Bifunctional arbitrarily-shaped cloak for thermal and electric manipulations

Zhang, Lin; Shi, Yan

doi:10.1364/ome.8.002600

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…Metamaterials/metasurfaces have attracted much interest due to their ability to flexibly manipulate electromagnetic waves, and therefore been widely applied in various fields from * Author to whom any correspondence should be addressed. microwave to optics [1,2]. With the rapid increase of demands on radar cross section (RCS) reduction of the target in stealth radar antenna systems, various metamaterial/metasurfacebased designs have been proposed [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Ultra-wideband hybrid polarization conversion-absorption metasurface with a transmission window and narrow transition bands

Shi¹,

Chu²,

Meng³

2023

J. Phys. D: Appl. Phys.

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This paper proposes an ultra-wideband hybrid polarization conversion-absorption (PCA) metasurface with a transmission band for radar cross section (RCS) reduction application. To achieve the in-band transmission of the incident wave and the out-of-band suppression of the scattering wave, the proposed metasurface is composed of a low-frequency PCA array, a high-frequency polarization conversion (PC) array, and a second-order frequency selective surface (FSS). The lumped resistors are used in the PCA array to generate the absorption characteristic, thus giving rise to the reduction of the co-polarization component of the scattering field and meanwhile the elimination of the high-frequency resonances. An interdigital structure is introduced into the PCA array to not only achieve a good transmission for a co-polarization component of the incoming wave but also result in an extra PC band for narrowing the transition band between the transmission window and the high-frequency PCA band. The orthogonal layout of the PCA array and the PC array is used to decrease the interaction between them, thus resulting in an ultra-wideband PCA band. The second-order FSS consisting of a stacked structure is designed to generate a good passband with the steep roll-off and the good out-of-band suppression. The proposed metasurface has an ultra-wideband PCA band, a good transmission band, and narrow transition bands. When the proposed metasurface is arranged into an array in a rotation way, the ultra-wideband RCS reduction performance can be obtained. Simulated and measured results are given to demonstrate a 10 dB RCS reduction band of 3.4-24.6 GHz with a -1 dB transmission band of 8.45-10 GHz.

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Section: Introductionmentioning

confidence: 99%

Ultra-wideband hybrid polarization conversion-absorption metasurface with a transmission window and narrow transition bands

Shi¹,

Chu²,

Meng³

2023

J. Phys. D: Appl. Phys.

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“…Recently, theory of characteristic mode (TCM) has been rapidly developed in various applications including antenna design [29][30][31][32][33][34][35][36][37] and RCS reduction, 38,39 and invisible cloaks. 40,41 It can give a clear guidance for antenna design by analyzing characteristic currents and fields. Moreover, the metallic ground in TCM could act as the main radiator, and therefore the antenna design is performed by exciting the desired modes of the ground, which efficiently decrease the design complexity and size of the antenna.…”

Section: Introductionmentioning

confidence: 99%

A pattern‐reconfigurable antenna design for body area networks communications

Shi

2021

Int J RF Microw Comput Aided Eng

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This article presents a novel pattern-reconfigurable antenna based on theory of characteristic mode for body area networks (BAN) communication. The radiation pattern of the antenna is able to switch between the omnidirectional pattern and broadside pattern, which can satisfy on-body and off-body communication links simultaneously. An array of 4 Â 2 rectangular plates with the off-body communication mode at BAN frequency band is used as the main radiator, and four copper posts between the radiator and the ground are introduced to generate the on-body mode. A simple feeding network is designed to selectively excite the two modes. The footprint of the proposed antenna is 0.43 λ 0 Â 0.43 λ 0 Â 0.05 λ 0 . For demonstration, the proposed antenna has been fabricated and measured both in the free space and on the phantom. The measured results agree well with the simulated ones. Furthermore, the issue of the specific absorption rate (SAR) is studied. The peak SAR values of the proposed antenna in two communication modes are far below the Federal Communication Commission standard. In addition, for practical application, the link budget of the on-body link is investigated. The stable impedance and radiation properties, the low SAR values and the reliable communication ability make the proposed antenna be a suitable candidate for BAN communications.

