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A novel optically transparent RFID reader antenna is proposed in this paper for smart fitting room application in clothing stores. This antenna uses Indium Tin Oxide film to achieve the optically transparent characteristic. It operates in the ultrahigh frequency (UHF) band and has circular polarization characteristic. The antenna can be integrated into the mirror surface of fitting rooms and read...
In this paper, we develop a novel file sharing system based on a mixture distribution model working in the BitTorrent-like p2p networks. The BitTorrent's built-in “tit-for-tat” unchoking mechanism delays the initial file sharing process for newly joined peers as well as brings the problem of free-riding that peers only download from others but never contribute to the network. We...
The crack-free and low surface roughness of Ta2O5 film has been deposited by magnetron sputtering technique. The propagation loss of 1.5 dB/cm with the total coupling loss of 3.2 dB for the Ta2O5 based channel waveguide with inverse taper structure has been successfully demonstrated.
In this paper, a new multi-degree-of-freedom (MDOF) ultrasonic motor is designed. The motor is composed of four rectangular vibrators which are arranged as the Chinese word ‘ten’. The stator is driven by a composite of bending vibrations in two orthogonal directions. In the design process, the finite element model is established to find the anti-symmetric and symmetric modes of the stator. Structural...
In this paper, a new type of micro droplet generation system is proposed. It is composed of the drive component (the linear ultrasonic motor and controller), the micro droplet generation component (the syringe and the catheter), signal generator and amplifier and the micro droplet separation (the Langevin vibrator and a cantilever beam). Utilizing the drive controller to drive the linear ultrasonic...
A 3-DOF micromanipulator driven by linear ultrasonic motors is proposed in this paper. Compared with the traditional micromanipulator based on static deformation of piezoelectric ceramics (high displacement resolution, micro-size motion range), this micromanipulator owns motion range in millimeter size (2 mm) while having high displacement resolution (50 nm). First of all, working principle of the...
This paper designed a hinged type beam clamping structure based on the characteristics of the Langevin-type transducer oscillator having obvious vibration node. The corresponding motor stator was developed based on the previous U-shape type linear ultrasonic motor. A simple mechanical model of the structure was established to analyze the effects of spring stiffness on the normal pressure and tangential...
Our daily life is more convenient than ever before because of the great progress of science and technology. However, the body building or fitness are always ignored in modern daily life. In this paper, we propose a Virtual Personal Trainer to provide real time visually action guide and action assessment during the fitness time of users via the Microsoft Kinect Sensor. The user actions are captured...
In this paper, the properties of graphene are studied and simulated. The phenomenon of graphene surface Plasmon propagation is verified by simulation. It is proved that graphene materials have wide application prospect in terahertz frequency band. The metamaterial graphene also have been used in the design of the reflectarray antenna in this paper. Through the design and simulation of the reflectarray...
This paper presents a novel tri-reflector compact antenna test range (CATR) to be working in the THz range. For the purpose of mechanical alignment, the quiet zone assessment is conducted using near field scanning technique in the F band (90–140 GHz). The preliminary results suggest that the system is well implemented. Future work will be conducted in the frequency range of 200– 325 GHz.
A tri-reflector Compact Antenna Test Range (CATR) system which operates at 300GHz is modeled and verified in this work. An efficient Gaussian Beam (GB) analysis method based on point matching expansion technique is proposed to evaluate the predicted quiet zone performance of the CATR system. Experimental result shows that the amplitude ripple within the quiet zone is less than 1.1dB while the phase...
This paper introduces a simulation software, named Simatrix, for designing millimetre-wave reflector antenna and transmission system based on Diffracted Gaussian Beam Analysis. DGBA is a fast and modularized method for quasi-optical system (QOS) analysis. The Simatrix offers the functionalities of modeling and simulating 3D asymmetrical QOS, designing systems which contain shaped-mirror reflectors...
A UHF RFID reader antenna for near-field applications is presented in this paper. The design is based on EM coupling between two open-ended microstrip meander lines. The corresponding currents flowing along the two microstrip meander lines are reverse direction with approximately identical amplitudes. The impedance bandwidth of the proposed antenna is 15 MHz, from 914 MHz to 929 MHz. The results show...
A tri-pin tri-mode corrugated matched horn with low side lobes is proposed to compensate the cross-polar component in high performance offset reflector systems. The simulated results are presented, showing that the cross-polar isolation in the offset tri-reflector compact range is improved from 30.5dB to 48.2dB when the proposed horn is used.
With the growing popularity of mobile devices (e.g., smart phones and tablet computers) and mobile apps (e.g., Line and WhatsApp), the volume of mobile data traffic increases tremendously. How to efficiently utilize the precious and scarce spectrum resource is a key problem for the next-generation wireless network, and full-duplex radio (FD) and device-to-device communication (D2D) provide insights...
Dedicated Short Range Communication (DSRC) protocol is a key enabling technology for enhancing road safety and transportation efficiency. Wireless Access in Vehicular Environments (WAVE) 1609.4 is a new amendment that enables multi-channel operations in DSRC. Operating intervals are divided into alternating Control Channel (CCH) Intervals and Service Channel (SCH) Intervals with an identical length...
A microcavity fiber-Fabry-Pérot-interferometer (MFFPI) based on dual hollow-core-fibers is developed to measure refractive-index (RI) and material dispersion of liquids. The measurement can determine the Sellmeier equation of liquids with picoliter volume in the near-IR region.
Continuous-wave terahertz digital holography system has been established using 3THz quantum cascade laser. Holograms with no object located in the object beam path are recorded sequentially in air and vacuum conditions. Comparison between the two holograms illustrates that hologram retrieved in vacuum exhibits high quality and contrast. Besides, characteristic parameters of the laser beam focused...
Two novel designs of compact circularly polarized (CP) monopole antennas are proposed and investigated in this paper. The first antenna, consisting of a printed L-shaped monopole and a tilted cross on the ground plane, exhibits 1.160∼2.042 GHz (55.10%) measured −10 dB impedance bandwidth, as well as 1.356∼1.637 GHz (18.78%) and 1.794∼2.487 GHz (32.38%) measured 3 dB AR bandwidths. Antenna 2 with a...
In order to correct non-uniform backgrounds in thermal images of carbon fiber-reinforced polymers (CFRP), we propose a processing and analysis procedure in this paper. We apply thermographic signal reconstruction (TSR) using time-direction information to reduce noise in thermal images, followed by Whittaker smoothing (WS) to further reduce noise in two-dimensional image space. Finally, polynomial...
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