Increasing the Directivity of Resonant Cavity Antennas with Nearfield Transformation Meta-Structure Realized with Stereolithograpy

Shrestha, Sujan; Zahra, Hijab; Abbasi, Muhammad Ali Babar; Asadnia, Mohsen; Abbas, Syed Muzahir

doi:10.3390/electronics10030333

Cited by 12 publications

(5 citation statements)

References 28 publications

(32 reference statements)

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“…Recently, the application of these technologies has been extended to the fabrication of metamaterials and metasurfaces, which are capable to modify the propagation of electromagnetic waves. These structures can be used to improve beam directivity, generate Gaussian and Bessel beams, increase antenna gain, and improve signal-to-noise ratio [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Instrument for Multidimensional Characterization of Advanced Wireless Communication Technologies

et al. 2023

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Exploring the potential of 3D printing in electromagnetic wave manipulation, this paper introduces a novel, cost-effective instrument for microwave metasurface characterization. Metasurfaces, designed to alter wave propagation, are promising tools for enhancing antenna efficiency in advanced telecommunication methods, such as 5G systems. However, their complex profile characterization often poses significant challenges. Our proposed fully automated four-axis instrument, leveraging 3D printing capable of creating complex structures (such as metasurfaces), addresses these challenges by offering an efficient and precise solution. The instrument, costing approximately USD 1550, successfully characterized a metalens designed for modulating 30 GHz signals with a 20 cm focal distance, proving its utility. The 2D and 3D intensity distribution profiles and key parameters (including 8.05 dB gain, 11 cm 3 dB depth of focus, and 2.17 cm full width at half maximum) were extracted. Our measurements notably corresponded with the theoretical diffraction calculations, validating the instrument’s efficacy. This breakthrough significantly contributes to microwave metasurface characterization techniques which are vital for future millimeter-wave communication systems.

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Section: Introductionmentioning

confidence: 99%

A Low-Cost Instrument for Multidimensional Characterization of Advanced Wireless Communication Technologies

et al. 2023

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“…In order to have a low profile, a light weight and the use of fewer 3D printed materials with a lower side lobe level, a cube structure was considered, as in [ 18 ], to show a reduced side lobe level, whereas in [ 19 ] the considered structure was able to maintain phase correction for about

. The advancement in additive manufacturing technologies is growing in significance in the field of electromagnetic wave propagation; these were studied in [ 20 , 21 , 22 , 23 , 24 ]. Considering this aspect, the novelty of this manuscript was in proposing a simple, low profile, easily realizable geometrical structure that will be able to have a more uniform phase distribution, which can be further analyzed to study the deviation of the radiated beam direction.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Feed Source through Three Dimensional Printing

2023

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The three-dimensional printed wideband prototype (WBP) was proposed, which is able to enhance the horn feed source by generating a more uniform phase distribution that is obtained after correcting aperture phase values. The noted phase variation obtained without the WBP was 163.65∘ for the horn source only, which was decreased to 19.68∘, obtained after the placement of the WBP at a λ/2 distance above the feed horn aperture. The corrected phase value was observed at 6.25 mm (0.25λ) above the top face of the WBP. The use of a five-layer cubic structure is able to generate the proposed WBP with dimensions of 105 mm × 105 mm × 37.5 mm (4.2λ× 4.2λ× 1.5λ), which can improve directivity and gain by 2.5 dB throughout the operating frequency range with a lower side lobe level. The overall dimension of the 3D printed horn was 98.5 mm × 75.6 mm × 192.6 mm (3.94λ× 3.02λ× 7.71λ), where the 100 % infill value was maintained. The horn was painted with a double layer of copper throughout its surface. In a design frequency of 12 GHz, the computed directivity, gain, side lobe level in H- and E- planes were 20.5 dB, 20.5 dB, −26.5 dB, and −12.4 dB with only a 3D printed horn case and, with the proposed prototype placed above this feed source, these values improved to 22.1 dB, 21.9 dB, −15.5 dB, and −17.5 dB, respectively. The realized WBP was 294 g and the overall system was 448 g in weight, which signifies a light weight condition. The measured return loss values were less than 2, which supports that the WBP has matching behavior over the operating frequency range.

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“…Additionally, the broadband response was achieved through the use of alternative dielectric layers with both low- and high-permittivity materials, which were implemented through plastic filaments realized by Fused Deposition Modeling (FDM) and with ceramic material such as alumina, respectively [ 24 ]. The 3D-printed antenna showed effective performance in increasing the performance of the feed source [ 25 , 26 ], as well as in the beam tilting phenomenon [ 27 ]. In light of employing a low-profile and low-cost 3D-printed antenna design that utilizes a single material, this article proposes a miniaturized metasurface antenna prototype that consists of non-uniform cuboids, which have a rectangular base as a support structure.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Wideband Antenna Prototype Operating over the Ku-Band

et al. 2022

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A wideband antenna is proposed based on three-dimensional printing technology. The antenna was designed using the PREPERM 10 material, with permittivity ϵr = 10, where the overall height of the proposed prototype was maintained as 12.83 mm (0.51λ), having a lateral dimension of 60 mm × 60 mm, at an operating frequency of 12 GHz (λ = 25 mm). The proposed antenna achieved a wide frequency bandwidth with a voltage standing-wave ratio (VSWR) of less than two, from 10 GHz to 15 GHz in the Ku-band, where the maximum directivity was 20 dBi over a reflection coefficient bandwidth of 50%. It showed a miniaturized non-uniform metasurface of 2.4λ× 2.4λ× 0.51λ that was placed at 16.5 mm (0.66λ) above the ground plane, which was 2.4λ× 2.4λ× 0.04λ in dimension. Thus, the overall height of the proposed antenna system from the feed source was 29.33 mm (1.17λ). The total weight of the system including the designed structures made of PREPERM 10 and ABS with copper-painted prototypes was 96 g and 79 g, respectively. The measured results were consistent with the simulated results, demonstrating the feasibility and effectiveness of the proposed method.

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Increasing the Directivity of Resonant Cavity Antennas with Nearfield Transformation Meta-Structure Realized with Stereolithograpy

Cited by 12 publications

References 28 publications

A Low-Cost Instrument for Multidimensional Characterization of Advanced Wireless Communication Technologies

A Low-Cost Instrument for Multidimensional Characterization of Advanced Wireless Communication Technologies

Enhancement of Feed Source through Three Dimensional Printing

Miniaturized Wideband Antenna Prototype Operating over the Ku-Band

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