Manufacture of Wireless Power Transmission Sheet using Printed Plastic MEMS Switches and Organic Field Effect Transistors

Introduction Wireless Power Transmission(WPT) is the process that takes place in any system where electric energy is transmitted from a power source to an electrical load, without interconnecting wires in an electric load. This could free cell phones, portable electronics from wired recharging. Moreover, it will lead to reduced reliance on batteries in some electronic devices. The best known example of transmitting power wirelessly is electromagnetic radiation in the form of radio waves. Such radiation is excellent for wireless transmission of information but it is very inefficient for power transmission. Radio waves spread in all directions, so a vast majority of the power from such a source would be lost to the environment. The most common form of wireless power transfer is carried out using Inductive Power Transfer. The first WPT experiment was carried out by Nikola Tesla at Wardenclyffe where he transmitted Alternating Current and was able to light lamps over 25 miles away without using wires. High frequency current of a Tesla Coil could light lamps filled with Ne. The most important breakthrough during World War-II came when scientists developed ability to convert energy to microwaves using magnetron. In 1964, William Brown demonstrated a rectenna which can convert microwave power to electricity. Ubiquitous Power Source Design with Microwave Power Transmission We propose a Ubiquitous Power Source(UPS) with Microwave Power Transmission (MPT). For this, we use only carrier of the microwave to transmit the power. Microwave means wireless power transmission via microwave, such as 2.45 GHz-Band and 5.8 GHz-Band as ISM Band. We bring a receiving system, rectenna instead of heavy battery. The safety level must be under 1mW per sq cm. for continuous all over the human body. Against the safety level, we would like to get higher power from the microwave. For the experiment, we have selected a magnetron and slotted antenna array for the transmitting system of the UPS. We use new rectenna array, receiving system for the microwave power transmission with higher efficiency under 1mW per sq cm microwave input. We adopted a Dual polarized antenna for the rectenna in order to

catch the microwave power from everywhere. The experiment will be done in the shielded room Design Target For carrying out laboratory experiment of the UPS, we set a design target as follows: 1. Frequency= in ISM Band ex. 2.45 GHz 2. Input Electric Power 1w 3. Keep Safety level(1 mW per sq cm) 4. Power density= Approx. Uniform 5. Economical System for promotion. We chose the MPT system with 2.45 GHz magnetron & Waveguide Slotted Antenna for the experiment. The UPS is a better system to generate stable electric power in any condition than the solar cell Estimation of Power Density level by FDTD Method Firstly we simulate the microwave power density in the shielded room by FDTD method. From the fig.1, the size of the room is 3.0 X 5.8 X 4.3 cm. and is shielded. From the antennas in edges of the ceiling, Transmitting System Fig:1 Concept of Ubiquitous Power Source we emit the 2.45 GHz CW microwave. If we don’t consider the power loss by air and the wall with conductor, the emitted microwave power will be accumulated and will be finally diffused. Therefore, we assume the power loss by air & the wall with conductor and estimate validity of the simulation. We conclude the simulation with loss leads valid results.