scholarly journals Phase Role in the Non-Uniformity of Main-Line Couplings in Asymmetric Extracted-Pole Inline Filters

Electronics ◽  
2021 ◽  
Vol 10 (24) ◽  
pp. 3058
Author(s):  
Ángel Triano ◽  
Patricia Silveira ◽  
Jordi Verdú ◽  
Eloi Guerrero ◽  
Pedro de Paco
Keyword(s):  
Phase Correction ◽  
Main Line ◽  
Hyperbolic Model ◽  
Characteristic Polynomials ◽  
Scattering Parameters ◽  
Transmission Zeros ◽  
And Topology ◽  
Ladder Network ◽  
Novel Method ◽  
Transmission And Reflection

The use of classical symmetrical polynomial definition to synthesize fully canonical inline filters with an asymmetrical distribution of the transmission zeros along the topology leads to the occurrence of uneven admittance inverter in the main-line. This form introduces some limitations to transform such topology into a ladder network. Despite circuital transformation can be used to accommodate both technology and topology, it is usual that extra reactive elements are necessary to implement phase shifts required to achieve the complete synthesis. This article introduces a novel method able to determine the required phase correction that has to be applied to the characteristic polynomials in order to equalize all the admittance inverters in the main path to the same value. It has been demonstrated that a suitable pair of phase values can be accurately estimated using a developed hyperbolic model which can be obtained from the transmission and reflection scattering parameters. To experimentally validate the proposed method, a Ladder-type filter with asymmetrical polynomial definition has been synthesized, fabricated, and measured, demonstrating the effectiveness of the developed solution.

scholarly journals High Selectivity Dual-Band Bandpass Filter with Tunable Lower Passband

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Wei-Qiang Pan ◽  
Xiao-Lan Zhao ◽  
Yao Zhang ◽  
Jin-Xu Xu
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Dual Band ◽  
Transmission Zeros ◽  
Resonant Modes ◽  
Novel Method ◽  
Good Agreement ◽  
Tunable Bandpass Filter

This paper presents a novel method to design dual-band bandpass filters with tunable lower passband and fixed upper passband. It utilizes a trimode resonator with three controllable resonant modes. Discriminating coupling is used to suppress the unwanted mode to avoid the interference. Varactors are utilized to realize tunable responses. The bandwidth of the two bands can be controlled individually. Transmission zeros are generated near the passband edges, resulting in high selectivity. For demonstration, a tunable bandpass filter is implemented. Good agreement between the prediction and measurement validates the proposed method.

Parameter Estimation of Linear Sensorimotor Synchronization Models: Phase Correction, Period Correction, and Ensemble Synchronization

2015 ◽  
Vol 3 (1-2) ◽  
pp. 52-87 ◽  
Author(s):  
Nori Jacoby ◽  
Naftali Tishby ◽  
Bruno H. Repp ◽  
Merav Ahissar ◽  
Peter E. Keller
Keyword(s):  
Experimental Data ◽  
Parameter Estimation ◽  
Linear Models ◽  
Estimation Error ◽  
Phase Correction ◽  
Sensorimotor Synchronization ◽  
Estimation Methods ◽  
Single Subject ◽  
Novel Method ◽  
Parameter Estimation Methods

Linear models have been used in several contexts to study the mechanisms that underpin sensorimotor synchronization. Given that their parameters are often linked to psychological processes such as phase correction and period correction, the fit of the parameters to experimental data is an important practical question. We present a unified method for parameter estimation of linear sensorimotor synchronization models that extends available techniques and enhances their usability. This method enables reliable and efficient analysis of experimental data for single subject and multi-person synchronization. In a previous paper (Jacoby et al., 2015), we showed how to significantly reduce the estimation error and eliminate the bias of parameter estimation methods by adding a simple and empirically justified constraint on the parameter space. By applying this constraint in conjunction with the tools of matrix algebra, we here develop a novel method for estimating the parameters of most linear models described in the literature. Through extensive simulations, we demonstrate that our method reliably and efficiently recovers the parameters of two influential linear models: Vorberg and Wing (1996), and Schulze et al. (2005), together with their multi-person generalization to ensemble synchronization. We discuss how our method can be applied to include the study of individual differences in sensorimotor synchronization ability, for example, in clinical populations and ensemble musicians.

