Design of Biodegradable Quadruple-shaped DRA for WLAN/Wi-Max applications

Kumar, Pramod; Dwari, Santanu; Kumar, Utkarsh; Kumar, Jitendra

doi:10.1590/2179-10742017v16i31019

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…A recent example concerning the adoption of fused deposition modeling (FDM) to fabricate DRAs having different shapes was proposed in [19], [20], [12]. Specifically, rectangular, spherical, triangular [19], and 3D quadrupole-shaped DRAs for WI-LAN and 5G communications were manufactured by means of poly lactic acid (PLA), a biodegradable thermoplastic featuring ε r = 3.48 and negligible loss tangent [20], [12]. Additionally, in [12], the same 3D quadrupole shaped geometry was also fabricated by means of SLA, considering photopolymer resin as material.…”

Section: Introductionmentioning

confidence: 99%

Design and Manufacturing of Super-Shaped Dielectric Resonator Antennas for 5G Applications Using Stereolithography

et al. 2020

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In this work, the inverted micro-Stereolithography (SLA) is used to show the potential of such additive manufacturing (AM) technology at prototyping super-shaped dielectric resonator antennas (S-DRAs) rapidly and accurately. The S-DRAs, which exhibit 3D complex geometries, were designed to operate at 3.5 GHz, suitable for the assessment of 5G communications in the mid band. Initially, a cross-starred-shaped S-DRA was designed and manufactured via the inverted micro-SLA by means of a photopolymer resin as material. As no information about the used material was available from literature and supplier, the dielectric properties of the photopolymer resin were characterized. Moreover, in the view of challenging further the SLA capability, several prototypes, based on the cross star shaped geometry but exhibiting a twist of variable angles along the longitudinal axis, were fabricated and tested. In order to compare the antennas performance in relation to the material volume and sizes, rectangular and cylindrical DRAs were also realized using same material and technology. Scattering parameter S 11 , gain, bandwidth (BW), efficiency and co-and cross-polarization of all antennas were measured. The experimental results showed that twisted S-DRAs exhibit same performance of the basic cross-starred-shaped antenna, due to the invariance to symmetry of the basic Gielis geometry. The measured gain is about 2.5 dB over a range of 1 GHz in the frequency range of interest; the BW measured for all S-DRAs is about 10%, whereas the efficiency is about 80% at 3.5 GHz. Finally, better performance in terms of bandwidth is shown by the S-DRAs, considering their dramatic volume reduction (∼85%) compared to classic rectangular and cylindrical DRAs and other DRA examples already reported in the state of the art.

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Section: Introductionmentioning

confidence: 99%

Design and Manufacturing of Super-Shaped Dielectric Resonator Antennas for 5G Applications Using Stereolithography

et al. 2020

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“…With respect to the gain of the antennas proposed, we obtained results similar to those of Guimarães et al, however, we used a holes distribution rectangular mesh, simpler than the hexagonal symmetry used by them. To compare also with printed antennas, the work of Kumar and Dwari presented a dielectric resonator antenna (DRA) printed in biodegradable material for WLAN/Wi‐Max, but it obtained a gain of 4.5 dB, inferior to our antenna of quadratic holes.…”

Section: Resultsmentioning

confidence: 91%

Frequency invariance, gain improvement, and fast design in 3D‐printed photonic band gap antennas with quadratic holes

Andrade

Mendonca

2019

Micro & Optical Tech Letters

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The use of photonic band gap (PBG) substrates with noncylindrical holes in microstrip antennas is little reported in the literature. In this article, a 3D printer was used to produce two PBG antennas in acrylonitrile‐butadiene‐styrene (ABS) substrate: one with cylindrical holes and the other with quadratic prism holes, both with the same volume in the holes and in the total composition. The proposed PBG antenna with quadratic prism holes maintains the same resonance frequency of antenna with cylindrical holes, that is, 2.64 GHz. In addition, the proposed antenna greatly reduces the project time in the simulation phase, which is very onerous in conventional PBG antennas. The PBG antennas improved the distribution of surface current and increased the gain in relation to the antenna without PBG. Thus, the obtained results were as follows: the gain and efficiency of radiation were 3.75 dB and 55% for the antenna without PBG, 4.5 dB and 60% for the antenna with cylindrical holes, and 5 dB and 62% for the antenna with quadratic holes. All antennas maintained an approximate bandwidth of 3%. These antennas were built, simulated, and measured. A schematic of the build structures, return loss, Smith's chart, radiation diagrams, and computational simulation time was analyzed throughout this article.

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“…As a matter of fact, several dielectric materials are suitable for use in AM technologies, although few of them have actually been evaluated and characterized in the microwave range. Among polymers, the thermoplastic Poly-Lactic Acid (PLA) [ 23 , 24 , 25 ] and, more recently, photopolymer resins [ 26 ], have been analyzed, characterized, and utilized.…”

Section: Introductionmentioning

confidence: 99%

Rapid Prototyping of Bio-Inspired Dielectric Resonator Antennas for Sub-6 GHz Applications

et al. 2021

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Bio-inspired Dielectric Resonator Antennas (DRAs) are engaging more and more attention from the scientific community due to their exceptional wideband characteristic, which is especially desirable for the implementation of 5G communications. Nonetheless, since these antennas exhibit peculiar geometries in their micro-features, high dimensional accuracy must be accomplished via the selection of the most suitable fabrication process. In this study, the challenges to the manufacturing process presented by the wideband Spiral shell Dielectric Resonator Antenna (SsDRA), based on the Gielis superformula, are addressed. Three prototypes, made of three different photopolymer resins, were manufactured by bottom-up micro-Stereolithography (SLA). This process allows to cope with SsDRA’s fabrication criticalities, especially concerning the wavy features characterizing the thin spiral surface and the micro-features located in close proximity to the spiral origin. The assembly of the SsDRAs with a ground plane and feed probe was also accurately managed in order to guarantee reliable and repeatable measurements. The scattering parameter S11 trends were then measured by means of a Vector Network Analyzer, while the realized gains and 3D radiation diagrams were measured in the anechoic chamber. The experimental results show that all SsDRAs display relevant wideband behavior of 2 GHz at −10 dB in the sub-6 GHz range.

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Design of Biodegradable Quadruple-shaped DRA for WLAN/Wi-Max applications

Cited by 14 publications

References 18 publications

Design and Manufacturing of Super-Shaped Dielectric Resonator Antennas for 5G Applications Using Stereolithography

Design and Manufacturing of Super-Shaped Dielectric Resonator Antennas for 5G Applications Using Stereolithography

Frequency invariance, gain improvement, and fast design in 3D‐printed photonic band gap antennas with quadratic holes

Rapid Prototyping of Bio-Inspired Dielectric Resonator Antennas for Sub-6 GHz Applications

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