Performance of millimetre-wave frequency selective surfaces in large incident angle quasioptical systems

1992 ◽  
Vol 28 (8) ◽  
pp. 788 ◽  
Author(s):  
R. Cahill ◽  
E.A. Parker
Keyword(s):  
Incident Angle ◽  
Wave Frequency ◽  
Frequency Selective Surfaces ◽  
Millimetre Wave ◽  
Frequency Selective

scholarly journals Nanosecond Laser Etching of Aluminum-Plated Composite Materials Applied to Frequency Selective Surfaces

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2808
Author(s):  
Jian Cheng ◽  
Shufeng Jing ◽  
Deyuan Lou ◽  
Qibiao Yang ◽  
Qing Tao ◽  
...  
Keyword(s):  
Composite Materials ◽  
Laser Pulse ◽  
Focal Spot ◽  
Incident Angle ◽  
Spot Size ◽  
Nanosecond Laser ◽  
Frequency Selective Surfaces ◽  
Laser Etching ◽  
Focal Spot Size ◽  
Frequency Selective

High-quality frequency selective surfaces (FSSs) are important for electromagnetic signal absorption/filtration. Usually, they are made from wave-transparent composite materials covered with a thin metal layer. Current machining methods show some disadvantages when performing fabrication on the structure. Based on its flexibility and uncontactable processing characteristics, nanosecond laser etching of aluminum-plated composite materials applied to FSSs was investigated. To observe the influence of the laser light incident angle, etching of a series of square areas with different incident angles was performed. Thereafter, an image processing method, named the image gray variance (IGV), was employed to perform etching quality evaluation analysis. The observed microscopic pictures of experimental samples were consistent with those of the IGV evaluation. The potential reasons that might affect the etching quality were analyzed. Following all the efforts above, an incident angle range of ±15° was recommended, and the best etching result was obtained at the incident angle of 10°. To observe the influence of the laser pulse overlap and focal spot size on the etched area border uniformity and on the potential damage to the base materials, a theoretical equation was given, and then its prediction of area border edge burrs fluctuation was compared with the experiments. Furthermore, SEM pictures of etched samples were examined. Based on the study, a processing window of the laser pulse overlap and focal spot size was recommended. To conclude, optimal etching results of the FSS materials could be guaranteed by using the right laser operating parameters with the nanosecond laser.

Miniaturised millimetre wave frequency selective surface for atmospheric remote sensing

2017 ◽  
Vol 53 (10) ◽  
pp. 663-665
Author(s):  
J. Poojali ◽  
S. Ray ◽  
B. Pesala ◽  
C.V. Krishnamurthy ◽  
K. Arunachalam
Keyword(s):  
Remote Sensing ◽  
Frequency Selective Surface ◽  
Wave Frequency ◽  
Millimetre Wave ◽  
Atmospheric Remote Sensing ◽  
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 3D Printing of Millimetre Wave and Low-Terahertz Frequency Selective Surfaces Using Aerosol Jet Technology

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 177341-177350 ◽  
Author(s):  
Anshuman Shastri ◽  
Benito Sanz-Izquierdo ◽  
Edward A. Parker ◽  
Steven Gao ◽  
Patrick Reynaert ◽  
...  
Keyword(s):  
3D Printing ◽  
Frequency Selective Surfaces ◽  
Terahertz Frequency ◽  
Millimetre Wave ◽  
Frequency Selective

scholarly journals Broadband Circular Polarizer Based on Multilayer Gradual Frequency Selective Surfaces

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Wei Zhang ◽  
Jian-ying Li ◽  
Ling Wang
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Incident Angle ◽  
Reduction Factor ◽  
Frequency Selective Surfaces ◽  
Layer By Layer ◽  
Circular Polarizer ◽  
Working Frequency ◽  
Frequency Selective ◽  
Operation Frequency

This paper presents a broadband circular polarizer based on multilayer gradual frequency selective surfaces. The unit cell includes two identical circles and a bar, whose dimensions decrease layer by layer with a reduction factor. This design can provide a good phase difference that is close to 90°. The bandwidth of the polarizer reaches 66.7%, from 7.9 to 15.8 GHz, which can convert the incident linear polarization waves into circular polarization waves. A sample polarizer is fabricated and measured. The results show that the operation frequency ranges from 7.75 to 15.2 GHz, coinciding with the simulation. Meanwhile, the working frequency band covers the range of 8.2–14.5 GHz when the incident angle increases to 25°.

Nonuniformly illuminated frequency-selective surfaces

1988 ◽  
Vol 24 (14) ◽  
pp. 901 ◽  
Author(s):  
A.M.M.A. Allam ◽  
E.A. Parker
Keyword(s):  
Frequency Selective Surfaces ◽  
Frequency Selective
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