FSS seminar-cours-work the future of material surfaces.pptx

An FSS-based Conformal Band-stop Filter Design
for Planar and Non-planar Surfaces
INDIAN INSTITUTE OF TECHNOLOGY INDORE
AKHILA GOUDA
Supervisor – Dr. Saptarshi Ghosh
Dept. Of Electrical Engineering, IIT Indore

Brief Overview of the Presentation
 Basic of Frequency selective surface (FSS)
 Applications of FSS
 Literature Reviews
 Key Challenges in Research Work
 Problem Statement and Deliverables
 Proposed Research Works [till date]
 Conclusion and Future Works

 A frequency selective surface (FSS) is a periodic surface, which
selectively controls the frequency characteristics of the incident
electromagnetic (EM) wave.
 The response depends on the shape of the structure as well as the
polarization and incident angle of the incident wave.
[1] F. Bayatpur, K. Sarabandi, “Miniaturized FSS and patch antenna array coupling for angle-independent, high-order spatial Filtering,” IEEE Microw.
Wireless Component Lett., vol. 20, no. 2, Feb. 2010.
Frequency Selective Surface (FSS)
Unit cell
Frequency (GHz)
S21
(dB)
Frequency (GHz)
S21
(dB)
Frequency (GHz)
S21
(dB)
Frequency (GHz)
S21
(dB)
Low Pass High Pass Band Pass Band Stop

 Spatial filters
 Radomes
 Antennas
 Parabolic reflectors
 Polarizers
 Absorbers
 Electromagnetic Shielding
Parabolic reflector
Polarizer
Applications of FSS
Radomes Absorber
Antennas Electromagnetic Shielding

1. FSS-based filters are designed for planar
configuration.
 Difficult to install on non-planar/ asymmetrical surfaces
2. When planar FSS wrapped on conformal surface
distortion comes in the edge and at the apex.
3. Wrapping is not possible to complex non planar
surface (Example: hemispherical shape)
4. During oblique incidence, the response deteriorates.
5. Impedance Matching Criteria
Limitations in Existing FSS
M. Bilal, R. Saleem, Q. H. Abbasi, B. Kasi, and M. F. Shafique, “Miniaturized and Flexible FSS-Based EM Shields for Conformal Applications,” IEEE Trans.
Electromagn. Compat., vol. 62, no. 5, pp. 1703–1710, Oct. 2020, doi: 10.1109/TEMC.2019.2961891
0
11
0
in
in
Z Z
S
Z Z



Normal incidence
TE mode:
0
11
0
cos cos
cos cos
in i t
TE
in i t
Z Z
S
Z Z
 
 



TM mode: 0
11
0
cos cos
cos cos
in t i
TM
in t i
Z Z
S
Z Z
 
 



Oblique incidence
Practical applications involve
non-planar surfaces

Unit cell Dimensions: a = 10 mm,
b = 8.8 mm, w = 1 mm, th = 0.5 mm
TE - Mode TM - Mode
TE - Mode TM - Mode
 One Square loop based geometry is considered
 Dielectric substrate (blue color): Polyacitic acid (PLA)
[dielectric constant = 2.1; loss tangent = 0.07]
 Metallic pattern (brown color): Copper metal
[thickness = 0.0354
mm]
Polarization angle variation
Incident angle variation
Proposed work

FE-BI Boundaries
(a)
ч λ/4
Planar surface 25 × 25 unit cells
Copper layer
PLA Substrate
Finite FSS structures are simulated using the finite element boundary integral
(FEBI).
• Advantages of FEBI set up:
• Alternative to radiation and PML boundary condition
• Arbitrary shape boundary
• No theoretical minimum distance from radiator
• Reduce the computational complexity
Research Activity till date: Planar

