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This paper reports on a signal-propagation loss through two human bodies in wearable-to-wearable intra-body communication. We investigated the signal propagation through two human bodies for expanding the two-person intra-body communication services. We estimated a detected signal power through human bodies was obtained by an experiment and simulation. The detected signal power through two human bodies...
Well logging technology is of great significance to oil production. A new lateral resistivity logging-while-drilling (LWD) method applied in oil-based drilling fluid condition is proposed in this paper by combining capacitive coupling with inductive coupling principle. By using a new logging model, the ineffectiveness of the conventional resistivity LWD methods in oil-based drilling fluid is overcome...
This paper presents an analysis of effect of external load on hemispherical resonator gyroscope (HRG) feedback control system with state constraint. Firstly, the analytical solution of dynamic equation under multi-electrode excitation is obtained based on dynamic equations of resonator in the second-order resonant state. Through analysis, two main reasons that external load influences feedback control...
The actual way of living is characterized by a large use of connected terminals and devices. This connectivity needs permanent intercommunication between terminals and requires miniaturization, power management, and intelligence. In this context, Human Body Communication (HBC) is an emerging and promising communication technique of Body Area Network (BAN) which enshrines these requirements. HBC is...
In this paper, a capacitive rotary encoder for contactless angle measurement is presented. The encoder includes a rotor and a stator. The rotor is composed by a coupling electrode and a sensitive electrode and the stator is mainly composed by an excitation electrode and four collection electrodes. A high frequency sinusoidal voltage is acted on stator's excitation electrode to offer a carry voltage...
An efficient semi-numeric boundary element method for the calculation of the response of interdigitated touch sensors is introduced and used to demonstrate interesting properties of embedded printed capacitive touch sensors on steel substrates. The strength of the method is that layer compositions with finite conductivity and arbitrary sequence of layer permittivities can be calculated efficiently...
A piezoelectric plate, poled along its thickness, that supports on its top surface a periodic grating of electrodes is considered. If wave propagation is assumed along the length of the plate, one demonstrates that an electrical Bragg band gap can be observed, depending on the electrical boundary conditions applied on the electrodes. This gap is associated with a discontinuity of the electric field...
Suppression of the SH-SAW response is mandatory to design TC SAW devices on θ degree rotated Y-cut LiNbO3. However, it is not easy because K2 for SH SAW changes rapidly with θ, and its optimal value in terms of the SH-SAW suppression is dependent on electrode and SiO2 thicknesses. The authors found that the optimal θ always locates close to θ where difference in velocities of two SAWs is minimum....
Lithium niobate (LN) based thin film piezoelectrics have being extensively explored [1-3] for the making of high coupling and high performance resonators. The most important bottleneck for the use of LN film is related to fabrication process and it is particularly challenging when a bottom electrode is included in the stack to increase the film capacitance per unit area. We have explored Y-cut LN...
The most important bottleneck for the use of lithium niobate (LN) films for making MEMS resonators is related to the fabrication process and it is particularly challenging when a bottom electrode needs to be included in the film stack to increase the resonator's capacitance per unit area. In this work, we propose to access the bottom electrode by using capacitive coupling rather than a direct resistive...
This paper studies a capacitive coupling wireless power transfer (CCWPT) for charging electric vehicles by using the dielectric substrate outside of a vehicle. The CCWPT can replace a conventional inductive coupling wireless power transfer because it has less electro-magnetic interference (EMI) and heat dissipation. However, since the CCWPT has limitation on transferring high power due to too small...
Recent literature has focused on improving piezoelectric coupling coefficients by alloying aluminum nitride (AlN) with scandium (Sc). Akiyama et al. showed the highest piezoelectric coefficient increase of nearly four times for a 41% Sc substitution for Al. Thus far, studies mainly focus on material measurements such as x-ray diffraction or piezoelectric constants to assess the material quality. Although...
HF RFID transponders with capacitive coupling were made. They have two electrodes for capacitive coupling instead of a coil for magnetic induction coupling. Prototypes of capacitive coupling transponder communicate via a medium composed of conductors and/or dielectrics normally existing around us. In HF band, since the human body is also a conductor and a dielectric, RFID communication can be carried...
Recent literature has focused on improving piezoelectric coupling coefficients by alloying aluminum nitride (AlN) with scandium (Sc). Akiyama et al. showed the highest d_33 piezoelectric coefficient increase of >4x at a 41% Sc substitution for Al. Thus far, studies mainly focus on material measurements such as x-ray diffraction or piezoelectric constants to assess the material quality. Although...
The piston mode operation (PMO) is quite effective for realization of spurious-free and low-loss SAW resonators. The scalar potential (SP) analysis indicates that “phase shifters” are necessary for PMO at edges of the acoustic aperture. Nakamura, et al., pointed out that for SAW resonators using SiO2/LiNbO3 structure, PMO is possible by simply removing SiO2 in the dummy electrode region [1]. This...
The paper considers WBAN and intersegment WBAN communication approaches. At present, WBAN is rapidly developing. So, it's necessary to study not only WBAN standards and technologies, but also WBAN to WBAN interaction, especially using IBC. In this work the IEEE 802.15.6 standard is considered, BodyCom technology has been studied. Practical tasks that can be solved by IBC WBAN intersegment communication...
This paper presents a 3.5 GHz aluminum nitride (AlN) microelectromechanical system (MEMS) resonator. The high frequency resonance is attained by exploiting the high phase velocity S1 Lamb mode in an AlN thin film. Finite element analyses (FEA) are employed to show a high phase velocity larger than 50000 m/s and a large electromechanical coupling of 3.6% for S1 when hAlN=0.1λ. As predicted by the simulation,...
This paper presents an inexpensive, low temperature and rapid fabrication method for capacitive micromachined ultrasonic transducers (CMUT). The fabrication utilizes the bonding and dielectric properties of the photosensitive polymer Benzocyclobutene (BCB). A BCB based row-column addressed CMUT with integrated apodization has been fabricated and characterized with initial impedance measurement. Furthermore,...
Phononic crystals have attracted intensive research interest for decades since the early 1990s. They exhibit a spatially periodic feature regarding the distribution of physical properties, geometry, boundary conditions, or/and external stimuli, making their wave spectrum quite different from the conventional continuous one, usually with frequency band gaps where waves cannot propagate through them...
Episodic memory is a conglomerate of autobiographical events, times, places, associated emotions, and other contextual who, what, when, where, why knowledge that can be explicitly stated. It is the collection of past personal experiences that occurred at a particular time and place. An emotion plays a pivotal role in the formation of memory; it can either enhance memory or impair cognition. Memory...
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