Design Of Broadband Multipolarized Antenna

With the rapid development of modern wireless communication and the comprehensive arrival of 5G communication era,people's requirements on communication capacity and communication quality are constantly improving.At the same time,more and more integrated communication system,the need for broadband,multi-polarization antenna is increasingly prominent.Wideband multi-polarization antenna can cover a wide range of frequency band,improve the multipath attenuation of signal,and improve the communication quality.Therefore,the research of wideband multi-polarization antenna has great application value.In this paper,based on the theoretical research of wideband antenna and multi-polarization antenna,combining the advantages of the two kinds of antennas,a dual-polarization ultra-wideband omnidirectional antenna applied to indoor system distribution and a double-polarization wideband high-gain Vivaldi antenna with artificial electromagnetic material placed in an orthogonal position are proposed.The research results of this paper are mainly reflected in two aspects:The basic theory and technology of omnidirectional antenna and multi-polarization antenna are summarized.In this paper,the design and realization of broadband antenna are described,and the different realization methods and key points of multi-polarization antenna are summarized.An UWB omnidirectional antenna with dual polarization based on indoor distribution system is designed.The antenna is divided into two parts: horizontally polarized omnidirectional antenna and vertically polarized omnidirectional antenna.A horizontally polarized omnidirectional antenna is a symmetrical four-element surface patch antenna.Based on the optimal design of the element dipole antenna,the target antenna is constructed by combining arrays.The antenna omnidirectional radiation is realized by gap coupling feeding through the back one quarter feed network.The vertically polarized omnidirectional antenna is a monopole antenna composed of two orthogonal tangential triangles.The simulation and measurement results show that the horizontally polarized omnidirectional antenna and the vertically polarized omnidirectional antenna have good omnidirectional radiation characteristics.The operating frequency band ranges from 1.4GHz to 2.6GHz,and the polarization isolation performance is good.The results show that the wideband omnidirectional antenna is suitable for indoor distributed communication system.A Vivaldi antenna with orthogonal placement is designed.The low-frequency current is distributed uniformly around the slot line by means of edge grooving,which improves the gain and orientation of the low-frequency range of the antenna.The structure of the traditional Vivaldi antenna was optimized to reduce the size of the antenna.At the same time,the gain and directivity of the antenna are improved by adding artificial electromagnetic materials.The comparison between simulation and measurement shows that the antenna has the characteristics of ultra-wideband and high gain,and the isolation between the two orthogonal elements is good.