A Multifunctional Metamaterial-Based Dual-Band Isotropic Frequency-Selective Surface

Khan, Safiullah; Eibert, Thomas F.

doi:10.1109/tap.2018.2835667

Cited by 44 publications

(16 citation statements)

References 35 publications

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“…This device structure exhibits a resonant tuning range of 0.45 THz with a high Q ‐factor of 50 under a deformation quantity of 60 µm along a 1D direction. These results are better than those reported in the literature . Furthermore, the proposed device exhibits the multifunctionalities of a large tunability and p‐/s‐polarization switching, i.e., transverse magnetic (TM)/transverse electric (TE) switching.…”

mentioning

confidence: 58%

“…It can be observed that the trend of the Q ‐factor at ω 1 shows a linear increase with a maximum value of 50. The abovementioned electromagnetic performance is better than that obtained for other THz‐metamaterial devices reported in the literature . This result can be explained by the field distributions for the PSM in the TE and TM modes, as shown in Figure c.…”

mentioning

confidence: 61%

“…In this study, an active tuning approach for a THz metamaterial with an ultranarrow bandwidth is presented. The proposed device exhibits a larger scalability, higher polarization dependence, and larger tuning range compared to devices reported in the literature . Owing to the low stiffness with large proof mass of the PDMS‐based metamaterial, one can generate a large deformation by applying a small strain force.…”

mentioning

confidence: 99%

“…Among these approaches, a reconfigurable metamaterial becomes feasible in the active manipulation of THz wave applications. This manipulation can be achieved by reconfiguring the geometrical dimension of a metamaterial, reforming the structure, and bending the substrate or lattice . The geometrical variations of the metamaterial are mostly generated from the mechanical movement or deformation within metamaterial structures .…”

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confidence: 99%

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A Stretchable Terahertz Parabolic‐Shaped Metamaterial

Lin

2019

Advanced Optical Materials

100

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A stretchable parabolic‐shaped metamaterial (PSM) coated onto polydimethylsiloxane (PDMS) is proposed and demonstrated for operation in the terahertz (THz) frequency range. By stretching the PDMS‐based PSM device along different directions, ultranarrowband, polarization dependent, switchable optical characteristics are obtained. By stretching the PSM width and length in the transverse electric (TE) and transverse magnetic (TM) modes, resonant tuning ranges of 0.55 and 0.32 THz, respectively, are demonstrated for the PSM device. In these deformation ranges, the Q‐factors of the PSM device for different widths and lengths are quite stable and maintained in the range of 9 to 14 for the TE mode, with a high Q‐factor of 50 obtained at resonance for the TM mode. The integration of the PSM on a mechanically deformable PDMS substrate provides potential for use in flexible electronics applications. Furthermore, the PSM device exhibits single‐/dual‐band switching and polarization switching characteristics. These multifunctional states for the PSM device can be determined by mechanical inputs to represent binary digits that can then be used to perform logic operations. Such a stretchable PSM device offers an effective approach for the realization of programmable metamaterials with enhanced optical‐mechanical performance due to its high flexibility, applicability, and cost‐effectiveness.

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confidence: 58%

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confidence: 61%

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confidence: 99%

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confidence: 99%

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A Stretchable Terahertz Parabolic‐Shaped Metamaterial

Lin

2019

Advanced Optical Materials

100

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“…Particle swarm optimisation (PSO) is an evolutionary algorithm with fast search speed and high execution efficiency [12]. Multi-objective PSO (MOPSO) algorithm is an improved PSO, which can accomplish the simultaneous optimisation of multiple objective functions with high search accuracy and low complexity [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Design of dual‐band wide‐angle RF/IR beam combiner based on impedance matching

Hao

Wang

et al. 2019

IET Microwaves, Antennas & Propagation

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A radiofrequency (RF)/infrared (IR) beam combiner is used to combine IR signals and RF signals into a common transmission axis. In this study, a dual‐band wide‐angle RF/IR beam combiner with high RF transmission and IR reflection was proposed. Based on the impedance matching principle, the RF/IR beam combiner consisted of a high reflective IR film, an IR substrate, and two RF matching layers. Multi‐objective particle swarm algorithm was applied to optimise the relative permittivity and the thicknesses of the IR substrate and the RF matching layers. A higher than 75% RF transmittance was obtained in both 8–12 GHz and 34–36 GHz bands when the RF incident angle was varied from 30° to 62°. At the same time, the reflectance in 8–12 μm was as high as 96%. It could be used in the hardware‐in‐the‐loop simulation systems to test and evaluate the detecting and tracing performances of the RF/IR dual‐mode guidance devices.

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Entirely Biodegradable Wireless pH Sensor with Split‐Ring Resonators for Soil pH Monitoring

Sakabe,

Kan,

Onoe

2024

Adv Materials Technologies

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This paper describes a wireless and battery‐free soil pH sensor made entirely of degradable materials. Soil pH monitoring is significant for precision agriculture and environmental conservation because soil health can be estimated by measuring soil pH. Soil pH can be measured by collecting soil samples and analyzing them in a laboratory environment or by inserting an electrode‐type sensor into the soil and measuring soil pH on site. However, neither method is suitable for wide‐area soil pH sensing for precision agriculture or environmental conservation. Herein, a fully biodegradable wireless pH sensor is presented that can be dispersed to outdoor environment to detect soil acidity. The sensor is operated wirelessly through split‐ring resonators (SRRs) that consist of patterned octacalcium phosphate (OCP)‐coated magnesium (Mg) on a poly‐lactic acid (PLA) sheet. At acidic soil pH, the degradation of each SRR results in a change in the electromagnetic response of the sensor. The operation of the sensor in six different types of acidic soils is demonstrated to distinguish the acidic soil wirelessly. It is expected that the biodegradable sensor can be applied to low‐cost, easy‐to‐use, and environmentally friendly monitoring of soil pH.

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A Multifunctional Metamaterial-Based Dual-Band Isotropic Frequency-Selective Surface

Cited by 44 publications

References 35 publications

A Stretchable Terahertz Parabolic‐Shaped Metamaterial

A Stretchable Terahertz Parabolic‐Shaped Metamaterial

Design of dual‐band wide‐angle RF/IR beam combiner based on impedance matching

Entirely Biodegradable Wireless pH Sensor with Split‐Ring Resonators for Soil pH Monitoring

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