scholarly journals A Study on the Electromagnetic–Thermal Coupling Effect of Cross-Slot Frequency Selective Surface

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 640
Author(s):  
Yi Lu ◽  
Juan Chen ◽  
Jianxing Li ◽  
Wenjing Xu
Keyword(s):  
Thermal Effect ◽  
Coupling Effect ◽  
Incident Angle ◽  
Frequency Selective Surface ◽  
Simulation Software ◽  
Maximum Temperature ◽  
Thermal Coupling ◽  
Stable Temperature ◽  
Frequency Selective ◽  
The Cross

In high-power microwave applications, the electromagnetic-thermal effect of frequency selective surface (FSS) cannot be ignored. In this paper, the electromagnetic-thermal coupling effects of cross-slot FSS were studied. We used an equivalent circuit method and CST software to analyze the electromagnetic characteristics of cross-slot FSS. Then, we used multi-field simulation software COMSOL Multiphysics to study the thermal effect of the FSSs. To verify the simulation results, we used a horn antenna with a power of 20 W to radiate the FSSs and obtain the stable temperature distribution of the FSSs. By using simulations and experiments, it is found that the maximum temperature of the cross-slot FSS appears in the middle of the cross slot. It is also found that the FSS with a narrow slot has severer thermal effect than that with a wide slot. In addition, the effects of different incident angles on the temperature variation of FSS under TE and TM polarization were also studied. It is found that in TE polarization, with the increase in incident angle, the maximum stable temperature of FSS increases gradually. In TM polarization, with the increase in incident angle, the maximum stable temperature of FSS decreases gradually.

scholarly journals A Broadband Linear-to-Circular Transmission Polarizer Based on Right-Angled Frequency Selective Surfaces

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Wei Zhang ◽  
Jian-ying Li ◽  
Jian Xie
Keyword(s):  
Insertion Loss ◽  
Incident Angle ◽  
Frequency Selective Surface ◽  
Experimental Results ◽  
Frequency Selective Surfaces ◽  
Transmission Coefficients ◽  
High Transmission ◽  
X Band ◽  
Low Insertion Loss ◽  
Frequency Selective

A broadband linear-to-circular transmission polarizer using a right-angled frequency selective surface is presented in this paper. The new proposed polarizer has both advantages of wide operational bandwidth and high transmission coefficients. To verify the design, a new polarizer working in X-band is optimized and fabricated. Experimental results show that the measured axial ratios lower than 3 dB range from 6.42 to 13.70 GHz, with low insertion loss. Meanwhile, the polarizer can operate over a broad range of frequencies from 6.75 to 10.75 GHz, when the incident angle increases to 25°.

scholarly journals Passive sensor frequency selective surface for structural health monitoring

2019 ◽  
Vol 14 (2) ◽  
pp. 744
Author(s):  
F.H.W. Mustafa ◽  
S.N. Azemi ◽  
M.F. Jamlos ◽  
A.A. Al-Hadi ◽  
P.J. Soh
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Incident Angle ◽  
New Technology ◽  
Mechanical Strain ◽  
Frequency Selective Surface ◽  
Circular Ring ◽  
Civil Structures ◽  
Structural Health ◽  
Frequency Selective

Structural health monitoring (SHM) technologies have attained attention to monitor civil structures. SHM sensor systems have been used in various civil structures such as bridges, buildings, tunnels and so on. However the previous sensor for SHM is wired and encounter with problem to cover large areas. Therefore, wireless sensor was introduced for SHM to reduce network connecting problem. Wireless sensors for Structural Health monitoring are new technology and have many advantages to overcome the drawback of conventional and wired sensor. This project proposed passive wireless SHM sensor using frequency selective surface (FSS) as an alternative to conventional sensors. The electromagnetic wave characteristic of FSS will change by geometrical changes of FSS due to mechanical strain or structural failure. The changes feature is used as a sensing function without any connecting wires. Two type of design which are circular ring and square loop along with the transmission and reflection characteristics of SHM using FSS were discussed in this project. A simulation process has shown that incident angle characteristics can be use as a data for SHM application.

scholarly journals Wideband absorber based on conductive ink frequency selective surface with polarization insensitivity and wide-incident-angle stability

2020 ◽  
Vol 10 ◽  
pp. 184798042093571
Author(s):  
Guangsheng Deng ◽  
Kun Lv ◽  
Hanxiao Sun ◽  
Yuan Hong ◽  
Xiaoying Zhang ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Incident Angle ◽  
Frequency Selective Surface ◽  
Transverse Magnetic ◽  
Center Frequency ◽  
Conductive Ink ◽  
Angle Stable ◽  
Potential Applications ◽  
Frequency Selective ◽  
Incident Waves

In this article, a wideband, polarization-insensitive, and wide-incident-angle stable absorber based on conductive ink frequency selective surface is presented. The presented absorber is compatible with screen printing technology. The design and absorption principle of the proposed absorber is presented, and simulation analysis is conducted. The simulation results show that in the frequency range 6.58–16.38 GHz, the absorptivity of the proposed absorber is greater than 90%, while the relative absorption bandwidth is 85.4%. The whole absorber structure is relatively thin, having a total thickness of 3.3 mm, corresponding to 0.126λ0 at its center frequency. In addition, for both transverse electric and transverse magnetic incident waves, the proposed absorber achieves the absorptivity of more than 80% at the incident angle of up to 45°. A prototype of the proposed absorber is fabricated and used in experimental verification. The obtained experimental results show a good agreement with the numerical simulations. This absorber has great potential applications in the field of microwave sensing and absorbing.

