Magnetically Tunable Wideband Ferrite-Based Metamaterial Phase Shifter

Yao, Huiming; Wang, Shihong; Lei, Ming; Ke, Bi

doi:10.30919/es8d549

Cited by 3 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of their spinel structure, ferrites are a prominent filler material used by scientists for improving the electrical features of pure polymers 20 . It has been proven that ferrite nanoparticles (NPs) may be used as nanocatalysts for biodiesel production, tunable phase shifters, and anisotropy in soft magnetic applications 21–23 …”

Section: Introductionmentioning

confidence: 99%

“…20 It has been proven that ferrite nanoparticles (NPs) may be used as nanocatalysts for biodiesel production, tunable phase shifters, and anisotropy in soft magnetic applications. [21][22][23] Numerous studies on the creation, characterization, and properties of polymer-ferrite NP are described in the literature. 24,25 PANI is one of the most useful conducting polymers, because of its high absorption coefficients in visible light, intriguing redox properties, less density than metallic substances, energy storage, ease of synthesis, relatively excellent conductivity, ecologically stable compound, cheapness, beneficial optical and electrical characteristics, and ability to be reversibly converted from conduction to insulation through the use of acid-base reactions or electrochemical or chemical doping.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

PANI/Zn‐Cu ferrite polymer composites as free‐standing high dielectric materials

Kumar,

Paul Raj,

Muthukrishnan

et al. 2024

Polymers for Advanced Techs

View full text Add to dashboard Cite

In a wide range of applications, from consumer electronics to cutting‐edge industrial and scientific equipment, high dielectric permittivity (ε′) polymers are crucial for maximizing the performance and efficiency of electrical and electronic systems. Researchers strive to create and perfect these materials to meet the changing demands of modern technology. It is generally known that freestanding bare polymers cannot achieve high dielectric values; however, the mixing of multiple materials that are distinct is an effective technique for developing high dielectric hybrids. Polymer‐based nanoarchitectures are particularly beneficial for use in the storage of energy due to characteristics such as excellent mechanical strength, noncorrosive nature, lightweight, affordability, versatility, thermal and electrical shielding. The primary aim of this investigation is to prepare copper ferrite, zinc ferrite, and copper0.5 zinc0.5 ferrite (CuFe2O4, ZnFe2O4, and Cu0.5Zn0.5Fe2O4) nanoparticle (NP) via combustion technique using egg albumen as a fuel and these NPs were separately dispersed in polyaniline (PANI) matrix by the method of ex situ polymerization of aniline with an objective to enhance the electrical properties for energy storage and electromagnetic wave applications. Flexible freestanding films were casted via solution casting technique. X‐ray diffractogram of 5 wt.% NP dispersed PANI films confirmed the presence of NPs in the PANI matrix. Scanning electron micrograph images show the homogeneous dispersion of NPs into PANI matrix. Rather than the pure ferrite NPs, mixed ferrite highly enhance the permittivity of PANI films without much increasing its loss factor, the obtained values of ε′ of all the three ferrite added films are higher than polyvinylidene fluoride (PVDF)/(Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 nanofiller. In this work notably for 5 wt.% Cu0.5Zn0.5Fe2O4 dispersed film shows the highest value of ε′ (7291) for 100 Hz at 150°C with ultralow loss factor (0.08) which is the key characteristic of an energy storage material. Thus, this present study leads the formation of a cost effective, flexible, high dielectric material, which can be a potential alternate to replace PVDF/(Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 and polyvinyl alcohol/Ni0.65Cu0.35Fe2O4 polymer blends for energy storage applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PANI/Zn‐Cu ferrite polymer composites as free‐standing high dielectric materials

Kumar,

Paul Raj,

Muthukrishnan

et al. 2024

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…Metamaterials with a feature of negative permittivity or permeability attract a lot of attention due to their applications in the field of invisible cloaking, 1,2 imaging based on perfect lens, [3][4][5] absorpers, [6][7][8] frequency selective surfaces, [9][10][11] wireless communication devices 12 and so on. 13,14 The negative permittivity in metamaterials was usually realised by 2D metallic periodical structures, such as split ring resonators (SRRs) 15,16 and L shape arrays. 17 Apart from the artificial structures, negative permittivity could actually be realised in "real" 3D isotropic materials based on the same principle of plasma oscillation resonances.…”

mentioning

confidence: 99%

Tuning Negative Permittivity by Anodization of A 3D Copper Network

Hou¹,

Ju²,

Qin³

et al. 2022

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

Negative permittivity is a required physical property of metamaterials which has been widely used in some emerging and unconventional applications, such as cloaking, perfect lens and perfect wave absorption. In addition to periodic meta-structured units, a composite with conductive networks, so-called metacomposite, is equivalent to diluted metals, which also exhibits negative permittivity properties at microwave frequency. The percolative metacomposites have the advantages of isotropic property, flexible preparation methods and low cost in achieving negative permittivity. However, building a percolation network from conductive fillers in an insulating matrix is a complicated process, and the dispersion of fillers is difficult to control. In this study, the percolation network was modulated on the basis of the conductive copper foam by anodization treatment. The conductivity and negative permittivity of the foam varied with the anodization time. As the anodization time increased, the foam changed from a typical Drude metal to a less conductive 3D structure with mitigated negative permittivity. The absolute value of the negative permittivity of Cu-30V-5h sample was two orders of magnitude lower than that of the samples anodised for 30V-3h, 20V-3h and 20V-1h. Therefore,anodization is a facile and effective method to control the conductivity and negative permittivity of copper epoxy metacomposites.

show abstract

An ultra-thin ultra-broadband microwave absorber for radar stealth

Hao

Jing

et al. 2022

Adv Compos Hybrid Mater

View full text Add to dashboard Cite

Magnetically Tunable Wideband Ferrite-Based Metamaterial Phase Shifter

Cited by 3 publications

References 25 publications

PANI/Zn‐Cu ferrite polymer composites as free‐standing high dielectric materials

PANI/Zn‐Cu ferrite polymer composites as free‐standing high dielectric materials

Tuning Negative Permittivity by Anodization of A 3D Copper Network

An ultra-thin ultra-broadband microwave absorber for radar stealth

Contact Info

Product

Resources

About