in this paper, shielding effectiveness (se) of a perforated enclosure with imperfectly conducting walls is evaluated. to this end, first, an accurate numerical technique based on method of moments (mom) ispresented. in this method, lossy metallic walls of the enclosure are replaced by equivalent electric surfacecurrent sources. then, the impedance boundary condition on the imperfectly conductin...

We investigate the properties of nonlinear envelope pulses developed in a coupled composite rightand left-handed (CRLH) transmission line with regularly spaced Schottky varactors. It is found that the dispersive distortion of the envelope pulses carried by each mode is well compensated by nonlinearity introduced by the varactors. In addition, we numerically observe that the collision of two non...

An improved composite right/left-handed (CRLH) unit cell optimized for a leaky-wave (LW) antenna is presented. This CRLH cell consists of a series of one transmission line, an interdigital capacitor, another transmission line and a shunt shorted stub. Introducing the transmission lines, the parasitic self-resonances of the capacitor are shifted outside the operational band, the radiation range ...

Abstract Out-of-step oscillation separation devices based on apparent impedance angle trajectory are widely used in the power grid China, and their reliability is of great importance. In this paper, influence mechanism series compensation analyzed. It reveals that capacitors reduce equivalent consequently cannot pass through all four zones, resulting risk failure for devices. A revised method p...

A method for design and implementation of a compact via-less Composite Right/Left-Handed Transmission Line (CRLH TL) is presented. By introducing a new circuit model, the CRLH transmission line behavior is studied versus the parameters variations to achieve the desired characteristic impedance and electrical length. Then a compact quarter wavelength CRLH transmission line with 70 Ω characte...

A conceptual method to realize an impedance-matched electrically small antenna is discussed, using a transmission line modulated only in time. The time-periodic space-uniform modulation of distributed shunt array varcapacitors excites mode with very frequency but still (microwave) wavelength: the matching then retains practical size. brings problem impedance $f_0$ much higher than signal, where...

The series capacitor compensation is one of the key technologies in the EHV and UHV long distance power transmission lines. This paper analyzes the operation characteristics of the main protection combined with the engineering practice when the transmission line overcompensation due to the series compensation system is modified and analyzes the influence of the transition resistance and the sys...

The unified power flow controller (UPFC) is one of the most promising flexible AC transmission systems (FACTS) devices for the power flow control. The main objective of power flow control for UPFC is to improve the power flow distribution and increase the transmission capacity over the existing transmission corridor or line. This paper presents a practical engineering methodology of embedding t...

The quality of experience (QoE) requirements wireless virtual reality (VR) can only be satisfied with high data rate, reliability, and low VR interaction latency. This rate over short transmission distances may achieved via the abundant bandwidth in terahertz (THz) band. However, THz waves severe signal attenuation, which compensated by reconfigurable intelligent surface (RIS) technology progra...