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A phased array with 1.5kW microwave output power has been developed and tested. Mitsubishi Electric Corporation and Kyoto University jointly developed this for the purpose of basic experiments of high accurate microwave power transmission. To realize this purpose, REV method as a calibration system of the complex electric field of an antenna element and software retro-directive system as a power receiving...
This paper describes the demonstration of ICA (Independent Component Analysis) processor for radio applications. ICA determines the weighting vector of the array antenna to eliminate undesired arriving signals without any teaching signals. We believe that the ICA is useful to DOA estimation of the pilot signal from the Earth. In order to reduce dissipation power and to achieve higher processing speed,...
In recent days the demand for saving energy consumption is increasing day by day. HEMS is expected as one of the useful technology to satisfy that demand. Though it is understood useful and used on some situations, it has not prevailed well into the public. The reason is considered to be high initial cost of the equipment, low mobility of the system and regrettable unconcern for saving energy. In...
We developed a fundamental testbed and investigated the suitable transducer for the wireless power transmission (WPT). We also reported experimental results of the transmission efficiency in water by using the commercial transducer (COM) which only designed to match to the acoustic impedance of water and the electric impedance of the transmitter and receiver. In this paper, we investigate the transducer...
It is very challenging to improve the power conversion efficiency (PCE) in wireless power transmission (WPT), especially through the propagation channel of biological tissue. The received power for biomedical applications is usually very weak due to the security regulations of Specific Absorption Rate (SAR) and the propagation attenuation by biological tissues. So the input power (PIN) of the RF-DC...
A high-power millimeter-wave (MMW) beam transmission system for microwave beaming propulsion were designed and tested. For quasi-optical beam launcher, a couple of offset parabolic mirrors were applied and large diameter beam was produced for beam transmission. In the thruster, power density of the MMW beam increased to drive the shock wave by MMW plasma using an on-board beam converter. Finally the...
An air-breathing pulse-detonation engine powered by microwave energy beaming, “Microwave Rocket” is considered as a future mass transportation system to space. A key to realize Microwave Rocket is to achieve high air-breathing performance. We are now developing the system using side-wall reed valves which is expected to minimize ventilation period. A test chamber equipped with a reed valve was fabricated...
By focusing a high-power millimeter wave beam generated by a 170GHz gyrotron, a breakdown occurred and a shock wave was driven by plasma heated by following microwave energy. The shock wave and the plasma around a focal point of a parabolic thruster were visualized by a shadowgraph method, and a transition of structures between the shock wave and the plasma was observed. There was a threshold local...
We develop electrical functional models of the space solar power system (SSPS) for the system study and the practical demonstration of the end to end capability from space to the ground. The model generates electricity by the solar array and converts the DC power into microwaves with a frequency of 5.8 GHz. The microwave beam is controlled in one dimensional direction by the pilot signal and the phase...
In this paper, a high-efficiency wireless energy transmission via magnetic resonance is experimentally implemented in a resonator with the various sizes of transmitting and receiving coils and the receiving coil having two shapes of rectangular and circular types. The transmission efficiency is analyzed by varying the transmission distance. The resonance between the transmitting and receiving coils...
In this paper we propose a proximity power transmission system using one-dimensional (1D) thin waveguide. In the system the receiver device can extract microwave power from the ribbon waveguide through a bar-type coupler that resonate with high quality factor (high-Q). Due to the high-Q requirement, the system enables selective power transmission to the special receiver and prevents other objects...
We design and characterize a two-dimensional sonic crystal (SC) to manipulate the propagation of acoustic waves by numerical simulation based on the finite-difference time-domain (FDTD) method and by ultrasonic measurement. Two types of SC for an acoustic lens effect are studied. One is a homogeneous periodic structure exhibiting negative refraction, and the other has a hetero-structure. Negative...
A WPT design method by oscilloscope measurement is shown. Because a WPT system can be designed based on the BPF design theory, the resonant frequency, unloaded Q, external Q and coupling coefficient k of coupled resonators are the key parameters. Though they are usually measured by use of a vector network analyzer (VNA) in terms of S parameters, the present paper reports that these parameters can...
In this study, we investigated the influence of a high-frequency electromagnetic field (HFEMF) at 2.45 GHz on PC12VG cells neurite outgrowth in vitro. We studied the average length of neuritis, the longest neurite length and the percentage of neurite-bearing cells cultured for 7 days after exposure to HFEMF at average specific absorption rates of 1 and 10 W/kg for 4h. Our results suggest that exposure...
We numerically studied the affect of power loss factors in a wireless power transfer system using resonant magnetic coupling. Resonant magnetic coupling is regarded as one of the most promising methods for mid-range wireless charging systems. To make this method practical, it is important to accurately estimate power transfer efficiency and effect of each loss factor in the device-designing stage...
For shaping a beam of millimeter-wave reflectarrays arbitrarily, this paper proposes a directivity synthesis based on the algorithm of the phase-retrieval method. The unknown phase distribution is numerically determined from an illumination distribution on the aperture and a desired beam pattern by iterative approach. As a design example, we present an elliptical-beam microstrip reflectarray with...
SSPS (Space Solar Power System) consists of many phased array antenna panels in space. The panels are large and light weight, so the panels are flexible structure. Therefore, there is a possibility to emit unexpected microwaves. To resolve the problem, MHI (Mitsubishi Heavy Industries, Ltd) has developed two types of high accuracy phase control methods. The first is ‘PAC (Position and Angle Correction)...
The Japan Aerospace Exploration Agency and the Institute for Unmanned Space Experiment Free Flyer are planning to conduct a microwave power transmission (MPT) ground experiment in fiscal year 2014. We will use an important MPT technology called beam steering control (BSC). The BSC technology accurately controls microwave beam pointing to a power receiving subsystem. We researched the BSC method and...
In recent years, high-resolution Direction of Arrival (DOA) estimation with an array antenna has become indispensable for various applications such as microwave-power transmission and reception. In actual measurement, however, DOA estimation accuracy is deteriorated by many error factors. Furthermore, almost all the computationally efficient DOA estimation algorithm can apply to the uniform arrays...
A procedure to calculate parameters of an equivalent circuit of the magnetic-coupled resonant wireless power transfer is discussed. Equivalent circuit parameters are calculated from the mechanical and material parameters of the wireless power transfer structure. Both direct-fed type and indirect-fed type structure are considered. MoM calculation shows that the equivalent circuit has capability to...
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