Realistic equivalent circuit model of coplanar waveguide open circuit: lossy shunt resonator network

2002 ◽  
Vol 12 (5) ◽  
pp. 175-177 ◽  
Author(s):  
Lei Zhu
Keyword(s):  
Equivalent Circuit ◽  
Coplanar Waveguide ◽  
Equivalent Circuit Model ◽  
Open Circuit ◽  
Circuit Model

scholarly journals Broadband Equivalent Circuit Model for a Coplanar Waveguide Line Loaded with Split Ring Resonators

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Victor Sanz ◽  
Angel Belenguer ◽  
Alejandro L. Borja ◽  
Joaquin Cascon ◽  
Hector Esteban ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Coplanar Waveguide ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Limited Bandwidth ◽  
Left Handed ◽  
The Right

A new equivalent circuit for a coplanar waveguide loaded with split ring resonators is presented. The traditional circuits that model these devices are only able to characterize the left-handed propagation band, and their response is very similar to the real one within a very limited bandwidth. In contrast, this proposed broadband equivalent circuit is able to portray not only the left-handed propagation band, but also the right-handed one that occurs at higher frequencies. Besides, the response of this kind of basic cells can be adjusted with the proposed circuit model in a bandwidth close to a decade.

Self-Sensing Giant Magnetostrictive Actuator for Active Vibration Isolation

2017 ◽  
Vol 870 ◽  
pp. 67-72
Author(s):  
Yuan Yuan Yang ◽  
Lei Wang ◽  
Jiu Bin Tan ◽  
Xiao Yu Zhu ◽  
Bo Zhao ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Vibration Isolation ◽  
Equivalent Circuit Model ◽  
Open Circuit ◽  
Circuit Model ◽  
Output Force ◽  
Active Vibration ◽  
Magnetostrictive Actuator ◽  
External Forces ◽  
Active Vibration Isolation

Giant magnetostrictive actuator (GMA) are commonly used in active vibration isolation domain for hight frequency response and large output force. GMA has a nonlinear displacement output when disturbed by vibrations. In order to compensate for the nonlinearity and improve the precision of the system, the critical process is the measurement of external disturbances which can be realized with a bridge circuit based on a traditional equivalent circuit model. However, the sensitivity is restricted because of the integral relationship between the force and the open circuit voltage. In this paper, the conception of the dynamic inductance is proposed to optimize the equivalent circuit model that is based on coupled linear magneto-mechanical constitutive equations. Then the measurement for external forces becomes effective with the improvement in the sensitivity through measuring the dynamic inductance. A dynamic simulation is carried out to test the performance of GMA based on the equivalent circuit model. The external dynamic forces can be accurately detected by calculating the impedances in the self-sensing effect of the Terfenol-D.

scholarly journals Estimation for Battery State of Charge Based on Temperature Effect and Fractional Extended Kalman Filter

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5947
Author(s):  
Chengcheng Chang ◽  
Yanping Zheng ◽  
Yang Yu
Keyword(s):  
Kalman Filter ◽  
Equivalent Circuit ◽  
Extended Kalman Filter ◽  
Open Circuit Voltage ◽  
Equivalent Circuit Model ◽  
Open Circuit ◽  
Circuit Model ◽  
State Of Charge ◽  
First Order ◽  
Battery Capacity

The electric vehicle has become an important development direction of the automobile industry, and the lithium-ion power battery is the main energy source of electric vehicles. The accuracy of state of charge (SOC) estimation directly affects the performance of the vehicle. In this paper, the first order fractional equivalent circuit model of a lithium iron phosphate battery was established. Battery capacity tests with different charging and discharging rates and open circuit voltage tests were carried out under different ambient temperatures. The conversion coefficient of charging and discharging capacity and the simplified open circuit voltage model considering the hysteresis characteristics of the battery were proposed. The parameters of the first order fractional equivalent circuit model were identified by using a particle swarm optimization algorithm with dynamic inertia weight. Finally, the recursive formula of a fractional extended Kalman filter was derived, and the battery SOC was estimated under continuous Dynamic Stress Test (DST) conditions. The results show that the estimation method has high accuracy and strong robustness.

scholarly journals Permeability and Equivalent Circuit Model of Ionically Conductive Mortar Using Electrochemical Workstation

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1179
Author(s):  
An Xu ◽  
Yubin Weng ◽  
Ruohong Zhao
Keyword(s):  
Equivalent Circuit ◽  
Electrolyte Solution ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Construction Material ◽  
Equivalent Circuit Model ◽  
Open Circuit ◽  
Circuit Model ◽  
Directional Movement ◽  
Conductive Mechanism

Ionically conductive mortar is a new Portland cement-based construction material prepared by permeating electrolyte solution into porous mortar specimen. The conductive mechanism of ionically conductive mortar is the directional movement of internal free ions under external electric field. Because of the strong electrochemical properties of ionically conductive mortar, electrochemical workstation was used to test the performance of ionically conductive mortar. The open-circuit potential during the permeation process of ionically conductive mortar was tested. The results show that the change of open-circuit potential can effectively reflect the permeability rate of the samples with different porosity and electrolyte mass fraction. Besides the permeation of specimen, electrochemical workstation was also used to test the EIS (electrochemical impedance spectroscopy) of permeated specimens with different porosity, concentration of electrolyte solution, and different kinds of electrolyte solution. The quasi-Randles circuit model was then used to establish an equivalent circuit of ionically conductive mortar. Finally, the relation between parameter of circuit and the porosity or electrolyte solution was established. The test results show that solution resistance of the equivalent circuit and real resistivity of specimens is linearly correlated. This shows the equivalent circuit can effectively reflect the real resistivity of ionically conductive mortar, and the variation of electronic component parameters of equivalent circuit conforms to the conductive mechanism of ionically conductive mortar.

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