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Solar Power Satellite (SPS) is an energy system which collects solar energy in space and transmits it to the ground. It has been believed as a promising infrastructure to resolve global environmental and energy problems for human beings. One of the most important technologies for the SPS is the wireless power transmission from the geostationary orbit to the ground. Microwave power transmission has...
Several researchers have examined the extent of genetic damage in mammalian somatic cells exposed in vitro and/or in vivo exposure of extremely low frequency (ELF) and radiofrequency (RF) electromagnetic fields. A meta-analysis of all data reported for chromosomal aberrations in human and animal cells during the last several years (1990–2007 for ELF and 1990–2005 for RF) was conducted to obtain a...
A Rectifying Antenna (Rectenna) is one of the most important components for a wireless power transmission. It has been developed for many applications such as Space Solar Power System (SSPS), and Radio Frequency Identification (RFID) etc. The Rectenna consisting of RF-DC conversion circuits and receiving antennas needs to be designed for high conversion efficiency to achieve efficient power transmission...
This paper presents the 5.8 GHz high sensitivity rectenna array with advanced microstrip-type rectifiers and circularly patch antennas achieving a good balance between a high-efficiency and RF weak power operation. The fabricated rectenna element has achieved RF-DC conversion efficiency of 54% at input RF power of 1mW. Furthermore, we have proposed the novel structure which enhances robustness to...
This paper introduces an improved detector topology which is used to design the rectifier that is a part of a rectenna, operating in the S-band. Our proposition adds a third diode into the conventional half bridge detector, leading to improve the output DC voltage and to reduce the harmonics power level. Then, a rectifying circuit is built using two approaches. The first rectifier is based on a HSMS2822...
Class-F and inverse class-F load circuits that can be treated up to arbitrary harmonics have been presented. The class-F and inverse class-F load circuits are designed so that influence of parasitic elements at a transistor is compensated. By using distributed circuit elements, the class-F and inverse class-F amplifier can operate at C-band. The design method mainly for the inverse class-F load circuit...
Open-ring resonator coupling is used for the wireless power transmission through 1.6mm thick epoxy-glass plate. Microwave signal is emitted from one circuit board where an open-ring resonator is placed and the signal is received by another board with also an open-ring resonator and GaN Schottky barrier diode. At 2.3 GHz, RF to DC conversion efficiency of 37.1 % is obtained at the input power of 3...
A GaN Schottky diode using Zr/Al/Mo/Au metal stack for Schttky contact has been newly developed. Turn-on (Von) and breakdown voltages (Vbr) are controllable with varying the annealing temperature. The fabricated diode shows the values Von, series resistance (Rs), capacitance (C0), and Vbr to be 0.42 V, 4.2 Ω, 1.0 pF, and 24 V, respectively. These values indicate that 85% conversion efficiency is expected...
In this paper, a GaN HEMT high efficiency amplifier and a module composed of a GaN HEMT amplifier are presented, which operates at 5.8GHz. GaN HEMT is considered to be suitable for harmonic tuned high efficiency amplifiers compared with existing GaAs FET amplifiers, due to its high voltage operation and high impedance natures. A high efficiency GaN HEMT amplifier is designed and evaluated, which is...
Institute for Unmanned Space Experiment Free Flyer, USEF, has been studying Space Solar Power System, SSPS, as future electricity alternative energy source since 1990s. From 2009, USEF started research and development project of Microwave Ground Wireless Power Transmission under a support of Ministry of Economy, Trade and Industry, METI. This project plans to test ground wireless power transmission...
A microwave power beaming system was developed to realize wireless power supply to a Micro Aerial Vehicle. This system consists of transmitting, tracking, and receiving systems. In the transmitting system, a 5.8GHz microwave beam was irradiated from an active phased array antenna. Transmitting power was 4W and the beam divergence angle was 9deg. In the tracking system, a 2.45GHz pilot signal was detected...
This paper applies UWB technologies in a special aspect for the transmission of energy rather than messages to achieve a novel wireless impulsive powering approach and enhance the power conversion efficiency (PCE) for low average input power. The whole impulsive wireless power transmitting and receiving systems are implemented to validate the feasibility of the wireless power transmission (WPT) using...
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