A fractal metamaterial based printed dipoles on a nickel oxide polymer palm fiber substrate for Wi-Fi applications

Elwi, Taha A.; Ahmad, Bilal

doi:10.1016/j.aeue.2018.09.020

Cited by 26 publications

(30 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effects of T‐stub length on the unit cell performance are realized by changing the gap with respect to the fractal geometry from 0.05 to 0.15 mm with a step of 0.05 mm. A significant change is happened in the frequency resonance cause of the capacitive coupling change . The effect of the frequency tuning can be observed very well in the computed S parameter spectra in Figures A and B.…”

Section: T‐stub Gap Effectssupporting

confidence: 60%

“…The equivalent circuit of the proposed unit cell is seen in Figure B. The equivalent circuit is derived from a circuit model in Elwi and Ahmed . The proposed unit cell is decomposed to six branches including the fractal radiation structure with R F , G F , L F , and C F .…”

Section: Antenna and Mtm Structurementioning

confidence: 99%

“…Thus, the proposed EBG without MTM patch shows a cutoff frequency without renounce . Therefore, only the waves on the antenna patch would propagate with insignificant attenuation …”

Section: Mtm and Ebg Characterizationsmentioning

confidence: 99%

“…The simulated and measured antenna bore‐sight gain spectra are presented in Figure . The gain spectrum is measured using three antenna method . The maximum achieved gain value is found to be 8 dBi at 17.5 GHz.…”

Section: Antenna Performancementioning

confidence: 99%

“…While in Elwi, MTM inclusions were conducted to reduce the effects of absorbed energy by human tissues from portable devices. Later, nano‐scale structures are conducted as another frontier to realize the ability of printing novel antenna circuities for different modern wireless applications In Elwi and Ahmed, the use of nanoparticle conductive ink to fabricate microstrip antennas was convinced. Then, the fabrication of more complicated printed circuit antenna design‐based MTMs were realized in Elwi and Yang et al A flexible radio‐frequency identification (RFID)‐based wireless gas sensor was conducted to carbon nanotube films as one chip fashion in .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Novel miniaturized folded UWB microstrip antenna‐based metamaterial for RF energy harvesting

Elwi

Jassim

Mohammed

2020

Int J Communication

Self Cite

View full text Add to dashboard Cite

Summary This paper presents a design of an ultra‐wideband (UWB) cylindrical metamaterial (MTM) antenna for radio frequency (RF) energy harvesting to suit the fields of Internet of Things (IoT) applications. The patch circuitry is based on 3×5 Hilbert‐shaped MTM unit cells array to enhance the antenna bandwidth. While, the antenna ground plane is defected with an electromagnetic band gap structure to enhance the gain. The antenna is mounted on a polytetrafluoroethylene cylindrical substrate of an outer diameter of 15 mm and length of 32 mm with 1 mm in thickness. The substrate relative permittivity is 2.04, and the loss tangent is 0.0002. The antenna patch and the ground plane structures are printed with silver nanoparticles ink using a 2.5D CNC plotter machine. The fabricated prototype provides an UWB over the frequency range from 3.77 up to 13.89 GHz with a first separate resonant mode at 3 GHz. The antenna performance is tested numerically using two different software packages of CST MWS and HFSS. Then, an experimental validation is conducted to realize the performance of the proposed antenna in harvesting the RF energy. Excellent conversion efficiency, about 90%, is achieved at 5.8 GHz. Finally, the antenna radiation patterns and S11 spectrum are measured and compared against their simulated results to achieve good agreements.

show abstract

Section: T‐stub Gap Effectssupporting

confidence: 60%

Section: Antenna and Mtm Structurementioning

confidence: 99%

“…Thus, the proposed EBG without MTM patch shows a cutoff frequency without renounce . Therefore, only the waves on the antenna patch would propagate with insignificant attenuation …”

Section: Mtm and Ebg Characterizationsmentioning

confidence: 99%

Section: Antenna Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Novel miniaturized folded UWB microstrip antenna‐based metamaterial for RF energy harvesting

Elwi

Jassim

Mohammed

2020

Int J Communication

Self Cite

View full text Add to dashboard Cite

show abstract

Ultra‐light fluorinated polyimide foams with excellent thermal insulation, low dielectric loss and high heat resistance

Jia,

Sun,

Zang

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

High efficiency thermal insulation materials are highly desirable in aerospace industry, whereas combining low density and low thermal conductivity of thermal insulation materials still remains a challenge. In this work, a series of fluorinated polyimide foams (PIFs) based on 4,4‐(hexafluoroisopropylidene) diphthalic anhydride (6FDA) were successfully prepared by microwave‐assisted powder foaming. The modification of fluorination decreased the melt strength while simultaneously enhanced the thermal properties of fluorinated PIFs through the high bonding energy of CF bond. Thus, fluorinated PIFs exhibited one of the lowest densities of reported PIFs, among them, the density of PIF6FDA‐DMBZ was as low as 9.34 kg m−3. The glass transition temperature of all fluorinated PIFs was greater than 295°C. Microwave‐assisted foaming optimized the cell structure effectively, resulting in the thermal conductivity of PIF6FDA‐ODA as low as 0.029 W m−1 K−1. The incorporation of hexafluoroisopropylidene groups reduced the polarization and enhanced the free volume of fluorinated PIFs, leading to hydrophobic characteristics (CA >105°) and ultra‐low dielectric loss properties (tan δ <0.001 at 20 GHz). PIF6FDA‐ODA demonstrated the most excellent comprehensive performance. The excellent comprehensive performance of fluorinated PIFs indicated their potential application as thermal insulation and wave‐transparent materials in aerospace, railway, and shipbuilding industries.

show abstract

A dual‐band circular patch antenna using hexagon‐shaped slots

Krishnan

Sankar²,

Ravi

et al. 2022

Int J Communication

View full text Add to dashboard Cite

Summary This paper presents the design of a dual‐band circular patch antenna for the application requirements of wireless handheld devices and various wireless sensor modules operating in WiMax and 5G NR Bands. The design originated from a single‐band conventional circular patch antenna and ended up with a dual‐band circular patch. A novel hexagon‐shaped slot was preferred to achieve dual‐band performance in the circular patch antenna. The simulation level performance of the antenna is verified using the Advanced Design System 2019 tool. An FR4 material with a height of 1.6 mm is selected as a substrate for the patch antennas. The return loss and radiation pattern behaviour of the patch antennas are measured using a network analyser and an anechoic chamber. The fabricated prototype achieves dual‐band performance at 3.47 and 6.96 GHz. Simulated and measured results show that the proposed hexagonal‐shaped slot in the circular patch provides a dual‐band behaviour.

show abstract

A fractal metamaterial based printed dipoles on a nickel oxide polymer palm fiber substrate for Wi-Fi applications

Cited by 26 publications

References 16 publications

Novel miniaturized folded UWB microstrip antenna‐based metamaterial for RF energy harvesting

Novel miniaturized folded UWB microstrip antenna‐based metamaterial for RF energy harvesting

Ultra‐light fluorinated polyimide foams with excellent thermal insulation, low dielectric loss and high heat resistance

A dual‐band circular patch antenna using hexagon‐shaped slots

Contact Info

Product

Resources

About