Electromagnetic super surface-based environment radio-frequency micro energy collection device

Abstract

The invention discloses an electromagnetic super surface-based environment radio-frequency micro energy collection device, which comprises a dielectric substrate, wherein a metal floor is laminated on the back surface of the dielectric substrate; a metal ring structure is laminated on the front surface of the dielectric substrate; the dielectric substrate is of a rectangular structure of which the surface is in a square form; metalized through holes are arranged on the diagonal lines of the surface of the dielectric substrate; the metal floor is in the square form and the side length is equal to that of the square on the surface of the dielectric substrate; the metal floor, the metal ring structure and the dielectric substrate are coaxial; the metalized through holes are connected with the metal ring structure on the front surface of the dielectric substrate; and the metalized through holes are connected with the metal floor through loading resistors. The electromagnetic super surface-based environment radio-frequency micro energy collection device is simple and compact in structure, can keep high load energy collection efficiency within a wide-angle incident range when an incident electromagnetic wave is in an arbitrary polarization mode, is applied to energy supply of a wireless sensor network, and has a wide application prospect in the aspects of the internet of things, a wireless sensor and the like.

Description

technical field [0001] The invention belongs to the technical field of physics, and further relates to an environmental radio frequency micro-energy collection device based on an electromagnetic metasurface in the technical field of wireless energy transmission and collection. The invention can use the collected radio frequency micro-energy of communication in the environment for the energy supply of the wireless sensor network. Background technique [0002] With the rise of the Internet of Things technology, the miniature wireless sensor network with low power consumption has been widely developed. At present, the sensor network is powered by batteries. Even if it works in low power consumption mode, the service life of the nodes is very limited and must be replaced regularly. Tens of thousands of device batteries would be difficult to achieve. Electromagnetic wave energy in the environment can now be obtained from tens of billions of wireless transmitters around the world...

AI Technical Summary

Problems solved by technology

The microstrip receiving antenna is a coaxial feeding rectangular microstrip antenna, which can collect electromagnetic wave energy in the WIFI frequency band. The disadvantage of this device is that the overall size of the microstrip antenna is relatively large relative to the working wavelength, and it has a fixed polarization. Directionality, unable to collect electromagnetic wave energy at any polarization angle, it is difficult to meet the needs of efficient use of environmental energy

The disadvantage still exists in this device is that although the load energy absorption rate of the device is high, the load resistance of the unit structure in the device is more, and the collected energy is distributed to each load resistance. If an array is formed, each load Both require a rectification circuit, so the rectification circuit at the back end of the load will be very complicated, and most of the energy will be lost in the circuit, so the limitations in practical applications are relatively large

[0006] To sum up, the environmental radio frequency micro-energy collection is currently facing two problems. 1. The existing front-end for collecting radio frequency energy signals is a traditional antenna, but the size of the antenna is comparable to the wavelength, which will generate secondary radiation and cause With its inherent gain and polarization direction, the size and direction of electromagnetic wave energy in the environment are random. The existing wireless sensor nodes are distributed in a wide range and the distribution environment is complex. It is difficult for traditional antennas to meet the needs of efficient use of environmental energy. 2. Although the existing metamaterial electromagnetic energy harvesting device can collect energy, its structure is complex and cannot efficiently utilize the collected energy

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