Generating Process Network Communication Infrastructure for Custom Multi-Core Platforms

2010 ◽  
Vol 1 (1) ◽  
pp. 37-63
Author(s):  
Peter Sørensen ◽  
Jan Madsen
Keyword(s):  
Network Communication ◽  
Analysis Method ◽  
Communication Infrastructure ◽  
Process Networks ◽  
And Topology ◽  
Novel Method

We present an approach for generating implementations of abstraction layers implementing the communication infrastructure of applications modeled as process networks. Our approach is unique in that it does not rely on assumptions about the capabilities and topology of the underlying platform. Instead, a generic implementation is adapted to the particular platform based on information retrieved from analyzing the platform. At the heart of the approach is a novel method for analyzing the capabilities of custom execution platforms composed of components. The versatility and usefulness of the approach and analysis method is demonstrated through a case study.

Generating Process Network Communication Infrastructure for Custom Multi-Core Platforms

2012 ◽  
pp. 241-261
Author(s):  
Peter Sørensen ◽  
Jan Madsen
Keyword(s):  
Network Communication ◽  
Analysis Method ◽  
Communication Infrastructure ◽  
Process Networks ◽  
And Topology ◽  
Novel Method

We present an approach for generating implementations of abstraction layers implementing the communication infrastructure of applications modeled as process networks. Our approach is unique in that it does not rely on assumptions about the capabilities and topology of the underlying platform. Instead, a generic implementation is adapted to the particular platform based on information retrieved from analyzing the platform. At the heart of the approach is a novel method for analyzing the capabilities of custom execution platforms composed of components. The versatility and usefulness of the approach and analysis method is demonstrated through a case study.

scholarly journals Homogenization Models for a Simple Dielectric-Composite Slab upon Oblique Incidence

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Jiaran Qi ◽  
Jinghui Qiu ◽  
Chongzhi Han
Keyword(s):  
Oblique Incidence ◽  
Model Parameters ◽  
Scattering Parameters ◽  
Composite Slab ◽  
Reflection Data ◽  
Dielectric Composite ◽  
Propagation Matrix ◽  
Independent Parameters ◽  
Transmission And Reflection ◽  
Stratified Model

Four different models are applied to effectively describe a geometrically simple dielectric-composite slab. The corresponding model parameters, when the oblique incidence is taken into account, are retrieved based on the transmission and reflection data and compensated with the nonmagnetic assumption. The scattering parameters of each model with derived parameters for various angles of incidence are then analytically calculated using the forward propagation matrix method and compared with the simulated scattering parameters from the real composite slab. According to these comparisons, it is shown that spatial dispersion makes it challenging to achieve angle-independent parameters for the applied four models. Moreover, when a stratified model is employed to describe the composite slab of our interest under oblique incidence, the boundary layers need to be anisotropic.

scholarly journals Determining the Effective Electromagnetic Parameters of Photonic Crystal by Phase Unwrapping and Denoising Method

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Guizhen Lu ◽  
Zhonghang Duan ◽  
Hongcheng Yin ◽  
Zhihe Xiao ◽  
Jing Zhang
Keyword(s):  
Photonic Crystal ◽  
Phase Unwrapping ◽  
Reflection Method ◽  
Scattering Parameters ◽  
Effective Parameters ◽  
Electromagnetic Parameters ◽  
Transform Method ◽  
Denoising Method ◽  
Parameters Extraction ◽  
Transmission And Reflection

The electromagnetic parameters of the dispersion material and metamaterial are vital in the engineering. The phase unwrapping method is proposed to deal with the phase ambiguity of the transmission and reflection method in electromagnetic (EM) parameters extraction. The computed results demonstrate that the proposed method can give the correct effective parameters. In dealing with scattering parameters with noise, the wavelet transform method is utilized to remove the noise added to the scattering parameters. The simulated results show that the correct material parameters can be obtained by wavelet denoising method. Finally, the proposed method is used to extract the parameters of the photonic crystal. The effective parameter gives a different aspect in explanation to the function for the photonic crystal.

scholarly journals A Compact Triple-Band Negative Permittivity Metamaterial for C, X-Band Applications

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Dushyant Marathe ◽  
Kishore Kulat
Keyword(s):  
Ring Resonator ◽  
Effective Medium ◽  
Negative Permittivity ◽  
Design Parameters ◽  
Scattering Parameters ◽  
Resonant Frequencies ◽  
Full Wave ◽  
X Band ◽  
Transmission And Reflection ◽  
Triple Band

