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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,...
The equivalent circuit model parameters of the barrel-stave flextensional transducer and array are calculated using the circuit principle together with the finite element, boundary element method and the measured results. The electro-acoustic characteristics of the transducers and arrays are analyzed by the obtained equivalent circuit model. The resonant frequencies and admittance curves of the transducers...
Large-scale multi-frequency capacitive micromachined ultrasonic transducer (CMUT) arrays consist of thousands of closely packed interlaced large and small membranes for applications such as super-harmonic imaging, multi-band operation, imaging-therapy, contrast and photoacoustic imaging. An accurate nonlinear lumped equivalent circuit model including the effects of the self and mutual acoustic interactions...
This paper deals with deep bar effect in squirrel cage rotors. Induction machines using this type of rotor are widespread. Some cages enhance the deep bar effect to improve the starting performances. In cited references, the analytical calculation of the equivalent circuit parameters has only been investigated for single-cage and double-cage rotors. In this paper, an analytical model is developed...
Equivalent Circuit (EC) method gives a simple alternative method in Frequency Selective Surface (FSS) analyses which are useful for quickly predicting the characteristic of FSS. An impedance modeling of the Equivalent Circuit (EC) for a unit cell of the square loop FSS structure is presented in this paper. The unit cell of the square loop FSS is designed and simulated using the CST Microwave Studio...
We use an accurate nonlinear equivalent circuit model to analyze CMUT arrays with multiple cells, where every cell in the array is coupled to other cells at their acoustic terminals through a mutual radiation impedance matrix. We get results comparable to finite element analysis accuracy. Hence, the analysis of a large array becomes a circuit theory problem and can be scrutinized with circuit simulators...
Finite element method (FEM) is used for transient dynamic analysis of capacitive micromachined ultrasonic transducers (CMUT) and is particularly useful when the membranes are driven in the nonlinear regime. One major disadvantage of FEM is the excessive time required for simulation. Harmonic balance (HB) analysis, on the other hand, provides an accurate estimate of the steady-state response of nonlinear...
The dual composite right/left-handed transmission line (D-CRLH TL) is designed using defected grounded structures (DGS) loaded with capacitor and stub with rectangular patches in this paper. Then the frequency characteristics of full-wave simulation results, obtained from FEM based on simulator, are compared with the equivalent circuit simulation results, which show that D-CRLH TL can be realized...
An accurate equivalent circuit model to represent a 2-dimentional (2-D) eddy-current magnetic field is presented. The magnetic field can be coupled with stranded windings and solid conductors. To develop the formulations of impedance computation, two systematic matrix analysis methods based on the system equations, one using loop method and one using nodal method, are presented. In the proposed work...
This paper describes a study on equivalent circuit model in a large synchronous machine. In this study, the authors studied the quadrature axis transient reactance xpsilaq, not only the influence of the operational impedance , but also the difference of transient and dynamic characteristics using finite element method (FEM) and EMTP.
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