Reconfigurable wideband metamaterial absorber with wide angle and polarisation stability

Zhai, Huiqing; Zhan, Chuanhan; Liu, Lu; Zang, Yiping

doi:10.1049/el.2015.1557

Cited by 21 publications

(10 citation statements)

References 5 publications

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“…9. The waveguide measurement method [13,14] was used to test the absorption performance for its simplicity in measurement process. The proposed structure shows single absorption peak at 12.46 GHz for the lower height of 3.5 mm with double absorption peaks at 11.22 GHz and 15.54 GHz for higher gap of 7.5 mm.…”

Section: Resultsmentioning

confidence: 99%

Frequency Tunable Low Cost Microwave Absorber for Emi/Emc Application

Sen¹,

Das²

2018

PIER Letters

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A frequency tunable multi-layer low cost microwave absorber is proposed for Ku and X bands of applications. The tunability is obtained with the cavity model design using two metallic layers; a frequency selective surface (FSS) layer and a metal backed substrate layer with the air gap between them. The change in air-gap results in variation of the effective substrate height, and as a consequence the resonant frequency is tuned. The coupling of LC resonance and cavity resonance at an air-gap of 7.5 mm results in a dual-band absorption of the design. The proposed absorber performance has been analyzed for both TE and TM polarizations of incident wave, and the results are found to be same. The studies on surface current distribution and incident angle variation are observed to get physical insight behind absorption. The waveguide measurement method is used to correlate the simulated results with the measured one. With this simple cost-efficient design, the absorber appears well suited for microwave application at X and Ku bands.

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Section: Resultsmentioning

confidence: 99%

Frequency Tunable Low Cost Microwave Absorber for Emi/Emc Application

Sen¹,

Das²

2018

PIER Letters

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“…14, ensuring that the absorption rate of the proposed wide angle MMA is independent of polarization angle variation. The 0° incidence angle of TE mode excited incoming wave in waveguide method [14] has caused approximately 0.03 GHz-0.04 GHz shift in absorption frequency. This frequency shift is also aided by the fabrication mismatch tolerance and material parameter changes.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…Metamaterials (MTMs) are artificial materials whose electric and magnetic responses can be altered according to the required application to exhibit exotic properties not usually available in nature [1], [2]. Among several MTM based RF component applications like antennas [3][4][5], filters [6], [7] and high frequency photodiode bias Tee circuits [8], metamaterial absorbers (MMA) [9] are extensively proposed and investigated due to the various properties exhibited in the form of multi-band [10], polarization independence [11], compact [12], broad-band [13], [14], and wide-oblique angle [15], [16]. These exotic character-istics of MMAs are achieved merely by altering the geometrical parameters of the sub-wavelength unit cells which are usually arranged in a periodic manner.…”

Section: Introductionmentioning

confidence: 99%

“…The narrow bandwidth can be increased by increasing the substrate height or utilizing more intercoupled resonators with the enhanced electric and magnetic coupling level. To the extent of author's knowledge, no microwave MMA has been reported so far for the aforementioned frequency band and the proposed absorber is also tested for the polarization insensitivity using waveguide measurement technique [13][14][15]. This is mainly because of the necessity of eliminating large sample size (~10λ) requirement for the selected frequency band in case of free-space measurement system [8].…”

Section: Introductionmentioning

confidence: 99%

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Dual-Band Compact Metamaterial-Inspired Absorber with Wide Incidence Angle and Polarization Insensitivity for GSM and ISM Band Applications

Kaur¹,

Upadhyaya²,

Palandöken³

2018

RADIOENGINEERING

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A dual-band metamaterial inspired microwave absorber composed of concentric two crossed double-arrow shaped resonators, ring resonator with four splits at the corners and square ring resonator is presented. The proposed RF absorber has the absorption feature of wide incidence angle. The sub-wavelength unit cell of the proposed absorber is structured on a metal backed epoxy glass (FR-4) substrate. The novel absorber has two distinct absorption peaks of 99.4% and 98.6% at the frequencies of 1.94 GHz and 2.4 GHz, respectively. The designed structure is polarization-insensitive with wide incidence angle of 60 and high absorption rate of 82% for transverse electric and 98% for transverse magnetic modes. Polarization insensitivity of the proposed design is investigated by the waveguide measurement technique with setting different orientation angles for the unit cells. The measured and simulated results have good agreement making the proposed absorber a potential candidate for energy harvesting applications in GSM and ISM band.

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“…Sample-1 corresponds to the actual sample without any orientation whereas Sample-2 corresponds to the samples with 30 • inclination angle with respect to the Sample-1. These samples are tested using waveguide measurement technique [37][38][39] instead of free-space measurement system [13][14][15]. As the latter technique requires sample size in the order of 10λ, which results in comparatively large size samples of proposed absorber to be tested.…”

Section: Resultsmentioning

confidence: 99%

Dual-Band Polarization-Insensitive Metamaterial Inspired Microwave Absorber for Lte-Band Applications

Kaur¹,

Upadhyaya²,

Palandoken³

2017

PIER C

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Abstract-In this paper, the design, simulation and measurement of a dual-band polarizationinsensitive metamaterial inspired microwave absorber are presented. The unit cell is composed of two concentric closed ring resonator (CRR) structures forming octagonal rings which are carved on an FR-4 dielectric substrate to give maximum absorption at dual frequencies of 2.09 GHz and 2.54 GHz. At these frequencies, the minimum reflection coefficients of −29.15 dB and −18.76 dB are achieved with absorption rates of 99.88% and 98.67% and narrow 10 dB bandwidths of 2.62% and 2.76%, respectively. Microwave absorption property of the proposed absorber structure is simulated by setting the perfect electric boundary conditions in four planes whose surface normal vectors are directed perpendicular to the wave propagation direction. These numerical computation settings replicate the rectangular waveguide to be used in the experimental measurements for the comparison between the simulated and experimental results. It is experimentally verified by the waveguide measurement method that the absorption rates about 99% are achieved for dual bands with polarization insensitivity thereby meeting the absorption requirements of LTE-band frequencies for a real time microwave absorber based energy harvesting systems.

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Reconfigurable wideband metamaterial absorber with wide angle and polarisation stability

Cited by 21 publications

References 5 publications

Frequency Tunable Low Cost Microwave Absorber for Emi/Emc Application

Frequency Tunable Low Cost Microwave Absorber for Emi/Emc Application

Dual-Band Compact Metamaterial-Inspired Absorber with Wide Incidence Angle and Polarization Insensitivity for GSM and ISM Band Applications

Dual-Band Polarization-Insensitive Metamaterial Inspired Microwave Absorber for Lte-Band Applications

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