Radiation characteristics of microstrip antenna on frequency selective surface absorbing layer

2020 ◽  
pp. 1-7
Author(s):  
Ashish Raj ◽  
Nisha Gupta
Keyword(s):  
Microstrip Antenna ◽  
Printed Circuit Board ◽  
Ground Plane ◽  
Frequency Selective Surface ◽  
Simulation Software ◽  
Circuit Board ◽  
Radiation Characteristics ◽  
Frequency Selective ◽  
Absorbing Layer ◽  
Potential Use

Abstract The radiation characteristics of the microstrip antenna (MSA) on the frequency selective surface (FSS) based absorbing layer is presented in this paper. It is observed that an absorbing layer placed between the MSA configuration and the ground plane helps in controlling the radiation characteristics of the antenna. It not only reduces the back lobe but also reduces the beamwidth and gain of the antenna simultaneously. This is because the absorbing layer absorbs some amount of power radiated by the antenna in both forward and backward directions. The proposed design is simulated using Ansys HFSS electromagnetic simulation software and the results are validated by comparing it with the results obtained from the equivalent circuit approach as well as experimental results. The effect of absorber on radiation characteristics of the radiator demonstrates its potential use in suppressing the radiation from the printed circuit board traces.

scholarly journals Design of frequency selective surface comprising of dipoles using artificial neural network

2020 ◽  
Vol 9 (4) ◽  
pp. 276
Author(s):  
Monojit Rudra ◽  
P Soni Reddy ◽  
Rajatsubhra Chakraborty ◽  
Partha Pratim Sarkar
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Simulated Data ◽  
Frequency Selective Surface ◽  
Simulation Software ◽  
Computational Time ◽  
Ann Models ◽  
Artificial Neural ◽  
Frequency Selective ◽  
Artificial Neural Network Ann

<span>This paper depicts the design of Frequency Selective Surface (FSS) comprising of dipoles using Artificial Neural Network (ANN). It has been observed that with the change of the dimensions and periodicity of FSS, the resonating frequency of the FSS changes. This change in resonating frequency has been studied and investigated using simulation software. The simulated data were used to train the proposed ANN models. The trained ANN models are found to predict the FSS characteristics precisely with negligible error. Compared to traditional EM simulation softwares (like ANSOFT Designer), the proposed technique using ANN models is found to significantly reduce the FSS design complexity and computational time. The FSS simulations were made using ANSOFT Designer v2 software and the neural network was designed using MATLAB software.</span>

scholarly journals Elliptical BandPassThree Dimensional Frequency Selective Surface with Multiple Transmission Zeros

2018 ◽  
Vol 12 (3) ◽  
pp. 1020
Author(s):  
Bimal Raj Dutta ◽  
Binod Kumar Kanaujia ◽  
Chhaya Dalela
Keyword(s):  
Plane Wave ◽  
Incident Angle ◽  
Frequency Selective Surface ◽  
Unit Cell ◽  
Long Distance ◽  
Band Frequency ◽  
Microstrip Lines ◽  
Transmission Zeros ◽  
Band Pass ◽  
Frequency Selective

An elliptic band pass response three-dimensional Frequency Selective Surface (3D FSS) is designed from a single unit cell of 2D array of two shielded microstrip lines. The designed FSS provides pseudo-elliptic band-pass frequency response (5.4 – 9.6) GHz with its application in long-distance radio telecommunications and space communications etc. The four transmission zeros at 5.4GHz, 9.6GHz, 12.4GHz and 15GHz provides wide out-of-band frequency rejection. The 3D FSS is independent of the variations in the incident angle of the plane wave up to 60 degree. Each unit cell is a combination of two shielded microstrip lines with one having an air gap and the other one having in between rectangular metallic plate. When a TE polarized plane wave incidents perpendicular to the perfect electric conductor (PEC) boundary walls shielded microstrip lines, it results in two quasi-TEM modes namely air and substrate mode. The 3D FSS consists of multiple resonators with a multimode cavity having number of propagating modes. These resonating modes in phase provide transmission poles and when out of phase give transmission zeros. The 3D FSS structure is simulated using Ansys HFSS software with improved performance over 2DFSS, for many practical applications such as antenna sub-reflector, radomes and spatial filters.

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