A Thin and Broadband Microwave Absorber Based on Magnetic Sheets and Resistive FSS

Dong, Wei; Bie, Shaowei; Zhou, Jie; Xu, Haibing; Xu, Yongzhao; Jiang, Jianjun

doi:10.2528/pierc14122203

Cited by 15 publications

(4 citation statements)

References 12 publications

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“…But one should note that the thickness required by equation ( 22) is a sufficient condition but not a necessary condition to achieve a strong RL. There is a typical example: figure 2(b) is an exception that at 70 • incident angle, an RL of less than −10 dB could be observed in the thickness at 0.7 mm, which is far less than the thickness calculated by equation (26). This conclusion has also When the thickness was 1.5 mm, no efficient absorption occurred at 18 GHz at a large incident angle, and when the thickness was 2.2 mm, an area of efficient absorption appeared at a large incident angle.…”

Section: Investigation Of a Unique Efficient Absorption Phenomenonmentioning

confidence: 73%

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Investigating the absorption performance of a monolayer-coated absorber at oblique incidence

Zhang¹,

Liu²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

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There is a widely observed phenomenon in the microwave absorption field that an absorber always exhibits good oblique incidence absorption capacity if it has high performance at normal incidence. However, if a certain angle is exceeded, this kind of effective absorptive capacity will no longer be maintained. Besides, an absorber performs differently for incident transverse electric (TE) and transverse magnetic (TM) waves: for the TE case, the absorber can no longer obtain effective absorption; for the TM case, another efficient absorption region was observed at higher frequencies even when the incident angle exceeded 80°. These phenomena are widely found in the literature, which demonstrates that they are caused by physical laws rather than material properties. To demonstrate the underlying reason, in this study, the common spherical carbonyl iron-polyurethane composite absorbers were fabricated as a typical example. Their absorbing performance was investigated via both simulation and experiment. All the phenomena mentioned above were observed, studied in detail by employing the multiple reflection model, and explained quantitatively. Further, along with establishing the underlying mechanism of electromagnetic wave transmission in the absorber, two formulas were deduced to predict: (a) the maximum incident angle for efficient absorption of the TE polarized wave; and (b) the required absorber thickness for obtaining efficient absorption for a large incident angle of the TM polarized wave.

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Section: Investigation Of a Unique Efficient Absorption Phenomenonmentioning

confidence: 73%

“…To investigate its absorption performance, the HFSS simulation suite [26][27][28], which is based on the finite element method, was utilized. In the HFSS designed model, the absorbing system consisted of an air cavity, the absorber, and a metallic backing plate, as shown in figure 1(c).…”

Section: Em Parameter and Rl Simulationsmentioning

confidence: 99%

Investigating the absorption performance of a monolayer-coated absorber at oblique incidence

Zhang¹,

Liu²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

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“…In [17], the matrix transformation method for reducing return loss from dielectric surfaces by loading them with FSS is described. Broadband microwave absorption can be obtained by embedding a resistive FSS over a grounded dielectric substrate [18] or sandwiching it between two layers of magnetic sheets [19]. A resistor free partially transmissible absorptive FSS [20] is described at 2.46 GHz.…”

Section: Introductionmentioning

confidence: 99%

RCS reduction of microstrip antenna using split square loop thin absorber

Das

Mandal

2020

IET Microwaves, Antennas & Propagation

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“…ELM has been used in power system applications to solve the prediction and state evaluation problems [34][35]. The key principle of ELM for rotor position estimation of SRWG is given as follows.…”

Section: Extreme Learning Machinementioning

confidence: 99%

A Fault Diagnostic Method for Position Sensor of Switched Reluctance Wind Generator

Wang¹,

Liu²,

Liu³

et al. 2016

Journal of Electrical Engineering and Technology

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-Fast and accurate fault diagnosis of the position sensor is of great significance to ensure the reliability as well as sensor fault tolerant operation of the Switched Reluctance Wind Generator (SRWG). This paper presents a fault diagnostic scheme for a SRWG based on the residual between the estimated rotor position and the actual output of the position sensor. Extreme Learning Machine (ELM), which could build a nonlinear mapping among flux linkage, current and rotor position, is utilized to design an assembled estimator for the rotor position detection. The data for building the ELM based assembled position estimator is derived from the magnetization curves which are obtained from Finite Element Analysis (FEA) of an SRWG with the structure of 8 stator poles and 6 rotor poles. The effectiveness and accuracy of the proposed fault diagnosis method are verified by simulation at various operating conditions. The results provide a feasible theoretical and technical basis for the effective condition monitoring and predictive maintenance of SRWG.

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A Thin and Broadband Microwave Absorber Based on Magnetic Sheets and Resistive FSS

Cited by 15 publications

References 12 publications

Investigating the absorption performance of a monolayer-coated absorber at oblique incidence

Investigating the absorption performance of a monolayer-coated absorber at oblique incidence

RCS reduction of microstrip antenna using split square loop thin absorber

A Fault Diagnostic Method for Position Sensor of Switched Reluctance Wind Generator

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