Epsilon near zero metasurface for ultrawideband antenna gain enhancement and radar cross section reduction

Philipose, Usha; Chitra, K.

doi:10.1016/j.aeue.2020.153167

Cited by 20 publications

(5 citation statements)

References 40 publications

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“…[22] Although some geometric-phase metasurfaces can realize parallel phase profiles as well as dispersion profile manipulation, these devices suffer from poor broad bandwidth performance. [23][24][25][26] Focus-scanning technology realized by an individual metadevice has important applications, such as multiple modes of phased-array radar scanning, [27] synthetic aperture radar (SAR) imaging, [28][29][30][31] sensing, and communications. [32,33] However, the reported focusing meta-devices [34,35] usually work only at a target frequency or a particular range of frequencies; therefore, these cannot achieve a high broad bandwidth performance.…”

Section: Introductionmentioning

confidence: 99%

“…Focus‐scanning technology realized by an individual meta‐device has important applications, such as multiple modes of phased‐array radar scanning, [ 27 ] synthetic aperture radar (SAR) imaging, [ 28–31 ] sensing, and communications. [ 32,33 ] However, the reported focusing meta‐devices [ 34,35 ] usually work only at a target frequency or a particular range of frequencies; therefore, these cannot achieve a high broad bandwidth performance.…”

Section: Introductionmentioning

confidence: 99%

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Frequency‐Controlled Focusing Using Achromatic Metasurface

Zheng

Cai

et al. 2020

Advanced Optical Materials

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Frequency‐controlled metasurfaces have attracted significant attention for a variety of applications, such as radar imaging and 5G communication, owing to their small size and low cost. However, due to the inherent material dispersion of these devices, bandwidth is an essential requirement for their controlling their wavefront. To evaluate the broadband performance of frequency‐controlled metasurface focusing systems, a multiresonant model is used to achieve controlled manipulation of frequency‐splitting and focusing reflective metasurface; further, the transition from broadband disorder scattering to user‐desired reflection is obtained. It is shown that the focusing position can be controlled by the careful design of each unit cell. As a proof of concept, a broadband focusing metasurface with frequency‐splitting effect over the entire X band, i.e., 8–12 GHz, is designed and experimentally demonstrated, which can control the position of focal spots with different wavelengths by its achromatic and reflective characteristics. It is believed that the proposed metasurface will provide useful insights for wavefront manipulation in broadband and chromatically corrected imaging systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Frequency‐Controlled Focusing Using Achromatic Metasurface

Zheng

Cai

et al. 2020

Advanced Optical Materials

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“…Cutting two half ring slots in the circular patch changes the overall impedance and resonance properties of the structure by adding additional capacitance and inductance. Various models have been presented in literature to predict the behaviour of the metamaterial unit cells [22,[28][29][30]. The field distribution within the patch structure also gets modified, and it leads to changes in the effective permittivity permeability of the unit cell.…”

Section: Metamaterials Unit Cell Design and Analysismentioning

confidence: 99%

“…3-D Metamaterial lenses have also been used for the high gain and broadband performances by concentrating the radiated energy in the desired direction. The bulky and multilayer complicated structure of 3-D metamaterial might be expensive; hence planar structures are preferred [21,22]. Single layer ENZ metasurfaces [23] are the new substitute to the bulky lenses.…”

Section: Introductionmentioning

confidence: 99%

Planar Multi Notch Band Antenna In-band Gain Enhanced by Epsilon-near-zero Non-absorptive Metasurface

Philipose¹,

Kumar²,

Chitra³

2023

PIER C

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This paper presents the design, fabrication, and characterization of a novel single layer nonabsorbing metasurface with a broadband epsilon near zero (ENZ) property and its application in-band gain enhancement of triple notch band ultra-wideband (UWB) antenna. The proposed metasurface is made up of non-resonant metamaterial unit cells consisting of half ring slots in a circular patch on an FR4 dielectric substrate. Metasurface with unit cells arranged in a 2 × 2 lattice pattern is suspended 4 mm above the triple notch band antenna. The transmission and reflection properties of the metamaterial unit cell are analysed and optimised to ensure the coherent transmission from the metasurface. The non-absorbing property of the metasurface results in the minimal loss of electromagnetic waves. The proposed antenna system with metasurface has a size of 28 × 28 × 7.2 mm 3 . The measured results of fabricated antenna are compared with the simulated ones and are in good match. The results show that the gain of the antenna was enhanced by 1.3 dB, 2.8 dB, and 4 dB at 5 GHz, 7 GHz, and 9 GHz, respectively.

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“…Thus, metallic baffles are added on the upper and lower sides of the antenna to reduce the beamwidth, but it will lead to the deterioration of SLL 1 . In recent years, near‐zero‐index metamaterials (NZIMs) are increasingly used to improve antenna performance 10–13 . When the electromagnetic waves propagate outward from the interior of the zero‐index material, the exit direction is perpendicular to the surface of the material.…”

Section: Introductionmentioning

confidence: 99%

Low‐sidelobe marine radar microstrip array antenna based on hybrid algorithm and metamaterial

Lin

Fang

Liu

2021

Int J RF Microw Comput Aided Eng

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A microstrip array antenna with low sidelobe level (SLL) for X‐band marine radar is proposed. The antenna is composed of a 32‐element patch array and a three‐layer near‐zero‐index metamaterial (NZIM). The IABC‐Kmeans algorithm, which combines the improved artificial bee colony algorithm and K‐means clustering algorithm, is used to optimize the current amplitude of the array elements to obtain a lower SLL. The NZIM is loaded in front of the array antenna to reduce the beamwidth of the E‐plane. The antenna is designed and fabricated. The measurement results show that the gain of the antenna at the center frequency is 22.7 dBi, the SLLs of H‐plane and E‐plane are −30.66 dB and − 26.78 dB respectively, and the half‐power beamwidth of H‐plane is 5.9°. Compared with the previous similar antenna structures, the antenna has lower SLL under the premise of narrow beam and high gain, which is very suitable for X‐band marine radar of small and medium fishing vessels.

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Epsilon near zero metasurface for ultrawideband antenna gain enhancement and radar cross section reduction

Cited by 20 publications

References 40 publications

Frequency‐Controlled Focusing Using Achromatic Metasurface

Frequency‐Controlled Focusing Using Achromatic Metasurface

Planar Multi Notch Band Antenna In-band Gain Enhanced by Epsilon-near-zero Non-absorptive Metasurface

Low‐sidelobe marine radar microstrip array antenna based on hybrid algorithm and metamaterial

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