We report a new design of triple-band electric metamaterial resonator (TBEMR) based on integration of open delta loops within square ring resonator. This metamaterial resonator has three distinct ε-negative regions (ENG) over C, X frequency bands. The transmission and reflection response of the proposed subwavelength resonator is analyzed using full-wave electromagnetic solver Ansys HFSS to demonstrate the presence of electrical resonances within frequencies 4–12 GHz. Effective medium parameters permittivity and permeability are extracted from simulated complex scattering parameters to verify existence of ENG regions. The investigations are also carried out regarding dependence of resonant frequencies on design parameters of the TBEMR unit cell. The effective medium ratio (λ0/a) for proposed subwavelength resonator is compared with various other metamaterial resonators to indicate its compact nature.

scholarly journals Quantitative Analysis of Insulator Degradation in a Single Layer Solenoid by Renormalization of the Transmission Parameter

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1984
Author(s):  
Kwangho Kim ◽  
JunHee Han ◽  
Jangbom Chai ◽  
Wansoo Nah
Keyword(s):  
Transmission Line ◽  
Single Layer ◽  
Transmission Line Model ◽  
Scattering Parameters ◽  
Phase Information ◽  
Transmission Parameter ◽  
Novel Method ◽  
Phase Data ◽  
Renormalization Technique ◽  
Permittivity Change

In this paper, a novel method to quantitatively analyze insulator degradation in a single layer solenoid is proposed. The suggested method employs renormalization of scattering parameters to efficiently detect changes of permittivity in a degraded solenoid. Firstly, a transmission line model, including a locally degraded part in the insulator, was developed, and it was determined that the phase information of the transmission parameter was very informative to check the permittivity change in the transmission line. To check the workability of this idea in a solenoid, a 30-turn single-layer solenoid was designed and fabricated, and 51 degraded states for mimicking insulation deterioration in each turn were introduced by installing additional insulator rings, which increased local relative permittivity. The phase data of the measured transmission parameter turned out to be useful for quantifying changes of the insulator in the solenoid. To maximize the detectability, the measured scattering parameters were renormalized with different reference impedances, which was very useful for detecting degradation in the transmission parameter. In this paper, detailed procedures for quantitatively analyzing degradation of an insulator are proposed and we verify that the suggested renormalization technique is very promising for effectively evaluating the degradation of a solenoid.

scholarly journals A Novel Investigation Method for the S21 Detection Circuit

2020 ◽  
Vol 10 (4) ◽  
pp. 252-262
Author(s):  
Ming-Che Lee
Keyword(s):  
Process Variations ◽  
Measurement Precision ◽  
The Novel ◽  
Scattering Parameters ◽  
Low Frequencies ◽  
Investigation Method ◽  
Detection Circuit ◽  
Novel Method ◽  
Practical Recommendations ◽  
Measured Phase

This research proposes a novel method to investigate the performance of the S21 detection circuit. Aiming at low frequencies or DC, the method serves as an efficient way of verification and enjoys the benefit of low testing costs. The novel investigation method is demonstrated at 50 MHz and verified by the scattering parameters at 11.05 GHz. Based on the investigation, a model of process variations is constructed. The length of the interface paths is estimated by the model to be 63µm, which is consistent with the corresponding length of 74.6µm in the layout. For the measured phase and magnitude, the model indicates that the process variations in the device under test cause errors of 18.91% and 1.27%, whereas those in the interface paths lead to errors of 1.83% and 1%. Based on the model, practical recommendations are also proposed to further improve the measurement precision in the future.

An Adaptive Time Domain Approach to Characterize Dispersive Elastodynamic Media

2017 ◽  
Author(s):  
Reza Abedi
Keyword(s):  
Time Domain ◽  
Scattering Problem ◽  
Equivalent Material ◽  
Scattering Parameters ◽  
Retrieval Method ◽  
Linear Solution ◽  
Transmission And Reflection Coefficients ◽  
Adaptive Time ◽  
Constitutive Parameters ◽  
Transmission And Reflection

A time domain approach is presented to compute the transmission and reflection coefficients of a unit cell. The solution of a wave scattering problem to an ultra-short incident wave enables the derivation of these scattering parameters with only one time domain solution. The adaptive operations of a spacetime discontinuous Galerkin method and several or its unique properties, such as linear solution complexity and local / asynchronous solution features, enable accurate computation of scattering parameters. An inverse parameter retrieval method, from the equivalent material impedance and wave speed to dispersive elastic constitutive parameters, is uniquely solved by using the continuity of the wavenumber.

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