Design Of Ultra-Wideband Dual Polarization Antenna

In recent years, with the continuous development of communication systems and improving of the technology of microelectronic devices, ultra-wideband antenna technology has begun to gradually shift from the military field to the civilian technology. At the same time, the dual-polarized antenna technology is developing rapidly. This is conducive to polarization multiplexing, or to send and receive for the same time. On ground communications, dual-polarized antenna polarization diversity can communicate, when a better communication system against the anti-multipath fading characteristics; in satellite communications we can polarization isolation sending and receiving. Ultra-wideband dual-polarized antenna technology has become a hot topic now.This paper firstly describes the theoretical analysis of the polarization of the antenna, and investigates for the realization of linear polarization is basically used to design: micro strip, symmetrical oscillator, monopole antennas, loop antennas and the horn antenna. The reasons four their linear polarization are given and a variety of the development and change are shown out. In this paper, we choose a circular disk dipole antenna to study with which is evolved from monopole antennas.After the analysis of the structural design of circular disk dipole antenna of ultra-wideband, linear polarization, A program based on circular disk dipole antenna is purposed, electrical performance which can highly proof its electrical performance by the connection of a smaller disk through the feed structure to enhance the performance of high frequency, the physical structure of the antenna is also strengthen by adding the media board to provide physical support and improve low frequency performance of the antenna.On this basis, a design of a continuous two disk additional circular disk dipole antenna is purposed, Simulation data shows within the 4-40GHz the antenna has the data of VSWR <2.5, cross-polarization <-30dB. This linearly polarized antenna elements placed orthogonal space to achieve the dual-polarized design, and gives the structure of the two-plane polarization and circular polarization design. Finally, according to design a pair of dual-polarized antenna, the antenna processing program and tested. The results are discussed according to the media board loading of the antenna performance. VSWR and cross polarization results verify the simulation design.