| With the rapid development of wireless communication technology,various communication systems coexist for a long time,and spectrum resources are in short supply.With the advent of the 5G era,the Internet of Vehicles technology has been further developed,and the huge number of users needs to increase the overall capacity;the functionality and safety of vehicles have also become the focus of attention.The Internet of vehicle(Io V)is a vehicle-centered communication network composed of various vehicle-related networks.As an important part of the wireless communication system,the antenna is responsible for the transmission and reception of wireless signals.The quality of the antenna performance directly affects the quality of wireless communication.Artificial magnetic conductor(AMC),as a kind of electromagnetic metamaterial,has become a research hotspot in recent years due to its unique phase and impedance characteristics.It has great application potential in new antenna design.In this paper,combined with the broadband AMC,the design and research on multi-polarization new antenna for the Internet of Vehicle is carried out.The main research work completed includes the following two aspects:1.A broadband dual-polarized dipole vehicle-mounted antenna based on the reflection cavity of artificial magnetic conductors is designed.The broadband characteristics of the antenna are achieved by introducing parasitic patches.In order to improve the antenna gain and reduce the antenna profile,a circular reflective cavity structure with a broadband artificial magnetic conductor as the bottom reflective surface is designed.The in-phase reflection bandwidth of the artificial magnetic conductor is 2.35-4.25 GHz,and the zero reflection phase point is 3.3 GHz.The designed antenna model is processed and measured,and the measured results are consistent with the simulation results.The designed antenna can obtain a working bandwidth of 2.1-3.99 GHz,and the port isolation is greater than 25 d B,and the gain can achieve 8.34-10.86 d Bi in the entire working frequency band.2.An ultra-wideband circularly polarized MIMO antenna is proposed.The antenna element includes top radiating layer,middle metallic plate layer,and bottom feeding network layer.In order to improve the impedance matching of the antenna element,the middle layer composed of four square metallic plates is introduced between the top radiating structure and the bottom feeding network.The broadband circular polarization characteristic is realized by four-way feeding network,and the broadband working mechanism of the antenna is analyzed by using the characteristic mode theory.The proposed MIMO antenna is composed of five identical antenna elements,and five antenna elements are located on five faces of the cube.In addition,the MIMO antenna is supported by a 3D printed resin pedestal,while the pedestal has round hole for coaxial.The simulation results are in good agreement with the measured results.The measured results show that the impedance matching bandwidth of antenna element is 2-7.96GHz(121%),the circular polarization axial ratio bandwidth is 2.1-6.8 GHz(101.1%),the realized gain is 4.5 to 9.6 d Bi over the entire operating frequency band.The ports isolation are greater than 28 d B and the ECC are lower than 0.01,which indicate great MIMO antenna characteristic. |
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