Human body channel modeling method, terminal device and storage medium

Abstract

The invention relates to the technical field of human body channel modeling, and provides a human body channel modeling metho, a terminal device, and a storage medium. Based on the basic theory of electromagnetic wave propagation, Combined with the interface link conditions (boundary condition), a method for calculating the propagation characteristics of uniform plane electromagnetic waves is proposed, which includes the tangential equivalent wave impedance, reflection coefficient, transmission coefficient and the mathematical expressions of electromagnetic waves in each medium region. The method is used to calculate the propagation characteristics of uniform plane electromagnetic waves in multilayer media. It can be used to calculate the electromagnetic field distribution in any uniform plane wave incident at different angles on multi-layered conductive or non-conductive media and at different interfaces. the method enriches and supplements the incident propagation theory of electromagnetic wave, and provides a theoretical basis for the practical application of microwave and radio frequency.

Description

technical field [0001] The invention relates to the technical field of human body channel modeling, in particular to a human body channel modeling method, terminal equipment and a storage medium. Background technique [0002] At present, the existing human body channel modeling is mainly focused on wearable devices using current-coupled human body communication, which can be widely used in body area networks, especially in short-range wireless communications such as medical detection, sports monitoring, consumer electronics, and soldier monitoring. It has broad application prospects and market potential. For example, the invention patent with the application number 201410281066.2 proposes a method and system for modeling human body communication channels based on heterogeneous media. The human body is divided into multiple structural models according to the structure and the structural models are abstracted into regular geometric bodies. Layer division, set the thickness of...

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Problems solved by technology

These models are aimed at low-frequency (below 20MHz) body surface communication, and are not suitable for implantable devices that use radio frequency communication (international standards for implantable communication require frequencies above 400MHz)

[0003] Most of the research on the human body channel characteristics of implantable communication under radio frequency uses professional electromagnetic field software to simulate and calculate the loss of the entire human body channel between transceivers on digital human body models or multi-layer planar models. These studies cannot directly reflect the signals inside and outside the human body. Intrinsic mechanism of transdermal transmission, especially the inability to describe the propagation characteristics of signals at the interface of different tissues in the human body

In the prior art method of using a uniform plane electromagnetic wave to vertically incident the layered human tissue plane model, the electromagnetic propagation characteristics such as the reflection and refraction coefficient of the electromagnetic wave on the interface of each human tissue are theoretically calculated. Unfortunately, the vertical incidence is the incident propagation of electromagnetic waves. A special case of , not general

In addition, the existing theory of electromagnetic wave incidence mainly provides oblique incidence of uniform plane electromagnetic waves to a single non-conductive medium interface (two different non-conductive media, one interface) and vertical incidence to multi-layer different non-conductive media (multiple different non-conductive media). Non-conductive media, multiple interfaces), calculation methods such as reflection, refraction coefficient, etc., do not involve the oblique incidence of electromagnetic waves to multi-layer media (multiple conductive or non-conductive media, multiple interfaces), not suitable for the human body Channel Modeling of Multilayer Conductive Tissues

[0004] In summary, the existing human body channel models and research methods cannot correctly analyze the internal mechanism of electromagnetic waves propagating in multi-layered human tissues, that is, electromagnetic waves travel inside and outside human tissues under conditions of different frequencies, different angles of incidence, and different implantation positions. The transmission characteristics on the interfaces of different tissues are not yet clear, and cannot reflect the real situation of electromagnetic waves propagating inside the human body, and are not suitable for human body channel modeling of implantable devices

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