Ultrathin microwave metamaterial absorber utilizing embedded resistors

Kim, Young Ju; Hwang, Jang‐Sun; Yoo, Young Joon; Khuyen, Bui Xuan; Rhee, Joo Yull; Chen, Xianfeng; Lee, YoungPak

doi:10.1088/1361-6463/aa82f4

Cited by 66 publications

(31 citation statements)

References 23 publications

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“…The reflection band can be enhanced by the half-wavelength space resonator. On the other hand, the electromagnetic wave will be absorbed by resistors at two sides of the MBSR [12] on the absorption band.…”

Section: Implementation and Analysis Of The Afsr Designmentioning

confidence: 99%

An Absorptive Frequency Selective Reflector With Wide Reflection Band

Guo

Jia

et al. 2020

IEEE Access

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In this paper, an absorptive frequency selective Reflector (AFSR) with wide reflection band is proposed. The structure is divided into two layers: a resistive sheet at the top layer, and PEC at the bottom layer, divided by polymethacrylimide (PMI) foam. The resistive sheet layer is composed of a multiple bended strip resonator (MBSR) in the center and two metallic strips loaded with resistors beside MBSR. Two metallic strips loaded with resistors can be equivalent to serial RLC, and the MBSR can be equivalent to parallel LC circuit. The MBSR is mainly used to realize absorption performance beside reflection band and contribute to one of the reflection bands with different resonant modes. The resonant frequencies are adjusted to obtain the wider reflection band. Full-wave simulation results show that the reflection band of the proposed AFSR cover from 8.94 GHz to 15.1 GHz with |S 11 | > −1 dB. The relative bandwidth is 52%. Compared with the earlier reported AFSR, this proposed AFSR owns the widest reflection band and simple structure. In addition, the absorptive bands with |S 11 | < −10 dB are separately located at 3.6 GHz-6.11 GHz and 15.23 GHz-16.19 GHz. The analysis and the design are presented in this paper. To evaluate the effectiveness of the design, the prototype of the proposed AFSR was fabricated and measured. The measured results are in good agreement with the simulated results.

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Section: Implementation and Analysis Of The Afsr Designmentioning

confidence: 99%

An Absorptive Frequency Selective Reflector With Wide Reflection Band

Guo

Jia

et al. 2020

IEEE Access

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“…A metasurface is a two-dimensional planar case of metamaterials, which is an artificial composite surface composed of subwavelength unit structures with electrical or magnetic resonance [7][8]. According to different stealth mechanisms, metasurfaces can be divided into absorbing metasurfaces [9][10][11] and scattering control metasurfaces in the microwave frequency band. However, the absorption mechanism of an absorbing metasurface is to convert electromagnetic wave energy into heat energy and dissipate it, which increases the probability of being detected by infrared detectors.…”

Section: Introductionmentioning

confidence: 99%

Multiple Diffuse Coding Metasurface of Independent Polarization for RCS Reduction

Han

Chang

et al. 2020

IEEE Access

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In this paper, a multiple diffuse coding metasurface (MDCM) of independent polarization is designed to control the propagation direction of diffuse reflections under different polarizations and to improve the monostatic and bistatic RCS (radar cross section) reduction effect. First, a method for controlling the distribution range and propagation direction of the diffuse field is studied, and the diffuse field distribution of the random phase metasurface is optimized by a genetic algorithm to improve the uniformity of the diffuse scattering distribution. Then, the random phase distribution is superimposed on the periodic gradient phase distributions of the linear and hedge types in the orthogonal direction so that the main propagation direction of the diffuse metasurface deviates from the specular reflection region under different polarizations, showing single and two diffuse beams. Finally, the anisotropic unit cell with a rectangle inside and an improved Jerusalem cross on the outside is employed as the basic coding element of the MDCM due to its independent polarization phase response. The numerical and experimental results show that the MDCM features multiple diffuse scattering, independent polarization and angle insensitivity and can efficiently improve the monostatic and bistatic RCS reduction effect simultaneously. Because the scattered energies are redirected away from the specular reflection direction, the specular scattering reduction effect is better than the isotropic diffuse metasurface. The proposed method increases the difficulty of detection by single or netted radar and has the potential for the applications of stealth techniques.

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“…As a kind of special methodology, metamaterials have been widely used not only in the military field, for example, EM stealth [5][6][7], but also in the civil field, such as solar energy harvesting [8] and biological sensing [9]. Since Landy et al proposed a late-model perfect metamaterial absorber (MA) which can obtain an absorptivity rate of 99% at a specific frequency [10], MAs with the framework of metal-substrate-metal have been rapidly developed [11][12][13][14], which were generally based on electric or magnetic resonances and had the property of flexible adjustable absorption frequency by changing the geometrical parameters of the unit cell. Besides, traditional radar absorbing materials (RAMs) are generally comprised of magnetic metals or ferrite nanocrystalline particles dispersed in a polymer matrix, and always have a high thickness and heavy weight.…”

Section: Introductionmentioning

confidence: 99%

Wideband Absorption at Low Microwave Frequencies Assisted by Magnetic Squeezing in Metamaterials

Wang

Han

et al. 2020

Front. Phys.

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In this paper, the magnetic squeezing effect in metamaterials is explored and applied to achieve wideband absorption in low-frequency microwave bands. To this end, a metamaterial absorber (MA) is proposed, which consists of a square lattice of a split ring resonator (SRR) placed on top of a magnetic absorbing material (MAM) layer backed by a conducting ground. In the positive resonance region of SRRs, a strong magnetic squeezing effect occurs and more concentrated magnetic field lines are confined within SRRs. This results in significant magnetic field enhancement within the MAM layer, which provides a prerequisite for high-efficiency absorption enhancement at low frequencies. To verify this method, we fabricated a prototype using a 3.0 mm thick silicone MAM sheet. Both the simulation and experiment results show that with the assistance of magnetic squeezing in the SRR array, the absorption at lower frequencies is significantly enhanced and is above 90% in 1.25–2.31 GHz under normal incidence. Furthermore, the MA exhibits satisfactory stability for different polarization states and incident angles due to the square lattice of the SRR array. This design method may find potential applications in fields such as electromagnetic compatibility, wireless communication, and others.

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Ultrathin microwave metamaterial absorber utilizing embedded resistors

Cited by 66 publications

References 23 publications

An Absorptive Frequency Selective Reflector With Wide Reflection Band

An Absorptive Frequency Selective Reflector With Wide Reflection Band

Multiple Diffuse Coding Metasurface of Independent Polarization for RCS Reduction

Wideband Absorption at Low Microwave Frequencies Assisted by Magnetic Squeezing in Metamaterials

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