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An improvement equivalent circuit method (ECM) for analyzing finite and curved frequency selection surface (FSS) is proposed in this paper, double-square-loop FSS has been used in the curved FSS and the transmission coefficients of both TE and TM models have been analyzed by the ECM and full wave method. It has been shown that the improvement ECM has saved computational time in designing curved FSS,...
A methodology to measure and to demonstrate the impact of the PWM duty cycle jitter on the power conversion efficiency is proposed. The equivalent circuit model with corresponding equations is developed to determine the power loss mechanism. An automatic measurement system without thermal drift is established to verify the converter's efficiency drop.
A novel frequency selective radome (FSR), which is “transparent” within the operating band of the antenna while absorbing out-of-band incoming waves in a very wide band, is presented in this article. In order to absorb undesired signals out of the band, square loops loaded with lumped resistors are used. The pass-band property is realized by employing meandering square slots with a smaller period...
The dipole antennas are widely used for RF communication applications and usually provide a potential front-door path of coupling electromagnetic pulse (EMP). In this paper, the transient current response of dipoles exposed to EMP is calculated with an equivalent circuit based model, which consists of an equivalent pulse voltage source and an antenna equivalent circuit. A center-driven wire dipole...
Miniaturized combined-element frequency selective surfaces (CEFSSs) for tri-band applications are proposed using complementary structures. The three pass-bands of the proposed structures can be designed independently, which makes the design process much easier and more flexible than traditional tri-band FSSs. Besides, comparing to former designed combined-element FSSs, the structures proposed in this...
A new UWB tightly coupled antenna array is presented. In traditional antenna design, the distance between array elements is considered carefully to reduce mutual coupling effect, however coupling is not only desired but also enhanced and adjusted to increase array bandwidth in this new array. The equivalent circuit model of dipole array above a ground plane is discussed and its input impedance is...
In this paper, Modified T equivalent circuit has been developed for impact the area of transmission line of PCB(Printed Circuit Board). Sometimes in order to tune phase, transmission line commonly occupies a large area which can't be easily decreased. To finish effective delay, PCB often need to draw a large section of transmission line. Conventional RLCG model of transmission line has been instead...
Single-sided linear induction motors (SLIMs) have lately been applied in transportation system traction drives, especially in the intermediate speed range. They have merits such as the ability to exert thrust on the secondary without mechanical contact, high acceleration or deceleration, less wheel wear, small turning circle radius and flexible road line. The theory of operation for these machines...
This paper presents an analysis and optimal design of a capacitor-driven inductive coilgun. The electromagnetic FEA model of the capacitor-driven inductance coilgun is established and simulated by using Ansoft. In order to speed up the optimization, an equivalent circuit is designed for simulation of the performances of coilgun. A piece-wise model of projectile is built to account for the eddy current...
This paper presents the development of a permanent magnet motor with soft magnetic composite (SMC) stator core for driving a dishwasher pump. The unique properties of the SMC, such as 3D magnetic isotropy and molding production technique, have been taken into account in the design. 3D magnetic field finite element analysis is carried out to accurately compute the motor parameters and an equivalent...
Several optimal design schemes of a single-sided linear induction motor (SLIM) adopted in linear metro are presented in this paper. Firstly, the equivalent circuit of SLIM fully considering the end effects, half-filled slots, back-iron saturation and skin effect is proposed, based on one-dimensional air-gap magnetic equations. In the circuit, several coefficients including longitudinal end effect...
This paper investigates the control of doubly-fed induction generator (DFIG) based wind farms for compensating voltage unbalance in weak networks. A DFIG system model containing the generator and its back-to-back converters suitable for analyzing system operation under unbalanced conditions is developed. A control strategy for compensating grid voltage unbalance using DFIG systems is proposed. The...
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