CN-121983792-A - Dual-function super-surface device and system applied to passive radio frequency energy collection and back scattering communication

CN121983792ACN 121983792 ACN121983792 ACN 121983792ACN-121983792-A

Abstract

The invention discloses a double-function super-surface device applied to passive radio frequency energy collection and back scattering communication, which comprises three dielectric substrates passing through a positioning Kong Duidie, wherein each dielectric substrate is printed with a first metal layer, a second metal layer and a third metal layer which are sequentially arranged from top to bottom, the first metal layer is a first orthogonal grating structure loaded with a plurality of CMOS switches, the second metal layer is a phase modulation layer consisting of a plurality of resonance units capable of being independently regulated and controlled, and the third metal layer is a second orthogonal grating structure, and the grating orientation of the second metal layer is mutually orthogonal with the first orthogonal grating structure. The invention also discloses a back scattering communication system. The communication process of the invention does not need a power amplifier, only consumes micro-watt power consumption of switch switching, combines energy collection of the environment, realizes battery-free operation, overcomes the bottleneck of direct path interference in traditional environment backscatter communication by utilizing polarization isolation, and can obtain a more reliable communication distance under the same transmitting power.

Inventors

WU TING
QIN HAODONG
XUE YIXUAN

Assignees

西安理工大学

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (8)

1. The dual-function super-surface device for passive radio frequency energy collection and back scattering communication is characterized by comprising three dielectric substrates passing through a positioning Kong Duidie, wherein each dielectric substrate is printed with a first metal layer, a second metal layer and a third metal layer which are sequentially arranged from top to bottom, the first metal layer is a first orthogonal grating structure loaded with a plurality of CMOS switches, the second metal layer is a phase modulation layer formed by a plurality of resonance units capable of being independently regulated and controlled, and the third metal layer is a second orthogonal grating structure, and the grating orientation of the third metal layer is mutually orthogonal with the first orthogonal grating structure.
2. The dual function subsurface device for passive rf energy harvesting and backscatter communications of claim 1, wherein the resonant cells in the second metal layer are of type I configuration that provides continuous phase modulation of 0 ° -360 ° by varying the angle of cut and angle of rotation.
3. The dual function subsurface device for passive radio frequency energy harvesting and backscatter communications of claim 1 wherein the subsurface is formed as a planar array of 9 x 9 resonant cells arranged periodically.
4. A dual function subsurface device for passive rf energy harvesting and backscatter communications according to claim 3, wherein the angle of cut and rotation of the resonating unit is determined by its array coordinates to produce a radially symmetric phase profile required for focusing.
5. The dual function subsurface device for passive rf energy harvesting and backscatter communications of claim 1 wherein the three dielectric substrates are all FR4 board material having a thickness of 3mm-4mm and a dielectric constant of 4.1-4.4.
6. The dual-function subsurface device for passive rf energy harvesting and backscatter communication of claim 1, wherein when the CMOS switch is turned on, the first metal layer is equivalent to a metal reflective surface, causing incident vertically polarized electromagnetic waves to be homopolar reflected, and when the CMOS switch is turned off, the incident vertically polarized electromagnetic waves are converted into horizontally polarized electromagnetic wave transmission output via the first metal layer, the second metal layer and the third metal layer in sequence.
7. The back scattering communication system is characterized by comprising the dual-function super-surface device applied to passive radio frequency energy collection and back scattering communication, which is used as a dual-function antenna, a rectification circuit, an energy management module and a control circuit, wherein the dual-function super-surface device is used for being used as a dual-function antenna, the rectification circuit is electrically connected with the super-surface and used for converting radio frequency energy transmitted and focused by the super-surface into direct current electric energy in a second working mode, the energy management module is electrically connected with the rectification circuit and used for storing and distributing the direct current electric energy, and the control circuit is powered by the energy management module and connected with a CMOS switch control end and used for generating a control signal according to sensor data to be sent, and switching the working mode of the super-surface so as to carry out amplitude modulation on incident carriers and realize the back scattering communication.
8. The backscatter communication system of claim 7, wherein the control circuitry is configured to implement multi-level amplitude shift keying modulation by zonally controlling CMOS switch states of different regions on the dual function subsurface device.

