Design and Fabrication of a Band-Pass Filter With EBG Single-Ridge Waveguide Using Additive Manufacturing Techniques

García-Martínez, Héctor; Ávila-Navarro, Ernesto; Torregrosa‐Penalva, Germán; Delmonte, Nicolò; Silvestri, Lorenzo; Marconi, Stefania; Alaimo, Gianluca; Auricchio, Ferdinando; Bozzi, Maurizio

doi:10.1109/tmtt.2020.3006836

Cited by 18 publications

(12 citation statements)

References 21 publications

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“…An increase in the temperature of the filter causes a change in the refractive index of the film. The substrate and the film have different coefficients of thermal expansion; hence, when heated, the film is elastically deformed under the action of substrate stress, resulting in a change in the concentration density and a shift in the center wavelength [ 24 ]. If the center wavelength shift due to thermal expansion is too large, the prediction performance of the model will be greatly reduced.…”

Section: Methodsmentioning

confidence: 99%

Water and nitrogen in-situ imaging detection in live corn leaves using near-infrared camera and interference filter

Zhang

Liu

et al. 2021

Plant Methods

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Background Realizing imaging detection of water and nitrogen content in different regions of plant leaves in-site and real-time can provide an efficient new technology for determining crop drought resistance and nutrient regulation mechanisms, or for use in precision agriculture. Near-infrared imaging is the preferred technology for in-situ real-time detection owing to its non-destructive nature; moreover, it provides rich information. However, the use of hyperspectral imaging technology is limited as it is difficult to use it in field because of its high weight and power. Results We developed a smart imaging device using a near-infrared camera and an interference filter; it has a low weight, requires low power, and has a multi-wavelength resolution. The characteristic wavelengths of the filter that realize leaf moisture measurement are 1150 and 1400 nm, respectively, the characteristic wavelength of the filter that realizes nitrogen measurement is 1500 nm, and all filter bandwidths are 25 nm. The prediction result of the average leaf water content model obtained with the device was R2 = 0.930, RMSE = 1.030%; the prediction result of the average nitrogen content model was R2 = 0.750, RMSE = 0.263 g. Conclusions Using the average water and nitrogen content model, an image of distribution of water and nitrogen in different areas of corn leaf was obtained, and its distribution characteristics were consistent with the actual leaf conditions. The experimental materials used in this research were fresh leaves in the field, and the test was completed indoors. Further verification of applying the device and model to the field is underway.

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Section: Methodsmentioning

confidence: 99%

Water and nitrogen in-situ imaging detection in live corn leaves using near-infrared camera and interference filter

Zhang

Liu

et al. 2021

Plant Methods

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“…Recently, some articles have been published on periodic structures in Substrate Integrated Waveguide (SIW) [25], [26] and in rectangular waveguide devices [27] or Single-Ridge Waveguide (SRW) [28]. The main drawbacks in these works are the high return losses that occur when using this type of structure and the attenuation caused by the presence of the dielectric.…”

Section: Introductionmentioning

confidence: 99%

3D-Printed Electromagnetic Band-Gap Band-Pass Filter Based on Empty Single-Ridge Waveguide

et al. 2022

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“…Artificial electromagnetic band-gap (EBG) structures are typically created using two-or three-dimensional periodic metallic and dielectric structures [1][2][3]. They have attracted significant research interest in recent years due to their special electromagnetic properties, which are applicable in a wide range of electromagnetic devices [4,5]. Metallic parallel-plate waveguides (PPWGs) [1,5] and glidesymmetric unit cells [6][7][8] are considered of the illustrious EBG periodic structures.…”

Section: Introductionmentioning

confidence: 99%

“…When the periodicity (p) is small compared to the operating wavelength, the operation mechanism of this EBG structure can be explained using an effective medium of oneunit cell [2]. The unit cells are selected to include the most families of the well-known recently studied cells used for EBG structures [1][2][3][4][5][6][7][8]. They cover the parallel plate waveguides with one and two pins (cells A and B), the holey and holey glide-symmetric unit cells (cells C and D), and nonparallel plate cells (cell E).…”

Section: Introductionmentioning

confidence: 99%

Accurate Characterization of Electromagnetic Band-Gap Structures

Aladadi

Alkanhal

2021

IEEE Access

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In this paper, electromagnetic band-gap (EBG) structures are accurately characterized using a freespace method. The field transmission and reflection parameters are exploited to determine the effective material parameters both inside and outside the band-gap regions of the EBG structures. The electromagnetic (EM) properties of the effective refractive index, effective wave impedance, effective permittivity, and effective permeability at multiple band-gap regions are derived from a single scattering computation. The derived phase and attenuation constants correctly define the boundaries of the band-gap region and the level of attenuation within the band gap. Deviations in the incidence angle from the normal direction alter the EM properties; hence, the operating bandwidth of the band-gap region is as expected due to the inherent structure anisotropy of the unit cells.INDEX TERMS EBG structure, band-gap region, metallic unit cells, characterization, dispersion diagram.

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Design and Fabrication of a Band-Pass Filter With EBG Single-Ridge Waveguide Using Additive Manufacturing Techniques

Cited by 18 publications

References 21 publications

Water and nitrogen in-situ imaging detection in live corn leaves using near-infrared camera and interference filter

Water and nitrogen in-situ imaging detection in live corn leaves using near-infrared camera and interference filter

3D-Printed Electromagnetic Band-Gap Band-Pass Filter Based on Empty Single-Ridge Waveguide

Accurate Characterization of Electromagnetic Band-Gap Structures

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