Application Research Of 3D Current Manipulation In New RF Devices

High-performance RF devices are essential to the development of wireless communications.For RF devices,the source of radiation can be classified into conduction current and displacement current.The conduction current is formed by the charge moving in the conductor,and the displacement current is generated by the discontinuity of the magnetic field at the boundary.Therefore,the design and manipulation of RF devices is essentially the design and manipulation of current.The design of device current degrees of freedom will be another entry point for improving device performance and exploring new device applications.The birth of metamaterial methodology has provided the possibility of flexible manipulation of current,and has achieved a breakthrough in the shortcomings of traditional RF devices through metamaterial.If the current degree of freedom brought by the metamaterial design methodology can be combined with the degree of freedom of the device itself,will it open up a new way to adjust the performance of the device and promote the new application of current control in new RF devices?For this reason,we respectively elaborated the manipulation mechanism of 1D and 2D current,and enumerated some representative works.The above two control mechanisms are analyzed,and a design method of 3D current control devices combined with metamaterial design methodology is proposed.The details of this work are as follows:1.Summarize the main applications of 1D and 2D current control.Relying on the slot waveguide antenna,the current degree of freedom is increased from one dimension to two dimensions by changing the structure,and an OAM generator is proposed.After quantitative analysis,it is known that the device can generate OAM in the radio frequency band.The device has two ports and can generate vortex beams with topological charges of ±2 and ±3 in the frequency range of 8GHz to 12 GHz.2.A physical model of 3D current control is proposed,and the mechanism of 3D current control is briefly explained.A new type of RF radiator based on 3D current control is designed and implemented using the physical model as a guide.Subsequently,we fabricate a flexible and reconfigurable RF radiator through 3D printing technology to verify the concept of 3D current manipulation.By changing the operating frequency and mechanical form,the radiation pattern generated by the device can be switched between 12 states.And,inspired by the maximum likelihood estimation method in digital communication,we propose a robustness analysis method to evaluate the potential interference between the ideal situation and the actual situation.This work is expected to provide a new model for the next generation of key distribution and wireless communication.Not only that,the device integrates its own shape and position information into the RF signal,which means that the work is expected to be applied to the detection of large-scale geological movements such as land subsidence and glacier movement.