The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This study proposes the metamaterial-like printed spiral coil (PSC) without using ferrite film to improve the proximity effect of metal plate in wireless power transmission. This four-PSC system is experimentally and theoretically verified by power transmission, impedance matching, resonant frequency, and magnetic field distribution. Results demonstrate that the transmission of the four-PSC system...
This paper presents a 3D computational model we have created to enable easier and more accurate analysis of the wireless power transfer (WPT) based on the magnetic resonance coupling method (MRC). The model enables time-efficient analysis of practical issues in the design of an MRC WPT system, such as: the optimal size of the MRC system on the transmitting (Tx)- or receiving (Rx)- side, the effects...
Wireless power transfer (WPT) via magnetic resonant coupling (MRC) proposed by a research team of Massachusetts Institute of Technology (MIT) in 2007 [1], has caused increasing interest in research and development of WPT technology. The WPT coils which are operated with the same resonance frequency are the core of the MRC-WPT. Until now, there have been two basic structures to implement MRC-WPT system...
In this paper, a new method of forming an UWB BPF with notch band functionality has been presented. The design uses a multi stub loaded resonator on a Uniform Impedance Resonator (UIR) to form an Ultra Wideband (UWB) range and a rectangular spiral resonator to form a notch band at 5.55 GHz to avoid interference from existing narrow band radio signals. The passband insertion loss is within 0.5 dB....
The performance of wireless power transfer (WPT) systems depends on antenna radiation efficiency and operating resonant frequency. In HF WPT systems, nearby objects have a certain impact on antenna characteristics and consequently on the WPT system performance. In this paper, human-WPT system interaction is investigated in order to provide basic recommendations regarding WPT system design and the...
This paper proposes a simple method for the analysis of the resonance frequency of a planar spiral coil used for wireless energy transfer via magnetic resonant coupling (Witricity), and illustrates an algorithm that was designed, through an advanced programming and computing software, to evaluate the lumped parameters of the coils.
A novel approach to decode information in a chipless RFID tag using signal space representation (SSR) is presented. SSR represents 2^b possible tag signatures of a b-bit tag as linear combinations of a small set of orthonormal basis functions. Each signature encoding a binary bit sequence is represented by a point in an $L$-dimensional constellation. Prototype 3-bit chipless RFID tags are used to...
A compact wireless energy transfer scheme for delivering power to the implantable electronic devices has been presented here. The wireless energy transfer system is built by using a printed spiral receiving resonator with a cylindrical source resonator to transfer energy wirelessly through strongly coupled magnetic resonance. Experimentally, it is found that the wireless power transfer efficiency...
A wireless sensor node based on a chipless RFID tag with integrated sensor element is presented. The chipless tag is multiresonator-based and encodes data as spectral signature. The sensor element is attached to a dedicated resonator of the chipless tag. Two types of sensor elements are used - resistive and capacitive. The resistive sensor output changes the Q factor of the spiral resonator effectively...
As an emerging technology of wireless power transfer, an electromagnetic resonant coupling technique, also known as witricity, has been widely discussed. In this paper, a prototype with square planar spiral structure based on witricity is proposed. To compute the resonant frequency, an equivalent circuit model is presented. The inductance is calculated based on Wheeler formula. The accuracy of the...
This paper presents the design, fabrication, and testing of a piezoelectric inertial micro power generator for scavenging low-frequency non-periodic vibrations. A mechanism up-converts the ambient vibration frequency to a higher internal operation frequency, in order to achieve better electromechanical coupling and efficiency: enhancing the generators performance at very low frequencies (< 30 Hz)...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.