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A study of a rectenna (rectifying anntena) array on a 1×1-m substrate for RF energy harvesting is presented. Square loop antennas are laid out on the given substrate size assuming to harvest 500-MHz Digital TV radio waves. The optimum number of elements is determined from the obtainable DC power and its angle characteristics taking into account mutual coupling between antenna elements and the non-linear...
A 3×3 rectenna array for ambient RF energy harvesting was studied in terms of antenna element spacing and antenna type. The antenna types considered were a half-wavelength dipole and a loop antenna. To take into account the mutual coupling between antenna elements, the active element patterns for all the elements were calculated. Then, the patterns were used to estimate the combined DC power using...
This paper presents an experimental RF characterization for a proof of concept called "Electric Vehicle on Electrified Roadway (EVER)", where the energy is fed through dielectric coupling between a steel belt in a tire and a metal plate laid under the road surface. We first put a round aluminum plate of 1,000 mm in diameter directly under a tire whose inner surface is covered with a copper...
We herein propose power transfer through a capacitor composed of a steel belt in a tire and a metal plate attached to the road. In the present study, metal plates were arranged above and below a tire, and the complex impedance between these plates was measured. A matching circuit bridging the large impedance gap between the tire and 50-ohm lines was designed, and the transmission property was simulated...
After a giant magnetostriction was first found at a room temperature in early 1980s, there have been many applications proposed in a variety of fields. This paper introduces a novel application which is able to generate electric power by utilizing a reverse transduction of the material called Villari effect. The generator uses vibration as a power source which is commonly available in our daily life...
Performances of a presented X-band transparent wave absorber for an oblique incidence are clarified theoretically and experimentally. In the case of TE-polarization, the absorption of 20dB or more was obtained at the frequency between 9.1 and 10.5 GHz, and the incident angle between 0 and 40 degrees under the target frequency of 10GHz and the target incident angel of 20 degrees. In the case of TM-polarisation,...
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