From the measured results, the antenna achieves a relative bandwidth of 83.5% (3–7.3 GHz) with a reflection coefficient < -10 dB, and the port isolation is greater than 30 dB in the entire frequency band. At the same time, the measured gain of the antenna is 6–9 dBi, the antenna pattern is stable over the entire frequency bandwidth. In addition, the proposed dipole sheet is fixed on a feeding column and is therefore more suitable for working in the C-band or even higher X-band. The antenna adopts an all-metal structure, which is not only suitable for high-power applications, but also more suitable for applications under severe conditions such as strong vibration, high and low temperature.