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In this paper, we propose a new design of a dual-polarization near-field focused reflective metasurface for wireless power transfer. The reflective metasurface is composed of printed cross-dipole elements with different arm lengths, which is aimed to independently generate focused point with dual-polarization. Numerical simulations demonstrate that the proposed reflective metasurface can focus the...
On functional requirements of atmospheric particle monitoring system, this paper designs a distributed atmospheric particle monitoring system. The proposed system consists of a data acquisition network, embedded gateways, a database server and remote monitoring terminals. The data acquisition network consists of mobile data acquisition nodes and router nodes distributed in monitoring areas which are...
3-axis accelerometer is a widely adopted device for applications such as fall detection of the elders, kinematic analysis, building/bridge/landslide monitoring, and so on. To retrieve the sensing data in real time, one may use a wireless module to forward those data to a gateway or server. For outdoor applications, Zigbee/IEEE 802.15.4 technology is often the candidate because it is cost effective...
In this paper, a reflectarray is designed to generate an orbital angular momentum (OAM) vortex wave at 0.1THz. The elements of circular patch with different radii are introduced to design the reflectarray producing an OAM wave. The simulation results implied that the OAM wave can be effectively generated by reflectarrays in THz band. The proposed method may provide a new way to generate the OAM vortex...
Internet of thing (IoT) is not only a promising research topic but also a blooming industrial trend. One typical application is environmental sensing which is the basis of automation systems applied in home, factory, agriculture, disaster prevention/detection, and so on. To increase the serving area especially for outdoor scenarios, long transmission range is preferred, but this makes a sensor node...
This paper reports an experimental demonstration of a 32-Gbit/s wireless link using orbital angular momentum (OAM) and polarization multiplexing in a millimeter-wave regime at 60 GHz. Results of the analysis show that a higher carrier frequency reduces the propagation loss as well as the size of the transmitter and receiver, particularly for OAM channels with higher OAM values. Further, two different...
In this paper, a new miniaturized ultra-wideband (UWB) antenna fed by coplanar waveguide (CPW) is proposed. Gear-shaped structures are employed around the circular disc radiator to impove the current distribution for the antenna miniaturization. Moreover, the gear-shaped structures can produce a wide impedance bandwidth and miniaturization structure. The antenna exhibits a wider bandwidth characteristic...
In this paper, we present a kind of highly sub-wavelength negative refractive index metamaterials for operation at radio frequencies. A dual layer design consisting of planar spiral and meandering line with metallic strips enables the metamaterials with the properties of effective negative permittivity and permeability simultaneously, i.e. negative refractive index. Moreover, its cell size is about...
This paper analyzes the effects of coaxial cables in the magnetic resonant wireless power transfer (WPT) system. The experimental results show that the transfer efficiency of WPT system would change when different coaxial cables were connected to the source and load coils. Some special phenomena are revealed and a possible interpretation is proposed in this paper. Experiment results show that the...
In this paper, we propose a novel ultra-wideband planar inverse-F antenna (PIFA) using periodic metal patches ground plane. By applying the capacitive compensation for the input impedance of the PIFA in higher frequencies, the proposed PIFA has a working frequency band from 2.3 GHz to 9.0 GHz. The effect of geometric parameters of the periodic metal patches and antenna height on antenna performance...
A compact pattern reconfigurable quasi-Yagi antenna is presented. It consists of a driven element, which is simply realized by a microstrip monopole and only one parasitic element with four PIN diodes integrated on the arm. The effective electrical length of the parasitic element is controlled by changing the biasing voltages. This configuration allows two end-fire patterns with relatively high gain...
Security capacity improvement is always the implementation goal of physical layer security, which can be achieved by deliberate randomization based on differentia and uniqueness of wireless channels through signal processing method. An information-guided randomization secure transmission scheme is proposed combined with a spatial modulation system in which information can be carried by receiving antennas...
In this paper, a novel uniplanar compact EBG structure which integrates L-bridged EBG structure with slits is proposed for ultra-wideband GBN suppression in PCBs. The GBN suppression bandwidth is broadened to cover from 432 MHz to 15 GHz without using multilayer and cascading different period structures. The distinctive behavior of the new EBG power plane in ultra-wideband suppression of the GBN is...
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