Performance Evaluation of Annular Ring Frequency Selective Surface for Different Substrate Materials

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Rohit Mathur1, Ankush Prajapat2, K.K.Arora3

1, 2,3Jodhpur Institute of Engineering & Technology, Mogra, Jodhpur, India

OUTLINE

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» Introduction» Factors Influencing The FSS Performance » Platform Of Research» Proposed Design For Dual Band Application» Simulation Results» Conclusion» Future Developments» References

INTRODUCTION

» The frequency selective surfaces (FSS) are periodic structures which perform a filter operation at Microwave frequency .

» FSS is based on Resonance. » When EM-wave incident on array of metallic elements, thus

exciting electric current on the elements.» The amplitude of the generated current depends on the

strength of the coupling of energy between the wave and the elements. The coupling reaches its highest level at resonant frequency, when the length of elements is a λ/2.

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» Hence elements are shaped so that they resonant near the frequency of operation.

» Depending on their physical construction, material and geometry, they are divided into low-pass, high-pass, band-pass and band-stop filters.

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FACTORS INFLUENCING THE FSS PERFORMANCE

The performance and behavior of the FSS depends on the following factors:

(1) The geometry of the FSS element. (shape, thickness of Conductive striplines, proximity of Conductive striplines, elevation of conductor)

(2) The conductivity of the FSS conductor.

(3) The permittivity of the FSS substrates.

(4) The period of the FSS array.

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(5) The number of FSS arrays when these are employed in a cascade.

(6) The electrical distance between the FSS arrays in cascade configurations.

(7) The choice of element types in hybrid FSS configuration.

(8) Metallic frames surrounding the FSS window.

PLATFORM OF RESEARCH CST Microwave Studio Is used for the modelling of frequency

selective surfaces. it enables the fast and accurate analysis of antennas, filters, couplers, planar and multi-layer structures .

Transient solver for efficient calculation for loss-free and lossy structures. The solver does a broadband calculation of S-parameters from one single calculation run by applying MOM to time signals.

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PROPOSED DESIGN FOR DUAL BAND APPLICATION

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Square Patch Length {L} 12mm

Square Patch Width {W} 12mm

Ring 1 Inner Radius{r1} 1mm

Ring 1 Outer Radius{r2} 2.8mm

Ring 2 Inner Radius{r3} 3mm

Ring 2 Outer Radius{r4} 4.8mm

Width of Dielectric/FR4{Wd}/ Teflon/ Mica 1.56mm

Width of Conductor{Wc} 0.03mm

Design Parameter for Single Cell of Annular Ring Frequency Selective Surface

10Simulation performance of S-parameters of annular ring

SIMULATION RESULTS

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Frequency response of FSS for different Substrate Material in C band

12Frequency response of FSS for different Substrate Material in X

band

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ASPECT FIRST BAND SECOND BAND

Resonating Frequency (GHz) 6.2205 10.772

Bandwidth (GHz) 0.3986 0.5764

Percentage Bandwidth 6.40 5.37

Simulated Transmission Band for the Given Design

» Specific characteristics that have been focused in this work are: the dependence of the frequency-selective surface on the incidence angle of the exciting wave, shapes of metallic patches or slots, the dimensions of the periodic elements, dielectric substrate used and the lattice structure.

» With the variation of Space between inner rings we can shift the resonance frequency in higher band of interest (X-band) whereas by varying Space between outer rings we can shift the resonance frequency in lower band of interest (C-band).

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CONCLUSION

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if we change the characteristic property of the substrate i.e Mica Teflon and FR4 the shifting is also changing.

It is observed that the use of annular ring FSS of simple conducting element on various dielectric materials can be used to obtain dual-band response with appreciable shift in frequency

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FUTURE DEVELOPMENTS

Presently, frequency selective surfaces are in use have single base conducting surface i.e copper were observed with different dielectric material.

If we observe the Frequency response of FSS at different Substrate Material then we can observe a band ratio equal to1.7 (Approx.) which proves the linear relationship between shift bands.

Further we can observe the different surfaces other then copper and obtain a linearity relationship of band shifts with base material (FSS) band application and some dual band FSS are have

References

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Thank you for your attention!

ROHIT MATHURr4rohitmathur@gmail.com+91-9929240907

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