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“…However, some restrictions should be noted: (I) Complementary media and superlenses are composed of negative index materials, which require the help of evanescent waves to fulfill the functions of illusion devices. Besides the above method, some other methods [32,33] for cloaking and illusions are also interesting, for example, characteristic mode method, [34] metasurface method. (II) The introduction of negative index materials inevitably makes the device loss sensitive, which is a key factor limiting its performance.…”

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confidence: 99%

“…This method has also been employed to design absorbers and invisibility cloaks. Besides the above method, some other methods [32,33] for cloaking and illusions are also interesting, for example, characteristic mode method, [34] metasurface method. A similar method has been proposed recently to design all-dielectric cloaks, [31] which eliminates two symmetrical areas of scattering potentials in the 2D wave vector domain to make the object invisible within a specified frequency band, and the symmetric conditions ensure that the material has no loss or gain.…”

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confidence: 99%

“…A similar method has been proposed recently to design all-dielectric cloaks, [31] which eliminates two symmetrical areas of scattering potentials in the 2D wave vector domain to make the object invisible within a specified frequency band, and the symmetric conditions ensure that the material has no loss or gain. Besides the above method, some other methods [32,33] for cloaking and illusions are also interesting, for example, characteristic mode method, [34] metasurface method. [35] Our method has several advantages compared with the conventional TO method: first, no external devices are needed in our design because we only slightly modify the scattering potential of the object and the nearby surroundings, which is more of a cosmetic operation for an object; second, no negative refractive index materials are introduced, which is a key factor restricting the effect of the illusion; third, all of the materials are isotropic, nonmagnetic, and with relative permittivity above unity, which makes this method more feasible for real applications of illusion.…”

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confidence: 99%

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Illusion Optics: Disguising with Ordinary Dielectric Materials

Liu

Guo

2018

Advanced Materials

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complementary medium by a superlens in order to cancel the scattering of object A, and then to shift another object (B) into the position of object A, therefore, when we detect the scattering pattern we will find that object A appears like object B. TO is a strict method to design illusion devices in theory. However, some restrictions should be noted: (I) Complementary media and superlenses are composed of negative index materials, which require the help of evanescent waves to fulfill the functions of illusion devices. Therefore, in order to ensure the performance of the illusion, the external device (superlens) and the object should be as close as possible (in the near field) to receive adequate evanescent waves. (II) The introduction of negative index materials inevitably makes the device loss sensitive, which is a key factor limiting its performance. (III) The material parameters of the device are very complex, including negative index materials, magnetic materials, anisotropic materials, etc. These are a few of the main reasons why these illusion devices are too difficult to put into real applications.In addition to the method of TO, a new way to artificially manipulate electromagnetic waves has been proposed in 2015 by using spatial Kramers-Kronig (KK) media. [26] This method modifies the scattering potentials in the wave vector domain and makes the scattering potentials zero in the backward direction, that is, no reflections. This method has also been employed to design absorbers and invisibility cloaks. [27][28][29][30] Due to the asymmetrical properties of the scattering potentials, these KK media always require complex materials (with loss or gain). A similar method has been proposed recently to design all-dielectric cloaks, [31] which eliminates two symmetrical areas of scattering potentials in the 2D wave vector domain to make the object invisible within a specified frequency band, and the symmetric conditions ensure that the material has no loss or gain. Besides the above method, some other methods [32,33] for cloaking and illusions are also interesting, for example, characteristic mode method, [34] metasurface method. [35] Our method has several advantages compared with the conventional TO method: first, no external devices are needed in our design because we only slightly modify the scattering potential of the object and the nearby surroundings, which is more of a cosmetic operation for an object; second, no negative refractive index materials are introduced, which is a key factor restricting the effect of the illusion; third, all of the materials are isotropic, nonmagnetic, and with relative permittivity above unity, which makes this method more feasible for real applications of illusion. Now we show the designing method by deducing the relation between the scattering amplitude and the Fourier component of the scattering potential. Considering the 2D case (in

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Bifunctional arbitrarily-shaped cloak for thermal and electric manipulations

Cited by 18 publications

References 34 publications

Ultra-wideband hybrid polarization conversion-absorption metasurface with a transmission window and narrow transition bands

Ultra-wideband hybrid polarization conversion-absorption metasurface with a transmission window and narrow transition bands

A pattern‐reconfigurable antenna design for body area networks communications

Illusion Optics: Disguising with Ordinary Dielectric Materials

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