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Used as the transmitting and receiving elements, coils are the most popular elements for wireless power transfer. The parasitic coil or LC booster coil has been used as the part of the receiving element and reported to be effective to increase the wireless Power transfer efficiency so far. In this paper, the maximum transfer efficiency of the wireless power system by using parasitic coil will be calculated...
Wireless Power Transfer (WPT) is an attractive technology because it can supply power to IoT devices where battery replacement is difficult or the maintenance cost is high. Polarization Switching WPT antenna (PS-WPT antenna) is proposed in this paper. The polarization switching characteristic makes this design a good candidate for 5G-IoT sensors powered by using wireless power transfer. The 3GPP had...
In this paper, we presented a novel pixelated structure for electrode plates and initiate an innovative design of capacitive couplers for wireless charging. This research aims to improve the poor performance of traditional electrode plates in the literature when the plates are rotated 90 degrees. This research utilized optimization technique to design the distribution of the positive (and negative)...
Impedance matching is very important technique to improve the efficiency of transmitting or receiving system not only for wireless communication system but also for wireless power transfer(WPT) system. However, most lumped matching circuits have been designed by using reactive components such as inductors and capacitors without consideration of their ohmic losses. An exact approach to design the lumped...
Not only the wireless power transfer technology replaces the conventional cable electricity charging, but also is it strongly expected to feed the movement body which maybe a mobile phone or a driven car. In this report, a system of driving mini 4WD known as a small car model will be challenged to be fed by wireless power. Usually, mini 4WD is supplied by using 2 size AA batteries. But we put a receiving...
Numerical analysis of the near-field power transfer using multi-antennas is performed based on the scattering parameters for an equivalent circuit model of multi-port networks. The transfer power efficiency is derived by using the multi-port scattering parameters. Since the multi-port scattering parameters are easily measured by a vector network analyzer and calculated by a full-wave numerical analysis,...
Reflectarray is used as a passive reflector for improving outdoor radio channel in none-line-of-sight (NLOS) environment. The proposed reflectarray is designed with a 58-degree scattering angle and installed on the roof of a high building to eliminate blind spots and enhance MIMO performance. The performance and effectiveness in improvement of the receiving signal noise ratio (SNR) and channel quality...
A novel wireless power system called Via-Wheel Power Transfer (V-WPT) [1] [2] is expected to have significant advantages of long cruising, no charging time, and lightweight for Electric vehicles (EVs). However, to apply V-WPT systems to EVs there are lots of problems should to be solved, such as the problem how to get maximum efficiency by adjusting the matching circuit for the load, the safety problem...
Numerical analysis of the near-field power transfer for multi-user is performed by using the multi-port scattering parameters. The transfer power efficiency is derived by using the multi-port scattering parameters. Since the multi-port scattering parameters are easily measured by a vector network analyzer and calculated by a full-wave numerical analysis, it is convenient to investigate the relation...
Power transfer efficiency (PTE) of wireless power transfer (WPT) using near-field coupling of multi-antenna is numerically analyzed by using the scattering parameters after modeling the whole multi-antenna WPT system as a multi-port network. Because the multi-port scattering parameters can easily be measured by using a vector network analyzer and calculated by a full-wave numerical analysis, it is...
A planar dual-antenna system (DAS), composed of series-fed microstrip antenna and planar Yagi-Uda antenna, is proposed for blind spots elimination in mobile communication system. The planar DAS is developed as a reflector in a non-line-of-sight (NLOS) environment. Broad-angle scattering and polarization transition can be realized. Equivalent bi-static radar cross section (BRCS) is used to demonstrate...
A 42 × 44-element reflectarray using interdigital gap loading structure element is used as a passive reflector for elimination blindness propagation channel. The proposed reflectarray is designed with a 58-degree scattering angle and fabricated to experimentally investigate the performance and effectiveness in improvement of the receiving signal noise ratio (SNR) and channel quality. It was found...
A concept of modulated scattering antenna array (MSAA) is proposed based on the modulated scattering technique. The antenna array is composed of one regular antenna element and several modulated scattering elements (MSE). The regular antenna has its RF front-end circuit, but the MSA has not. The configuration of the array antenna is very simple because only one branch of the front-end circuit is required...
In mobile communication system, it is a serious problem that radio wave signal from base stations is blocked by the high and dense buildings in a downtown, high-building district, especially in narrow streets, which will result in a weak signal level and poor communication qualities, and this kind of areas are typically called blind spots. Many efforts were made in order to eliminate blind spots which...
A novel concept using non-uniform frequency selective surface (FSS) backed as a reflection plane for amplitude controlled reflectarray is proposed. First, a modified square-loop FSS element with broad reflection response band (from −22dB to 0dB) is designed. Then, a non-uniform FSS using the modified square-loop element is backed as a reflection plane for reflectarray. By properly controlling each...
A dual-antenna system (DAS) is developed as a reflector to improve the propagation channel of wireless communications in a a non-line-of-sight (NLOS) environment. The DAS includes a folded-patch antenna array, a power transmission network, and a plannar Yagi-Uda antenna. A 4-element array of the dual-antenna is evaluated by numerical analysis and experiment to demonstrate the performance and effectiveness...
Based on the transmitting efficiency of WPT system calculated by using s-parameters when the WPT system is equivalent to a 2-ports lossy network [1], the effects of human body on the transmitting efficiency of WPT system with three different transmitting/receiving elements are further investigated in this paper. It is found that the WPT system using the element consisting of loop and a parasitic helical,...
In this paper, a broad angle reflectarray is designed which can scatter the normal incident wave to a large angle (up to 60°) from the normal direction of the planar reflectarray to eliminate the blind areas of the base station in wireless communication scenarios. In our research, a novel individual element which is composed of a dipole with interdigital gap structure printed on a single-layer substrate...
The maximum transfer efficiency of WPT system with resonant transmitting/receiving elements and non-resonant transmitting/receiving elements has been analyzed and compared in this paper. It has been observed that the resonant characteristic of transmitting/receiving elements gives little impact on the maximum transfer efficiency when the receiving element is close to the transmitting element, but...
The dispersion relations of uniaxially anisotropic metamaterials (UAM) have been numerically investigated extensively, but their applications are still scarce. In this paper, a lens and a meta-reflector antenna made of the UAM are proposed and formulated, and design parameters versus different thickness or different incident/ deflected angles are given in details. Compared to the lens, the meta-reflector...
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