scholarly journals Design of Miniaturized Multiband Filters Using Zero Order Resonators for WLAN Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Maryam Shafiee ◽  
Mohammad Amin Chaychi Zadeh ◽  
Homayoon Oraizi
Keyword(s):  
Least Squares ◽  
Equivalent Circuit ◽  
Narrow Band ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Zero Order ◽  
Dual Band ◽  
Method Of Least Squares ◽  
Band Filter ◽  
Narrow Band Filter

The objective of this paper is to design miniaturized narrow- and dual-band filters for WLAN application using zero order resonators by the method of least squares. The miniaturization of the narrow-band filter is up to 70% and that of the dual-band filter is up to 64% compared to the available models in the literature. Two prototype models of the narrow-band and dual-band filters are fabricated and measured, which verify the proposed structure for the filter and its design by the presented method, using an equivalent circuit model.

scholarly journals A Simplified Fractional Order Equivalent Circuit Model and Adaptive Online Parameter Identification Method for Lithium-Ion Batteries

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Jianlin Wang ◽  
Le Zhang ◽  
Dan Xu ◽  
Peng Zhang ◽  
Gairu Zhang
Keyword(s):  
Parameter Identification ◽  
Least Squares ◽  
Equivalent Circuit ◽  
Fractional Order ◽  
Equivalent Circuit Model ◽  
Lithium Ion ◽  
Circuit Model ◽  
Stability And Convergence ◽  
Battery Management System ◽  
Identification Method

In order to improve the battery management system performance and enhance the adaptability of the system, a fractional order equivalent circuit model of lithium-ion battery based on electrochemical test was established. The parameters of the fractional order equivalent circuit model are identified by the least squares parameter identification method. The least squares parameter identification method needs to rely on the harsh test conditions of the laboratory, and the parameter identification result is static; it cannot adapt to the characteristics of the lithium battery under dynamic conditions. Taking into account the dynamic changes of lithium batteries, a parameter adaptive online estimation algorithm for fractional equivalent circuit model is proposed. Based on the theory of fractional order calculus and indirect Lyapunov method, the stability and convergence of the estimator are analyzed. Finally, simulation experiments show that this method can continuously estimate the parameters of the fractional order equivalent circuit under UDDS conditions.

A NOVEL COMPOSITE RIGHT/LEFT-HANDED TRANSMISSION LINE FOR DUAL-BAND APPLICATIONS

2013 ◽  
Vol 22 (04) ◽  
pp. 1350038
Author(s):  
LIYU HUANG ◽  
HONGXIN ZHANG ◽  
YUANYUAN XU ◽  
PENGFEI HE
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
Model Simulation ◽  
Strong Support ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Dual Band ◽  
Model Parameters ◽  
Dispersion Diagram ◽  
Left Handed

A composite right/left-handed transmission line (CRLH-TL) composed of a substrate and X-shaped metal patches is proposed and investigated theoretically as well as experimentally. The scattering parameters are investigated both in electromagnetic (EM) simulation and equivalent circuit model simulation, it is found that the structure works as a dual band CRLH-TL having the first right-handed passband and the second balanced CRLH frequency band at the resonant frequencies of 6.27 GHz and 13.45 GHz, respectively. Moreover, the required equations and the dispersion diagram derived from the equivalent circuit model to analyze the proposed CRLH structure give strong support to the interpretation of all EM phenomena. The effect of the equivalent circuit model parameters on the dispersion diagram is investigated. A parallel-plate waveguide (PPW) measurement system is employed to validate the characteristics of the CRLH-TL whose features show that the design of the novel artificial TLs is more flexible and convenient.

An Equivalent Circuit Model for Vertical Comb Drive MEMS Optical Scanner Controlled by Pulse Width Modulation

2012 ◽  
Vol 132 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Satoshi Maruyama ◽  
Muneki Nakada ◽  
Makoto Mita ◽  
Takuya Takahashi ◽  
Hiroyuki Fujita ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Comb Drive ◽  
Optical Scanner

scholarly journals A Novel, Improved Equivalent Circuit Model for Double-Sided Linear Induction Motor

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1644
Author(s):  
Qian Zhang ◽  
Huijuan Liu ◽  
Tengfei Song ◽  
Zhenyang Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Equivalent Circuit ◽  
Skin Effect ◽  
Equivalent Circuit Model ◽  
Element Model ◽  
Circuit Model ◽  
End Effects ◽  
3D Finite Element ◽  
Linear Induction

A novel, improved equivalent circuit model of double-sided linear induction motors (DLIMs) is proposed, which takes the skin effect and the nonzero leakage reactance of the secondary, longitudinal, and transverse end effects into consideration. Firstly, the traditional equivalent circuit with longitudinal and transverse end effects are briefly reviewed. Additionally, the correction coefficients for longitudinal and transverse end effects derived by one-dimensional analysis models are given. Secondly, correction factors for skin effect, which reflects the inhomogeneous air gap magnetic field vertically, and the secondary leakage reactance are derived by the quasi-two-dimensional analysis model. Then, the proposed equivalent circuit is presented, and the excitation reactance and secondary resistance are modified by the correction coefficients derived from the three analytical models. Finally, a three-dimensional (3D) finite element model is used to verify the proposed equivalent circuit model under varying air gap width and frequency, and the results are also compared with that of the traditional equivalent circuit models. The calculated thrust characteristics by the proposed equivalent circuit and 3D finite element model are experimentally validated under a constant voltage–frequency drive.

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