An Overview of Radomes for Large Ground-Based Antennas

MacDonald, Michael E.

doi:10.1109/maes.2019.2916537

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…The attenuations are to be considered when the radome thickness th (i.e., in the specialized literature, the radome thickens is abbreviated by the t symbol; however, to not be confused with time notation, this study will use th instead) is on the same scale with the communication wavelength λ. However, when th is much smaller than λ , the induced losses are sub-unitary [ 54 , 55 , 56 ]. In this study, the plastic lid thickness is 1 mm, while th represents the 2 cm distance of the Rx antenna to the lid; therefore, for the testing λ of 0.345 and 0.124 m, the lid-induced losses can be neglected since the weather during experiments was dry (i.e., without inducing water accumulations on the lid area).…”

Section: Methodsmentioning

confidence: 99%

Buried RF Sensors for Smart Road Infrastructure: Empirical Communication Range Testing, Propagation by Line of Sight, Diffraction and Reflection Model and Technology Comparison for 868 MHz–2.4 GHz

Marsic

Faramehr

Fleming

et al. 2023

Sensors

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Updating the road infrastructure requires the potential mass adoption of the road studs currently used in car detection, speed monitoring, and path marking. Road studs commonly include RF transceivers connecting the buried sensors to an offsite base station for centralized data management. Since traffic monitoring experiments through buried sensors are resource expensive and difficult, the literature detailing it is insufficient and inaccessible due to various strategic reasons. Moreover, as the main RF frequencies adopted for stud communication are either 868/915 MHz or 2.4 GHz, the radio coverage differs, and it is not readily predictable due to the low-power communication in the near proximity of the ground. This work delivers a reference study on low-power RF communication ranging for the two above frequencies up to 60 m. The experimental setup employs successive measurements and repositioning of a base station at three different heights of 0.5, 1 and 1.5 m, and is accompanied by an extensive theoretical analysis of propagation, including line of sight, diffraction, and wall reflection. Enhancing the tutorial value of this work, a correlation analysis using Pearson’s coefficient and root mean square error is performed between the field test and simulation results.

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Section: Methodsmentioning

confidence: 99%

Buried RF Sensors for Smart Road Infrastructure: Empirical Communication Range Testing, Propagation by Line of Sight, Diffraction and Reflection Model and Technology Comparison for 868 MHz–2.4 GHz

Marsic

Faramehr

Fleming

et al. 2023

Sensors

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“…A well-known technique to reduce the scattering of radome seams is to integrate metallic structures, such as wires or grids, within the volume of the dielectric seam, which is then said to be tuned [1][2][3][4]. The scattering reduction induced by these metallic structures can be explained in terms of internal current redistribution phenomena within the dielectric volume [1].…”

Section: Introductionmentioning

confidence: 99%

Metasurfaces for Far-Field Radiation Pattern Correction of Antennas under Dielectric Seamed-Radomes

et al. 2022

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A high-index dielectric radome seam is camouflaged with respect to a low-index dielectric radome panel by tuning the seam with carefully engineered metasurfaces. A transmission-line approach is used to model the metasurface-tuned seam and analytically retrieve the corresponding surface impedance, from which the unit-cell design is then tailored. Full-wave simulations and microwave antenna measurements performed on a proof-of-concept prototype validate the undesired scattering suppression effect in the case of normally and obliquely incident transverse electric and transverse magnetic wave illuminations. Robustness of the proposed solution to fabrication tolerances is also reported. The study presents metasurface-tuning as an easily implementable, frequency adjustable, and polarization insensitive solution to reduce the scattering of dielectric mechanical seams and improve the overall transparency performance of radome structures.

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“…[ 1–10 ] Plasmonic cloaking of dielectric spheres and cylinders can be achieved by enveloping the object with a dielectric coat, whose permittivity needs to be carefully engineered. [ 1–21 ] The realization of such cloaks requiring specific anisotropic material properties is often technologically challenging and is more inclined to losses due to the bulky nature of the cloak. Moreover, the addition of a bulky cloak inevitably increases the profile of the scatterer, which may not always be compatible with specific applications of the scatterer.…”

Section: Introductionmentioning

confidence: 99%

“…Such tuning techniques are thus, by definition, invasive and require the modification of the dielectric volume, in clear opposition to cloaking techniques that require an external cloak and do not inherently modify the scatterer. While wire‐tuning is a well‐known technique to reduce scattering from dielectric mechanical pieces, [ 11–14 ] the scattering reduction phenomenon is only effective when the electric field is parallel to the wires, clearly limiting the effectiveness of this solution for different polarizations of the impinging wave. This problem can be alleviated by using polarization‐insensitive grids instead of wires, but which are usually not optimized with respect to operating frequency and often rely on trial and error optimization procedures.…”

Section: Introductionmentioning

confidence: 99%

Camouflaging a High‐Index Dielectric Scatterer with Buried Metasurfaces

Cacocciola

Ratni

Mielec

et al. 2021

Advanced Optical Materials

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Metasurface‐tuning is presented as a solution to camouflage high‐index and electrically large dielectric parasitic scatterers. By incorporating metasurfaces into the dielectric volume of the scatterer, it is possible to reduce its scattering signature with respect to a given dielectric reference. The metasurface's surface impedance is retrieved analytically from a transmission‐line model and the induced field ratio parameter is introduced to characterize the scattering behavior of the scatterer. The scattering reduction effect achieved by the metasurfaces is validated with microwave near‐field full‐wave simulations and experiments for both normal and off‐normal transverse‐electric and transverse‐magnetic polarized incident wave illuminations. The study highlights the capability of metasurface‐tuning as a polarization‐insensitive and frequency‐adjustable solution to reduce spurious scattering from high‐index dielectric mechanical pieces such as seams in large ground‐based radio‐frequency antenna radomes.

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An Overview of Radomes for Large Ground-Based Antennas

Cited by 12 publications

References 8 publications

Buried RF Sensors for Smart Road Infrastructure: Empirical Communication Range Testing, Propagation by Line of Sight, Diffraction and Reflection Model and Technology Comparison for 868 MHz–2.4 GHz

Buried RF Sensors for Smart Road Infrastructure: Empirical Communication Range Testing, Propagation by Line of Sight, Diffraction and Reflection Model and Technology Comparison for 868 MHz–2.4 GHz

Metasurfaces for Far-Field Radiation Pattern Correction of Antennas under Dielectric Seamed-Radomes

Camouflaging a High‐Index Dielectric Scatterer with Buried Metasurfaces

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