(b)
Cylinder Y- Curve 25 × 25 unit cells
Radius = 80 mm
Height = 250 mm
Y-curve surface
(c)
Cylinder X - Curve 25 × 25 unit cells
X-curve surface
(e)
Hemispherical shape
Hemispherical shell
Radius = 100 mm
(d)
XY - Curve 25 × 25 unit cells
,
Elliptical Paraboloid
Research Activity till date: Conformal
Comparison Results: Unit cell,
Planar and
Conformal structures

1. The proposed structure behaves the band stop characteristics in X-
band for both planar and the conformal structure.
2. All the consideration structures transmission coefficient S21 is below
-10 dB for all shapes except hemispherical ones.
3D Printer
Fabricated Prototype and Measurement results

Transmission (S21) measure
Free space measurement technique
Measurement under normal incidence
Measurement under oblique incidence
14
Research Activity: Measurement Procedure

Conclusion and Future works
• Conformal FSS design
• Using different mapping technique to make it more periodic.
• Higher packing fraction for more compactness
• Higher angular stability
• Wideband width
• X–band FSS-based band-stop filter is designed for various non-planar environments. The unit cell is
periodically patterned on different types of surfaces (cylindrical, elliptical paraboloid, hemispherical), and
their EM characteristics are analyzed under different polarization as well as incident angles using the FEBI
setup.
• Afterward, 3-D printing technology is employed to fabricate the structures, and their measured responses
are plotted, the measured results and the simulated results are closely matching, which validating the
proposed concepts.
Conclusion
Future works

1. B. A. Munk, Frequency Selective Surfaces: Theory and Design, New York,
NY, USA: Wiley, 2000
2. S. Dey and S. Dey, “Conformal Miniaturized Angular Stable Triband Frequency Selective Surface for EMI Shielding,” IEEE Trans. Electromagn.
Compat., pp. 1–11, 2022, doi: 10.1109/TEMC.2022.3153998.
3. M. Bilal, R. Saleem, Q. H. Abbasi, B. Kasi, and M. F. Shafique, “Miniaturized and Flexible FSS-Based EM Shields for Conformal Applications,”
IEEE Trans. Electromagn. Compat., vol. 62, no. 5, pp. 1703–1710, Oct. 2020, doi: 10.1109/TEMC.2019.2961891.
4. P.-S. Wei, C.-N. Chiu, C.-C. Chou, and T.-L. Wu, “Miniaturized Dual-Band FSS Suitable for Curved Surface Application,” IEEE Antennas Wirel.
Propag. Lett., vol. 19, no. 12, pp. 2265–2269, Dec. 2020, doi: 10.1109/LAWP.2020.3029820.
5. S. Ghosh and S. Lim, “A Miniaturized Bandpass Frequency Selective Surface Exploiting Three-Dimensional Printing Technique,” IEEE Antennas
Wirel. Propag. Lett., vol. 18, no. 7, pp. 1322–1326, Jul. 2019, doi: 10.1109/LAWP.2019.2915048.
6. R. Anwar, L. Mao, and H. Ning, “Frequency Selective Surfaces: A Review,” Appl. Sci., vol. 8, no. 9, p. 1689, Sep. 2018, doi:
10.3390/app8091689.
7. I. M. Ehrenberg, S. E. Sarma, and B.-I. Wu, “Fully conformal FSS via rapid 3D prototyping,” in Proceedings of the 2012 IEEE International
Symposium on Antennas and Propagation, Chicago, IL, USA, Jul. 2012, pp. 1–2. doi: 10.1109/APS.2012.6348601.
1. Akhil Gouda, Rabindra K. Mishra, and Saptarshi Ghosh, “An FSS-based Conformal Band-stop Filter design for Planar and
Non-planar Surfaces”, Accepted for oral presentation in IEEE Microwave, Antennas, and Propagation Conference (MAPCON
2022), Banglore, December 12-15, 2022.
2. Akhil Gouda, and Saptarshi Ghosh, “3-D Printed Non-Planar Frequency Selective Surfaces for Electromagnetic Shielding
Applications” (Submitted to IEEE Antennas Wireless Propagation Letter)
Reference
Research publications
Research Activity: Measurement Procedure
Reference

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