With the optimization goal of improving transmission efficiency magnetically coupled resonant wireless power (MCR-WPT) system, influencing factors and suppression methods frequency splitting phenomenon (FSP) are analyzed from perspective input impedance based on mutual inductance model. Then we propose Monte Carlo-Interior Point method (MC-IPM) for nonlinear modeling to determine optimal system...

In addition to the electric field E(r), the associated magnetic field H(r) and current density J(r) characterize any electromagnetic device, providing insight into antenna coupling and mutual impedance. We demonstrate the optical analogue of the radio frequency vector network analyzer implemented in interferometric homodyne scattering-type scanning near-field optical microscopy for obtaining E(...

The frequency-dependent resistance and inductance can be calculated by solving an eddy current problem. In this paper, a model to describe such 3-D eddy current problem is proposed, which is called 3-D Omni-A model because both of the conducting and non-conducting regions are described in terms of magnetic vector potential A. Therefore, the induced voltages of the conductors may appear as the u...

Two eight-channel MRI receive-only coils were developed to provide whole-brain coverage at 1.5 T and 3.0 T field strength, respectively. Objectives were an image signal-to-noise ratio superior to standard designs throughout the human brain, as well as high parallel imaging performance. Electro-magnetic field simulations were used to determine array diameter and inter-element coil gap. Low mutua...

A mathemat ica l ana lys i s of the logar i thmica l ly per iodic d ipole class of frequency independent antennas, which takes into account the mutual coupling between dipole elements, is descr ibed. A h igh speed d ig i t a l computer (ILLIAC) is used t o c a l c u l a t e t h e i n p u t impedance gain, and bandwidth, a s w e l l a s t h e i n p u t c u r r e n t and vol tage of the several...

In this paper, a stacked ring-patch two layer planar artificial substrate is analyzed numerically and is shown to possess the properties of a high impedance surfaces (HIS). Its properties are evaluated by investigating the surface wave propagation and plane wave reflection characteristics. Its application to reduce the mutual coupling of microstrip antennas and to improve the radiation pattern ...

Abstract—This paper describes a wideband double-dipole Yagi-Uda antenna fed by a microstrip-slot coplanar stripline transition. The conventional dipole driver of a Yagi-Uda antenna is replaced by two parallel dipoles with different lengths to achieve multi-resonances, and a small, tapered ground plane is used to allow flexibility in the placement of a pair of reflectors for effective reflection...

This paper presents a novel impedance-based approach for out-of-step (OOS) protection of a synchronous generator. The most popular and commonly used approaches for detecting OOS conditions are based on the measurement of positive sequence impedance at relay location. However, FACTS devices change the measured impedance value and thus disrupt the performance of impedance-based relay function. In...

The wireless communication high data rate is achievable by installing more than one antenna in receiver and transmitter terminals as MIMO antenna. In order to obtain the MIMO gain (Envelope Correlation Coefficient (ECC) ≤ 0.5), the antenna elements must be at least separated by a distance of 0.5λ (λ is the operating wavelength of 0.7~3.8 GHz which is the frequency range of most of the current w...

Abstract We present a new reconfigurable broadband miniature antenna architecture that is able to change its working frequency, polarization, or radiation pattern to get single broadband or dualband behavior for a single widebeam or multibeam diversity configuration. Two antenna geometries are considered. A single element antenna, the socalled dime antenna, is introduced. A prototype dime anten...