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Based on the theoretical formulation of the electromagnetic field distributions within a square patch resonator, an equivalent circuit and corresponding coupling model of the patch resonator for dual-mode filter operations are first constructed. Then, a circular hole (called as a perturbation element) etched on the patch itself with symmetric or antisymmetric to the excitation ports is studied. Further,...
A magnitude and frequency control (MFC) strategy has been proposed for a doubly fed induction generator (DFIG). The proposed MFC is to make the DFIG equivalent to a synchronous generator in power system. It is found that the stator active and reactive powers depend on the phase and magnitude of the internal transient electro-magnetic field (EMF). The relationship between the rotor voltage and the...
In order to improve the reading distance of portable RFID system effectively, the relationship of tag activating distance and transmitting power of reader is particularly analyzed and proved by experiment in this paper. A method for piecewise amplifying signal is proposed by analyzing the action of consumed power of tag and the reader's minimum receiving power.
Electromagnetic bandgap (EBG) material is applied in the design of reflectarray, hoping that the surface-waves could be suppressed by the frequency bandgap, and therefore, the mutual couplings between different elements in the reflectarray could be greatly reduced. To testify the benefits of the importing EBG, the phase adjusting characteristics of the array element with slots on the ground as well...
The near-field scattering characteristics of an electrically large metallic plate changing with the position of the local illumination source are reported in this paper. The local illumination source is described by a spherical wave weighted by source radiation pattern. For a narrow incident beam, it is assumed that the incident field is approximately linearly polarized. The electric field integral...
An unconditionally stable time-domain method with reduced grid size is proposed to deal with Maxwell's differential equations. The proposed method uses Yee's finite difference scheme in the space domain, and expands electromagnetic fields in a series of basis functions and treats them in a moment method procedure in the time domain. We use triangle basis functions and Galerkin's testing procedure...
The electric field integral equation (EFIE) is used with the method of moments to analysis the scattering characteristics of perfect conductor that is partly illuminated by an electromagnetic wave beam. The incident beam is described by a spherical wave weighted by source radiation pattern. For a narrow incident beam, it is assumed that one of the incident field components can be neglected. Numerical...
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