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Influences of user's posture and contact conditions of electrodes on the transmission characteristics of human body communication (HBC) were studied. A subject wore a transmitter on the left wrist and touched the receiver electrode with his right or left index finger. User's postures were selected from possible scenarios in practical applications. Electrodes of the transmitter and/or the receiver...
In this study, we focused on the human body communication between an electrode located on the floor surface and a wearable electrode located on the forearm, and their transmission characteristics were investigated. As a result, the transmission characteristics S21 between the electrode on the floor and that on the arm were −61.6 dB and −56.8 dB when the single or dual electrode for the wearable receiver,...
In this paper, a frequency dispersion of transmission characteristics of shielded-flexible printed circuits (FPC) for differential-signaling is studied experimentally and numerical modeling. Firstly, differential-mode impedance, the mixed-mode scattering parameters and eye-diagram are discussed. Secondly, frequency dispersion of transmission characteristics is discussed by using RLGC equivalent-circuit...
Recently, Near Field Communication (NFC) technology such as 13.56 MHz band-RFID has drawn a lot of attention as a short-range wireless communication technology for mobile and wearable devices. Although the NFC is a useful wireless communication within a few-centimeter area, it is not so convenient communication technology in the short-range from a few decimeters to meters. In this paper, in order...
In recent years, human body communication draws a lot of attention as a promising wireless technology in order to materialize wireless body area network for mobile and wearable devices. In this study, we focused on the communication between an electrode located on the floor surface and a wearable electrode located on the forearm, and electromagnetic field distribution and transmission characteristics...
In order to effectively solve the instable problem of wireless signal transmission in modern architecture, the scheme of using coaxial cable to transmit 2.4GHz wireless signal is proposed. Firstly, the feasibility of wireless signal which transmit in coaxial cable is analyzed and measured. Next, the former result is compared with the typical values of propagation attenuation of wireless signal spreading...
As a kind of large-power, single-phase and nonlinear load, the electrified railway produces a great deal of harmonic, which has a severe impact on the power quality in power system. In this paper, a set of practical indicators is put forward firstly, in order to analyze the transmission characteristics of the harmonics and negative sequence voltage and current in power network quantitatively. Secondly,...
We investigate the effectiveness of coarse and fine granular hybrid optical-path routing networks implemented with virtual direct links. Numerical and experimental evaluations show that our network control scheme can substantially improve the product of spectral efficiency and hop count compared to present single-granular networks.
Completely embedded sensor systems for long-term operation offer innovative possibilities for structural health monitoring of concrete structures. Measuring of relevant parameters, e.g., temperature, humidity, or indication of corrosion can be performed with low energy sensors. This allows to implement passive RFID sensor systems without cable connection and battery, which are power supplied exclusively...
Multi-phase magnetically coupled resonant (MCR) wireless power transfer (WPT) technology has attracted wide spread attention recently, for it can not only reduce the sensitivity of system to the spatial scale effectively, but also maintain the high transmission efficiency and power in the middle distance. This paper presented an analytical equivalent model for a three-phase MCR WPT system under phase...
This paper describes a dynamic method to measure the moisture content of grains such as rice and wheat. The proposed method does not require the value of bulk density or mass of the grains. Instead, it uses the attenuation and phase shift of the microwave signal through a microstrip transmission line. The static and dynamic measurements were performed for rice samples having different moisture contents...
Wireless power transfer system with single transmitter and double receivers are introduced and modeled. By comparing single receiving coil with double receiving coils (each receiver of double receivers is the same parameters as the singleload receiver) when the transmitter is the same one, transmission characteristics of system are analyzed with the method of equivalent mutual inductance circuits...
In recent years, the substrate which achieves low-cost manufacturing and high density wiring is strongly demanded for the next generation high performance computing. Therefore, we developed the process of micron-order wiring with printing nano-scale conductive particle. This process has two noble technologies. One is micron order trench forming and another is printing and sintering. In this time,...
Human body communication (HBC) is expected to become an increasingly important man-machine interface because a transmission path is established only when a user touches a target device. In this research, we investigated HBC between a stationary device touched by the palm or finger and a wearable device worn on the wrist. The transmission characteristics between the devices and the electric field around...
We investigate the performances of Grouped Routing which greatly mitigates the filter passband narrowing effect. Numerical experiments demonstrate that the optimal modulation format and channel spacing, considering the impairment by filtering effect and fiber transmission, can reduce the necessary number of fibers by up to 21.9%.
In microwave and millimeter wave frequency region, systematic error terms, i.e. directivity, matching and tracking, in vector network Analyzer (VNA) can be corrected by a calibration process. However, it is difficult to correct the other random error terms, i.e. connection repeatability and flexure influences of cables attached to test ports, etc. In the waveguide VNA using frequency extension modules,...
In geosteering drilling technology, the transmission of information measured by near-bit sensor has always been a problem. Downhole drilling tool is a very complex medium for sonic transmission. This paper takes geosteering drilling tool as the study object, and puts forward a method of short distance transmission, which is based on sonic wave transmission theory. The experiment testing the drilling...
Human body communication (HBC) is expected to become a unique man-machine interface because the transmission path is established only when the user touches the target device. In this study, HBC between a stationary device and a wearable device worn on the wrist was investigated. Transmission characteristics between the devices and electric field around the human body model were calculated by electromagnetic...
As UHF RFID technology is employed in all walks of life, the working environment of UHF radio frequency identification system is complex, the blocks between the reader and the electric tag is an important factor. Based on application, the radiation field is analyzed and compared using CST Microwave Studio under existence or absence of occlusion between the reader and the electric tag.
In this study, we investigated the electric field distribution and transmission characteristics between a stationary device and an arm-mounted wearable human body communication device including earth ground. The results showed that when the stationary device signal electrode is excited, the electric field distribution around the legs and torso becomes weak when there is an earth ground as compared...
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