Transmitting-absorbing material based on resistive metasurface

Meng, Fan-Guang; Li, Hao; Fan, Dian; Li, Feifei; Xue, Feng-Zhi; Chen, Pïng; Wu, Rui‐Xin

doi:10.1063/1.5037772

“…Which is taken as a function of the incident frequency ( , subwavelength thickness ( ), and effective permittivity of the metasurface ( . The explicit analytical expression of surface resistance ( ) for resistive metasurface is given as , as reported and numerically simulated in 31 .…”

Section: Resultsmentioning

confidence: 99%

Electromagnetic surface waves supported by a resistive metasurface-covered metamaterial structure

Yaqoob¹,

Ghaffar²,

Alkanhal³

et al. 2020

Sci Rep

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This study examines the analytical and numerical solution of electromagnetic surface waves supported by a resistive metasurface-covered grounded metamaterial structure. To simulate the metamaterial, the Kramers–Kronig relation based on the causality principle is used, while the modeling of the resistive metasurface has been done by implementing the impedance boundary conditions. The analytical expressions for the field phasors of surface waves are developed for the transverse magnetic (TM) polarized mode and transverse electric (TE) polarized mode. The characteristic equations are computed for both modes, and the unknown propagation constant is evaluated numerically in the kernel. After computation, the dispersion curves, electric field profiles, effective mode index ($$N_{eff}$$ N eff ), and phase speeds ($$v_{p}$$ v p ) are presented for both the TM and TE polarized modes. To study the tunability of surface waves, the influence of the thickness of the metamaterial slab ($$d$$ d ), effective permittivity of the metamaterial ($$\varepsilon_{1}$$ ε 1 ), thickness of the resistive metasurface ($$t$$ t ), and effective permittivity of the metasurface ($$\varepsilon_{r}$$ ε r ) on all the numerical results has been studied. However, the geometrical parameters are found to be more sensitive to the effective mode index ($$N_{eff}$$ N eff ) and phase speed ($$v_{p}$$ v p ) of the surface waves. The results are consistent with the published results, which reflects the accuracy of the work. It is concluded that the appropriate choice of parameters can be used to achieve surface waves with the desired characteristics in the GHz range. The present work may have potential applications in surface waveguide design, surface wave speed controllers, surface communication devices, and light trapping configurations.

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“…6. The significance of the PAS layer is to absorb the out-of-band frequencies and let in the in-band (X-band) frequencies, whereas the PRS layer is to reflect the part of out-of-band frequencies that penetrate through the PAS layer and also band-pass in-band frequencies [15]. The combination of all these layers, i.e., superstrate with PAS and PRS layers and patch antenna with MA contributes to partially reflecting and absorbing surface (PRAS) antenna.…”

Section: Single Patch Antenna With Superstratementioning

confidence: 99%

“…This layer acts as a partially absorbing surface (PAS). Here, hexagonal element is selected in view of its advantage of having wider bandwidth [13][14][15]. A rectangular-shaped slot element is introduced at the center of the unit cell in order to disturb the continuous surface current distribution, thereby improving scattering characteristics.…”

Section: Introductionmentioning

confidence: 99%

Superstrate-based patch antenna array with reduced in-band radar cross section

Das¹,

Singh

²

,

Gurap³

et al. 2021

Int. J. Microw. Wireless Technol.

1

0

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To design a low radar cross section (RCS) antenna, the major concern is not only to reduce scattering, but also to maintain its radiation parameters, viz. gain, voltage standing wave ratio (VSWR), etc. This paper presents a simple configuration of low RCS microstrip patch array with a periodic structure-based superstrate. The ground of the array is designed as reduced ground plane with high impedance surface elements, viz. rectangular patch and Jerusalem cross. The configuration of superstrate consists of multilayered, viz., two-layered and three-layered structures having partially absorbing and reflecting surfaces. In both the proposed configurations, the array gain of 12.5 dB is maintained with reduced structural RCS over the entire in-band frequency range. The reflection coefficient (~ −20 dB) and VSWR (~ 1.1) of the array are maintained. It is shown that the proposed superstrate-based patch array design has significantly reduced in-band RCS (−18 dBsm) at its resonant frequency.

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“…Out-of-band reflection can be decreased by installing a band-stop lossy structure on the radome, but high in-band transmission must also be guaranteed for the system to function properly. The FSS rasorber can be classified into three different categories in terms of their frequency response and placement of transmission (T), and absorption (A) bands [6]: (i) The transmission band is followed by the absorption band (TA-configuration) [7], (ii) The absorption band is followed by the transmission band (AT-configuration) [4,8], and (iii) The transmission band lies between the two absorption bands, i.e., absorption-transmission-absorption (ATA-configuration) [2,3,5,[8][9][10][11]. Amongst these configurations, the ATA FSS has received the highest attention because of its frequency response, which is more suitable for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Polarization-insensitive graphene-based THz rasorber with ATA characteristics

Ali,

Bhattacharya

2023

Phys. Scr.

2

0

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This paper presents a polarization-insensitive rasorber implemented with absorption-transmission-absorption (ATA) characteristics over three consecutive frequency ranges in the terahertz (THz) band. The proposed rasorber is made of a two-layer periodic structure. These two layers are separated by a spacer made of glass substrate. The unit cells of the top layer have a modified swastika geometry metallization, which is loaded with graphene strips to make it lossy and provide dual-band absorption. In the bottom plane frequency selective surface (FSS), a square ring is engraved on the metal layer to obtain bandpass characteristics between two stopbands provided by the top layer. The designed rasorber works in the 0.2 – 1.2 THz frequency range. It provides wideband absorption with a S 11 < − 10 dB from 0.274 to 1.094 THz with a fractional bandwidth (BW) of around 118 % . An in-band transmission window is designed with a S 21 > − 3 dB in the frequency of 0.615 to 0.719 THz provides a large BW of 104 GHz ( 15.59 % ) for THz communication. Within this transmission band, the lowest insertion loss of 0.27 dB is obtained at 0.686 THz. It provides the absorption of more than 80 % in both the lower band ( 0.276 – 0.442 THz, 46.24 % BW) and the higher band ( 0.861 – 1.094 THz, 23.83 % BW). The simulated response of the designed rasorber using a full-wave electromagnetic simulator and calculated through ECM are found to be in good agreement.

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Transmitting-absorbing material based on resistive metasurface

Cited by 11 publications

References 32 publications

Electromagnetic surface waves supported by a resistive metasurface-covered metamaterial structure

Electromagnetic surface waves supported by a resistive metasurface-covered metamaterial structure

Superstrate-based patch antenna array with reduced in-band radar cross section

Polarization-insensitive graphene-based THz rasorber with ATA characteristics

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