Design of a Novel 2.5D Frequency Selective Surface Element Using Fibonacci Spiral for Radome Application

Varikuntla, Krushna Kanth; Raghavan, S.

doi:10.23919/apmc.2018.8617334

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…In the second structure, metal connections are linked on both sides of a substrate to link together split rings of metal. These two different structures show efficient improvements in Ma et al 12 By combining two reduced‐size FSS elements using FSS techniques also reported in Kanth and Singaravelu 13 and Take et al 14 For X‐band applications, the size of the FSS was reduced by using a complicated pattern and a structure with two metal layers based on 2.5D resonators 15 . The literature shows that there were very few 2.5D implementations in the aspect of compactness.…”

Section: Introductionmentioning

confidence: 91%

Design of miniaturized 2.5D frequency selective surface for X‐ and Ku‐band applications

Suganya,

Natarajan

2024

Micro & Optical Tech Letters

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This paper presents the design of 2.5D frequency selective surface (FSS) for X and Ku band applications. Proposed FSS's unit cell is constructed with two independent slitted rings on both side of the FR4 substrate and is connected with metallic vias. The FSS offers a wide stop band performance from 6.26 to 18 GHz, with a fractional bandwidth of 96.7% measured at S21 < −10 dB and has a low insertion loss (IL) of 0.018 dB. The footprint of the FSS is only about 0.11 with the shielding effectiveness of 83.365 dB, and the transverse electric and transverse magnetic mode performances are stable up to 70 degrees. Prototype FSS is fabricated and measured for its performance validation. The performance validation is carried out using applied wave research and the equivalent circuit model tools.

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Section: Introductionmentioning

confidence: 91%

Design of miniaturized 2.5D frequency selective surface for X‐ and Ku‐band applications

Suganya,

Natarajan

2024

Micro & Optical Tech Letters

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“…In Figure 1, the main basic FSS types are presented. Modern advanced FSS structures can be much more complicated, as in [12,13]. FSSs with required spectral characteristics can be integrated with superconducting detectors, as in [14], and develop receivers for several frequency bands.…”

Section: Frequency-selective Surfacesmentioning

confidence: 99%

Arrays of Sub-Terahertz Cryogenic Metamaterial

et al. 2021

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Integrated quasi-optical cryogenic terahertz receivers contain arrays of detectors, quasi-optical filters, interferometers, and other metamaterials. Matrices of quasi-optical band-pass, low-pass, and high-pass filters, Fabry–Perot grid interferometers, and arrays of half-wave and electrically small antennas with superconductor-insulator-normal metal-insulator-superconductor (SINIS) sub-terahertz wavelength range detectors were fabricated and experimentally studied on the same computational, technological, and experimental platform. For the design of the filters, we used the periodic frequency-selective surfaces (FSS) approach, contrary to detector arrays that can be presented in a model of distributed absorbers. The structures were fabricated using direct electron beam lithography, thermal shadow evaporation, lift-off, alternatively magnetron sputtering, and chemical and plasma etching. The numerical simulation methods of such structures are sufficiently different: for the reactive matrices with low losses, the approximation of an infinite structure with periodic boundary conditions is applicable, and for the arrays of detectors with dissipative elements of absorbers, a complete analysis of the finite structure with hundreds of interacting ports is applicable. The difference is determined by the presence of dissipation in the detector arrays, the phase of the reflected or re-emitted signal turned out to be undefined and the Floquet periodic boundary conditions are correct only for a phased array antenna. The spectral characteristics of the created filters, interferometers, and antenna arrays were measured in the frequency range 50–600 GHz.

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“…Indeed, spiral and Fibonacci-based shapes have been frequently exploited in the antenna scenario to tailor planar and metal-based antenna performance. Fibonacci spirals were used for FSS implementation in microwave absorbers [ 30 ] and radome applications [ 31 ], or applied to modified Koch curves for antenna miniaturization [ 32 ]. Furthermore, Logarithmic spiral slots have been used for the implementation of cylindrical DRA multimode operations [ 33 ].…”

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 a Novel 2.5D Frequency Selective Surface Element Using Fibonacci Spiral for Radome Application

Cited by 6 publications

References 7 publications

Design of miniaturized 2.5D frequency selective surface for X‐ and Ku‐band applications

Design of miniaturized 2.5D frequency selective surface for X‐ and Ku‐band applications

Arrays of Sub-Terahertz Cryogenic Metamaterial

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

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