Abstract
Insufficient power supply is a huge challenge for wireless body area network (WBAN). Body channel wireless power transfer (BC-WPT) is promising to realize multi-node high-efficiency power transmission for miniaturized WBAN nodes. However, the behavior of BC-WPT, especially in the multi-node scenario, is still lacking in research. In this paper, the inter-degeneration mechanism of a multi-node BC-WPT is investigated based on the intuitive analysis of the existing circuit model. Co-simulation in the Computer Simulation Technology (CST) and Cadence platform and experiments in a general indoor environment verify this mechanism. Three key factors, including the distance between the source and the harvester, frequency of the source, and area of the ground electrodes, are taken into consideration, resulting in 15 representative cases for simulation and experiments studies. Based on the simulation parameters, an empirical circuit model to accurately predict the received power of multiple harvesters is established, which fits well with the measurement results, and can further provide guidelines for designs and research on multi-node BC-WPT systems.
Highlights
Today, more and more wearable devices are appearing, which collect health information, such as electrocardiograph (ECG), electroencephalograph (EEG), electromyogram (EMG), blood pressure, body temperature, and other vital signals, for utilization in health monitoring and medical diagnosis through a wireless body area network (WBAN), as shown in Figure 1 [1]
The difference between wireless power transfer (WPT) and wireless communication is that WPT is concerned with power efficiency, while wireless communication is more concerned with signal noise ratio (SNR) and sensitivity
The first subsection shows the implementations of Body channel wireless power transfer (BC-WPT), and the second subsection displays the experiment setup
Summary
More and more wearable devices are appearing, which collect health information, such as electrocardiograph (ECG), electroencephalograph (EEG), electromyogram (EMG), blood pressure, body temperature, and other vital signals, for utilization in health monitoring and medical diagnosis through a wireless body area network (WBAN), as shown in Figure 1 [1]. Due to the advantages of low transmission loss and no need for large antennas studied in the above researches, BCC can be used in power transmission through WBAN nodes. To provide a theoretical basis for simulation and experiments, the behavior analysis of BC-WPT is carried out. Based on CST and Cadence co-simulation platform, the multi-node BC-WPT is studied and the S-parameter model is simulated. The simulation results give the circuit parameters of the proposed empirical circuit model and investigates the inter-degeneration mechanism between multi-node received power. Based on the simulation parameters, an empirical circuit model of the received power of multiple harvesters in multi-node BC-WPT is established, which can fit the measurement results well. The behavior of the multi-node BC-WPT is first analyzed to provide a theoretical basis for simulation and experiments.
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