Research On Ambient Rf Energy Harvesting Technology Based CRLH Metamaterial Antenna

With the development of Internet technology and applications, the number of wireless node devices has increased rapidly. However, due to the limited capacity of the power supply battery, the life cycle length of the wireless node equipment is very limited, which limits and hinders the development of wireless sensor networks. Therefore, the wireless power supply problem is the key problem in the process of sensor network design.Therefore, this paper is devoted to solving the problem of wireless energy collection in complex and variable electromagnetic environment,and proposes a design scheme of tunable antenna and adaptive power processing circuit based on CRLH left and right meta-materials broadband band. In order to verify the correctness and feasibility of the scheme, the design of the design from the basic theory, research and analysis of the characteristics of ultra-material antenna, metamaterial antenna in the field of energy collection applications such as research status, multi-band matching circuit, rectifier circuit, Pressure circuit and other key technical problems, and then through simulation optimization to get the best results,the final processing and get the physical test to verify the correctness and feasibility of the theory. In this paper, the arrangement of the idea is consistent with the above steps. Firstly, the characteristics of the metamaterial antenna are analyzed, the key problems to be solved are analyzed, the adjustable antenna design and the adaptive energy processing circuit are designed, and the detailed design process is given. And analyze the test results to draw conclusions. The main research contents and innovations of the paper are as follows:(Such as GSM, EDGE, WCDMA, TD-SCDMA, LTE, WiFi and other mobile communication frequency band, in the realization of the band at the same time to complete the miniaturization of the design , And to ensure high efficiency and performance, suitable for use in the environment of microwave wireless energy acquisition. The design of the design through the theoretical analysis, simulation, measured the feasibility of the design.(2) To study the energy collection problem in the complex and changeable electromagnetic environment, a multi-band adaptive energy processing circuit design scheme is proposed. First of all, based on a series of matching circuit (equivalent to band-pass filter circuit), the electromagnetic waves of different frequency bands, and sent to the corresponding branch. Second, the corresponding band of electromagnetic waves into the band to match the rectifier circuit, through the rectifier to obtain the DC signal, into the routing circuit module. Further, the DC signal boosts the voltage value through the boost processing circuit module, and supplies the electric energy into the super capacitor to complete the storage,and finally completes the entire radio wave energy collecting process.