In this paper,we propose an RLC equivalent circuit model theory which can accurately predict the spectral response and resonance characteristics of metamaterial absorption structures,extend its design,and characterize...In this paper,we propose an RLC equivalent circuit model theory which can accurately predict the spectral response and resonance characteristics of metamaterial absorption structures,extend its design,and characterize the parameters of the model in detail.By employing this model,we conducted computations to characterize the response wavelength and bandwidth of variously sized metamaterial absorbers.A comparative analysis with Finite Difference Time Domain(FDTD)simulations demonstrated a remarkable level of consistency in the results.The designed absorbers were fabricated using micro-nano fabrication processes,and were experimentally tested to demonstrate absorption rates exceeding 90%at a wavelength of 9.28μm.The predicted results are then compared with test results.The comparison reveals good consistency in two aspects of the resonance responses,thereby confirming the rationality and accuracy of this model.展开更多
This paper presents a systematic study on the modeling and stability analysis of fractional-order cascaded RLC networks with time delays.A generalized model of an n-stage cascaded RLC network with time delays is devel...This paper presents a systematic study on the modeling and stability analysis of fractional-order cascaded RLC networks with time delays.A generalized model of an n-stage cascaded RLC network with time delays is developed using the Caputo fractional derivative.The corresponding fractional-order differential equations are derived for both single-stage(n=1)and two-stage(n=2)configurations.The transcendental characteristic equation of the system is obtained via Laplace transform.By applying the Matignon stability criterion,asymptotic stability conditions are established for systems with and without time delays.It is shown that stability in the delay-free case depends mainly on the fractional orderα,whereas in the presence of time delays,stability is independent ofαand instead governed by the delay parameter τ.Notably,the critical delay threshold τ_(max) for system stability is derived analytically.A detailed numerical study(Table Ⅰ)further elucidates the effects of key parameters,including the resistance R,inductance L,capacitance C,fractional orderα,and time delayτon the stability behavior.This study provides a theoretical basis and practical design guidelines for tuning parameters to ensure stability in fractional-order circuits with time delays.展开更多
针对3GPP最新发布的LTE(long term evolution)Release 8标准,研究了LTE空中接口协议栈无线链路控制(radio link control,RLC)的子层确认(acknowledged mode,AM)传输模式的设计与实现机制。主要介绍了LTE无线接入网空中接口协议栈的结构...针对3GPP最新发布的LTE(long term evolution)Release 8标准,研究了LTE空中接口协议栈无线链路控制(radio link control,RLC)的子层确认(acknowledged mode,AM)传输模式的设计与实现机制。主要介绍了LTE无线接入网空中接口协议栈的结构,详细阐述了空中接口协议栈中RLC的AM数据传输模式的运行原理,最后根据协议设计了一种具体在协议栈软件中实现AM传输模式的方法。展开更多
基金Supported by the National Natural Science Foundation of China(62174092)the Open Fund of State Key Laboratory of Infrared Physics(SITP-NLIST-ZD-2023-04)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0580000)。
文摘In this paper,we propose an RLC equivalent circuit model theory which can accurately predict the spectral response and resonance characteristics of metamaterial absorption structures,extend its design,and characterize the parameters of the model in detail.By employing this model,we conducted computations to characterize the response wavelength and bandwidth of variously sized metamaterial absorbers.A comparative analysis with Finite Difference Time Domain(FDTD)simulations demonstrated a remarkable level of consistency in the results.The designed absorbers were fabricated using micro-nano fabrication processes,and were experimentally tested to demonstrate absorption rates exceeding 90%at a wavelength of 9.28μm.The predicted results are then compared with test results.The comparison reveals good consistency in two aspects of the resonance responses,thereby confirming the rationality and accuracy of this model.
基金supported by the National Natural Science Foundation of China(No.12371180)。
文摘This paper presents a systematic study on the modeling and stability analysis of fractional-order cascaded RLC networks with time delays.A generalized model of an n-stage cascaded RLC network with time delays is developed using the Caputo fractional derivative.The corresponding fractional-order differential equations are derived for both single-stage(n=1)and two-stage(n=2)configurations.The transcendental characteristic equation of the system is obtained via Laplace transform.By applying the Matignon stability criterion,asymptotic stability conditions are established for systems with and without time delays.It is shown that stability in the delay-free case depends mainly on the fractional orderα,whereas in the presence of time delays,stability is independent ofαand instead governed by the delay parameter τ.Notably,the critical delay threshold τ_(max) for system stability is derived analytically.A detailed numerical study(Table Ⅰ)further elucidates the effects of key parameters,including the resistance R,inductance L,capacitance C,fractional orderα,and time delayτon the stability behavior.This study provides a theoretical basis and practical design guidelines for tuning parameters to ensure stability in fractional-order circuits with time delays.
文摘针对3GPP最新发布的LTE(long term evolution)Release 8标准,研究了LTE空中接口协议栈无线链路控制(radio link control,RLC)的子层确认(acknowledged mode,AM)传输模式的设计与实现机制。主要介绍了LTE无线接入网空中接口协议栈的结构,详细阐述了空中接口协议栈中RLC的AM数据传输模式的运行原理,最后根据协议设计了一种具体在协议栈软件中实现AM传输模式的方法。
