An Infrared Frequency Selective Surface with Dual Stopband

2018 ◽  
Vol 937 ◽  
pp. 97-104
Author(s):  
Ke Xin Wang ◽  
Bin Ke Wang
Keyword(s):  
Layer Thickness ◽  
Dielectric Layer ◽  
Effective Medium Theory ◽  
Transmission Rate ◽  
Incident Angle ◽  
Frequency Selective Surface ◽  
Polarization Mode ◽  
Hexagonal Ring ◽  
Atmospheric Window ◽  
Frequency Selective

In order to get the low transmission rate in both mid infrared atmospheric window and far infrared atmospheric window, an infrared frequency selective surface composed of two layers based on hexagonal ring structure was designed. Simulation analysis using CST electromagnetic software shown that the frequency selective surface had two stopbands in both 3μm~5μm and 8μm~15μm regions, of which the average transmittance is lower than 2.5%. Therefore, this frequency selective surface realized two stopbands in infrared wavebands; This paper analyzed the filtering mechanism of the frequency selective surface based on the effective medium theory. In the end, this paper researched the effect of electromagnetic wave polarization mode, incident angle and dielectric layer thickness on the transmission properties of the frequency selective surface. The results revealed that the transmission of frequency selective surface is insensitive to polarization mode and incident angle, while the dielectric layer thickness is an important factor to the transmittance of frequency selective surface.

Parametric studies on hexagonal ring based aperture and patch type curved frequency selective surface

2018 ◽  
Vol 60 (4) ◽  
pp. 1006-1010 ◽  
Author(s):  
N. Begam ◽  
S. Sarkar ◽  
P. Samaddar ◽  
S. Saha ◽  
D. Chanda Sarkar ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Patch Type ◽  
Hexagonal Ring ◽  
Parametric Studies ◽  
Frequency Selective

scholarly journals A transmit/reflect switchable frequency selective surface based on all dielectric metamaterials

2015 ◽  
Vol 05 (04) ◽  
pp. 1550035 ◽  
Author(s):  
Fei Yu ◽  
Jun Wang ◽  
Jiafu Wang ◽  
Hua Ma ◽  
Hongliang Du ◽  
...  
Keyword(s):  
Effective Medium Theory ◽  
Frequency Selective Surface ◽  
Wave Band ◽  
Medium Theory ◽  
Left Handed ◽  
Resonance Frequencies ◽  
Induced Field ◽  
Millimeter Wave Band ◽  
Frequency Selective ◽  
Magnetic Resonances

In this paper, we propose a novel transmit/reflect switchable frequency selective surface (FSS) in millimeter wave band based on the effective medium theory under quasi-static limit, which is designed with square-hole elements cut from continuum dielectric plates. The building elements of the surface are composed of all dielectric metamaterial rather than metal material. With proper structural design and parameters tuning, the resonance frequencies can be tuned appropriately. The frequency response of the surface can be switched from that of a reflecting structure to a transmitting one by rotating the surface [Formula: see text], which means under different incident polarizations. The reflective response can be realized due to the effect of electric and magnetic resonances. Theoretical analysis shows that the reflective response arises from impedance mismatching by electric and magnetic resonances. And the transmitting response is the left-handed passband, arises from the coupling of the electric and magnetic resonances. In addition, effective electromagnetic parameters and the dynamic induced field distributions are analyzed to explain the mechanism of the responses. The method can also be used to design switchable all-dielectric FSS with continuum structures in other frequencies.

scholarly journals Infrared Frequency Selective Surface with Dual Stopband Based on Hexagonal Ring Structure

2020 ◽  
Vol 42 (6) ◽  
pp. 528-533
Author(s):  
昌会 田 ◽  
真 孟 ◽  
晓霞 田 ◽  
琦 范 ◽  
百愚 杨 ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Ring Structure ◽  
Hexagonal Ring ◽  
Frequency Selective

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 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 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.

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