Description

Dual-function super-surface device and system applied to passive radio frequency energy collection and back scattering communication Technical Field The invention belongs to the technical field of wireless communication and energy transmission devices, and particularly relates to a double-function super-surface device applied to passive radio frequency energy collection and back scattering communication and a back scattering communication system. Background In the process of mass deployment of the internet of things (Internet of Things, ioT), the problem of continuous energy supply of mass terminal devices has become a key bottleneck. The traditional battery power supply mode has the inherent defects of high maintenance cost, poor environmental adaptability, insufficient sustainability and the like, and particularly has outstanding appearance in scenes (such as remote monitoring, implanted medical equipment and the like) with strict requirements on long-term maintenance-free. For this reason, environmental energy harvesting technology is an important approach to achieve self-powering of devices, where radio frequency energy harvesting is of great interest because of the availability of widely available wireless signals (e.g., frequency band 2.4 GHz ISM). However, the power density of the environmental radio frequency signals is generally lower than 1 mu W/cm < 2 >, the energy collection efficiency is limited, and the complete functions of data acquisition, processing, communication and the like are difficult to support by the nodes of the Internet of things. Meanwhile, communication is still a main energy consumption link of the node of the internet of things. Even in low power wide area network technologies (e.g., loRa, NB-IoT), active transmission of radio frequency signals requires milliwatt level power consumption far beyond the continuous power supply capability of ambient energy harvesting. Therefore, reliable communication is realized under the condition of limited energy supply, and the reliable communication becomes a core challenge of a passive internet of things system. Environmental backscatter communication technology provides a breakthrough direction for this. According to the technology, data are encoded onto radio frequency carriers existing in the environment through the reflection characteristics of the intelligent modulation antenna, and signals do not need to be generated autonomously, so that communication power consumption is reduced to a microwatt level. However, the normal operation thereof still requires energy to drive the baseband control and modulation circuitry. Disclosure of Invention The invention aims to provide a double-function super-surface device applied to passive radio frequency energy collection and back scattering communication, which can realize the whole process self-energy supply from energy acquisition to information return. It is a further object of the invention to provide a backscatter communication system. The technical scheme adopted by the invention is as follows: The double-function super-surface device comprises three dielectric substrates passing through a positioning Kong Duidie, wherein each dielectric substrate is printed with a first metal layer, a second metal layer and a third metal layer which are sequentially arranged from top to bottom, the first metal layer is a first orthogonal grating structure loaded with a plurality of CMOS switches, the second metal layer is a phase modulation layer formed by a plurality of independently controllable resonance units, and the third metal layer is a second orthogonal grating structure, and the grating orientation of the third metal layer is mutually orthogonal with that of the first orthogonal grating structure. The invention is also characterized in that: The resonant cells in the second metal layer are of an I-type structure that provides a continuous phase modulation of 0 ° -360 ° by varying the cut angle and the rotation angle. The three layers of dielectric substrates are respectively Rogers RO4003 dielectric substrates with dielectric constants of 3.55. The super surface is formed into a planar array by periodically arranging 9×9 resonant units. The cut angle and rotation angle of the resonant cells are determined by their array coordinates to produce the radial symmetric phase distribution required for focusing. The three dielectric substrates are all FR4 boards, the thickness is 3mm-4mm, and the dielectric constant is 4.1-4.4. When the CMOS switch is turned off, the incident vertical polarized electromagnetic wave is converted into horizontal polarized electromagnetic wave transmission output through the first metal layer, the second metal layer and the third metal layer in sequence. The invention adopts another technical scheme that: The backscattering communication system comprises a double-function super-surface device applied to passive radio frequency energy collection and backscattering communic