Smartphone Frequency Shielding With Penta-Bandstop FSS for Security and Electromagnetic Health Applications

Yadav, Sanjeev; Jain, C. L.; Sharma, Mahendra Mohan

doi:10.1109/temc.2018.2839707

Cited by 62 publications

(30 citation statements)

References 28 publications

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“…A single layer FSS with five notch frequencies has been devised on one side of an FR4 substrate of 1.6 mm thickness [10]. The unit cell contained five square and modified square metal rings that determined the occurrence of the five notch frequencies in the range 1.5-5.5 GHz for a 27 mm side length of the unit cell.…”

Section: Motivationmentioning

confidence: 99%

“…Such filters are FSS's realized on printed circuit boards (PCB's) by printing and etching either one face (single layer [7]) or both faces (double layer) of the board with a periodic metal pattern. The resulting transmission coefficient of the FSS may exhibit a large stop-band [4], a pass-band [5], one stop-band [6], two stop-bands [7], [8], three stop-bands [9] or even five stop-bands [10].…”

Section: Introductionmentioning

confidence: 99%

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Frequency Selective Surface With Two Quasi-Independent Notch Frequencies

2019

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A double-layer frequency selective surface (FSS) built on FR4 substrate exhibiting two notch frequencies in the 0-10-GHz range is introduced. Recently published examples demonstrate that further research needs to be undergone for obtaining separate tuning of the resulted notch frequencies. Thus, this issue is addressed in this paper: the notch frequencies can be quasi-independently set by appropriate values given to the geometrical parameters of the two metal patterns in the unit cells of the structure. The FSS behavior is stable with respect to the angle of incidence of impinging electromagnetic waves up to 45 • , as proved by simulation and validated by experiments. INDEX TERMS Frequency selective surface (FSS), notch filter, angular stability.

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Section: Motivationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Frequency Selective Surface With Two Quasi-Independent Notch Frequencies

2019

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“…The unit element of the design measures 0.135 λ o . 18 Another very recent work presents a pentaband FSS with 0.1 λ o unit element size. The design suppresses the lowest band at 1.9 GHz where the highest band is in the radar operating frequency around 7.45 GHz.…”

Section: Introductionmentioning

confidence: 99%

“…The design has angular stability up to 45° whereas measured angular stability for transverse magnetic (TM) polarized incident wave is not explored. The unit element of the design measures 0.135 λ o . 18 Another very recent work presents a pentaband FSS with 0.1 λ o unit element size. The design suppresses the lowest band at 1.9 GHz where the highest band is in the radar operating frequency around 7.45 GHz.…”

Section: Introductionmentioning

confidence: 99%

Polarization insensitive penta‐bandstop frequency selective surface for closely placed bands

Farooq

Iftikhar

Shafique

et al. 2020

Micro & Optical Tech Letters

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This article reports on a single layer penta-bandstop frequency selective surface (FSS) for multiband shielding applications. The proposed unit cell incorporates five independent resonant elements that are realized on a single-sided FR4 substrate to suppress GSM-0.9 GHz, GPS-1.5 GHz, GSM-1.8 GHz, Wi-Max-3.5 GHz, and Wireless Local Area Network (WLAN)-5.7 GHz frequency bands. The proposed single layer unit cell has compact lattice periodicity of order 0.11 λ o × 0.11 λ o. The design is not only polarization-insensitive, but it also offers high angular stability up to 45. A detailed parametric analysis is conducted to establish a relationship between geometrical parameters and FSS spectral response. Additionally, an equivalent lumped circuit model is also derived to further elaborate on the underlying resonance mechanism. A prototype is fabricated and tested to validate the performance of the proposed FSS. The measured results are in good agreement with simulated ones. The proposed FSS has the uniqueness of suppressing 0.9 GHz GSM band that has never been reported in a pentaband design. The proposed FSS is a potential candidate for radio frequency (RF) shielding, electromagnetic wave suppression, and data security applications in secure installations.

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“…Owing to the frequency filter property, FSSs have been applied across the entire electromagnetic spectrum to reflect or transmit electromagnetic waves in some desired frequency bands. At microwave and millimeter wave frequencies, FSSs reduce electromagnetic interference and radar cross section of antennas in military systems and are being designed to offer a wide range of filter responses in multiband or broadband systems …”

Section: Introductionmentioning

confidence: 99%

Polarization independent quad‐bandpass frequency selective surfaces with wide‐band ratio

Yadav¹,

Jain²,

Sharma

2018

Int J RF Microw Comput Aided Eng

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A single layer polarization independent quad-bandpass frequency selective surface (FSS) with wide-band ratio is demonstrated theoretically as well as experimentally. The proposed structure passes four frequency bands with wide band ratio. The proposed FSS design is implemented by incorporating alternate arrangement of four units which are rotated 90 clockwise to form a unit cell of metal over a FR4 substrate. The geometrical dimensions of proposed unit cell are optimized and arranged in such a way that the structure possesses the quad bandpass characteristic and aspect dimensions of one unit is 0.11λ × 0.11λ with respect to first resonant frequency. This FSS provides stable response for different angle of incidence in transverse electric (TE) mode and transverse magnetic (TM) mode. To validate the results proposed FSS array has been fabricated and measured in free space environment. The measured results are in good agreement with the simulated results. Excellent stability is also observed for different incident angle. K E Y W O R D Sband ratio, frequency selective surface, polarization independent, quad bandpass

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Smartphone Frequency Shielding With Penta-Bandstop FSS for Security and Electromagnetic Health Applications

Cited by 62 publications

References 28 publications

Frequency Selective Surface With Two Quasi-Independent Notch Frequencies

Frequency Selective Surface With Two Quasi-Independent Notch Frequencies

Polarization insensitive penta‐bandstop frequency selective surface for closely placed bands

Polarization independent quad‐bandpass frequency selective surfaces with wide‐band ratio

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