Graphene circularly polarized wearable antenna based on artificial magnetic conductor array

Abstract

The invention provides a graphene circular polarization wearable antenna based on an artificial magnetic conductor array, belongs to the technical field of antennas, and aims to realize the circular polarization characteristic of the wearable antenna and improve the gain of the antenna on the premise of ensuring light weight and low specific absorption rate. Comprising a circularly polarized radiation unit, a second flexible medium supporting layer and an artificial magnetic conductor array reflecting plate which are sequentially stacked from top to bottom; the circularly polarized radiation unit comprises a first dielectric flexible substrate and a graphene film feed floor printed on the upper surface of the first dielectric flexible substrate, an open rectangular gap is etched in the feed floor, and an L-shaped radiation patch is printed in the gap; the artificial magnetic conductor array reflecting plate is composed of a plurality of artificial magnetic conductor units which are periodically arranged, and each artificial magnetic conductor unit comprises a third dielectric flexible substrate, a square annular patch of a graphene film printed on the upper surface of the third dielectric flexible substrate and a square floor of the graphene film printed on the lower surface of the third dielectric flexible substrate.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a circularly polarized wearable antenna, in particular to a graphene circularly polarized wearable antenna based on an artificial magnetic conductor array, which can be used in a wireless body area network communication system. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the human-centered wireless body area network (WBAN) communication system has become an important part of short-range wireless communication, which is mainly used in medical and health monitoring and other fields. As the terminal equipment of wireless body area network communication system, wearable electronic devices play a crucial role in the reception and transmission of signals. The reception and transmission of signals in wearable electronic devices depend on antennas. In order to meet the requirements of human communication technology, weara...

AI Technical Summary

Problems solved by technology

For the antenna in the form of a monopole, its structure is simple and it is easy to achieve broadband, but this type of antenna has strong back radiation, and it is impossible to isolate the antenna from the human body, which will lead to an excessively high specific absorption rate. Does not meet international electromagnetic radiation safety standards

A wearable antenna in the form of a microstrip can isolate the antenna from the human body, but the bandwidth of the microstrip antenna itself is narrow, and the deformation in the bending state will cause the shift of the resonant frequency of the antenna and the distortion of the radiation pattern, and the general gain of this type of antenna is not tall

Wearable antennas with monopoles combined with metamaterial structures can ensure the isolation of the antenna from the human body and maintain good performance under bending conditions. placement of

[0004] In November 2019, Xidian University, Wu Bian and others applied for a patent "Circularly Polarized Wearable Antenna Based on Graphene Flexible Conductive Film", the application publication number is: CN 110444894 A, the invention discloses an anisotropic Graphene film circularly polarized wearable antenna with artificial magnetic conductor structure, which uses a linearly polarized radiation unit and artificial magnetic conductor to modulate the electromagnetic wave of the antenna to achieve circularly polarized radiation. At the same time, the antenna has a low profile and low specific absorption rate. characteristics, however, the gain of this antenna is slightly lower, and its maximum gain is 6dBi

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