Site shielding of earth-station antennas

Bokhari, S.A.; Keer, M.; Gardiol, F.

doi:10.1109/74.370577

Cited by 5 publications

(6 citation statements)

References 26 publications

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“…One of the most simple, but effective ways to reduce the radiating interference is to introduce barriers or fins between the two coupled systems. This solution can be also useful in reducing radiating interference in earth satellite stations [1]. In particular, interference that arises from microwave links operating at the same frequency often arrives from directions close to the horizon; they may sometimes be attenuated by diffraction losses at natural barriers occurring in terrain propagation.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, for oblique incidence, more sophisticated anisotropic BC are needed. The total field at the observation point is described as the sum of the following contributions (1) in which is the incident plus reflected geometrical optics (GO) field, denotes singly diffracted ray-field contributions and doubly diffracted field contributions. Each contribution may or may not exist, depending on both the incidence and observation aspects as can be easily inferred from simple ray tracing.…”

Section: High-frequency Solutionmentioning

confidence: 99%

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Shielding effect of a thick screen with corrugations

Albani

Piazzesi

Capolino

et al. 1998

IEEE Trans. Electromagn. Compat.

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Abstract-The shielding effectiveness of a corrugated thick screen is theoretically and experimentally investigated. This screen consists of a half-plane of finite thickness in which corrugations are etched on the smaller side. This structure provides a significant attenuation in the shadow region for both polarizations of the incident field; thus, it can be effectively used for protecting apparatuses from radiating interference as well as for decoupling nearby operating antennas. The shielding properties of the screen are described by a highfrequency formulation that involves closed-form expressions.An experimental setup at X X X band has been arranged to test the effectiveness of a corrugated screen; the field in the shadow region is compared with that of a screen without corrugations. The experimental results compare very well with those obtained by the high-frequency expressions.

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Section: Introductionmentioning

confidence: 99%

Section: High-frequency Solutionmentioning

confidence: 99%

Shielding effect of a thick screen with corrugations

Albani

Piazzesi

Capolino

et al. 1998

IEEE Trans. Electromagn. Compat.

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“…Finally, it is important to distinguish the height of the aperture center above the ground, h e (which is the antenna center height above the ground, in meters), and the total height, h T,R , in meters, which includes the antenna dish. The total height is given by

where d ant is the antenna dish diameter, in meters, and θ is the antenna’s elevation angle in degrees [ 20 ]. Finally, it should be pointed out that the lowest value of diffraction loss is yielded when the barrier is approximately in the middle of the path between T and R ( D b = d TR /2), whereas the maximum loss is obtained when it is located close to T or R, respectively [ 19 ].…”

Section: Interference Scenario and Analysismentioning

confidence: 99%

“…Open construction is generally cheaper and easier to work with, providing less wind resistance than solid shields. An approximate expression for the transmission loss of a square-grid wire mesh (wire diameter much smaller than the wavelength) is given by

where g stands for the side length of the square, and λ is the wavelength of the signal [ 20 ]. For example, if a mesh barrier with g = 20 mm is selected, then for λ = 17 mm, L LOS = −7.4 dB, providing an adequate attenuation of the LOS signal.…”

Section: Interference Mitigation Techniquesmentioning

confidence: 99%

Coexistence of Satellite Ground Stations in Teleport Facilities: Interference Assessment, Real Application Scenario and Measurements

Moraitis

Panagopoulos

2022

Sensors

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This article introduces a unified and detailed methodology for interference assessment between coexisting fixed satellite service (FSS) and broadcast satellite service (BSS) with spectrum sharing at the Ka-band. The interference analysis is presented along with a step-by-step algorithm for the calculation of the carrier-to-interference ratio (CIR). The proposed procedure takes into consideration the near-field effect of ground-satellite-terminal antennas since these may reside at very close distances. Furthermore, numerical results are delivered so as to assess the CIR in relation to the relative geometry and the technical characteristics of the satellite terminals. A real application scenario is also provided along with measurements so as to validate the recommended methodology. Finally, mitigation techniques are proposed for the protection of the victim stations and operation under harmful interference conditions.

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“…However, these works have been limited to linearly polarized antenna systems. Some low-power examples of deep-space radiometry and satellite com munications using circular polarization can be found [19,20]. With practical highpower microwave sources coming closer to realization, it will be important to provide RF devices that can handle high power, and therefore this paper will focus on achieving better power handling in the septum design.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Power Capabilities of the Stepped Septum Using an Optimized Smooth Sigmoid Profile

Kim

Kovitz

Rahmat‐Samii

2014

IEEE Antennas Propag. Mag.

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The typical septum polarizer that has gained popularity in the literature may be unsuitable for high-power applications, due to the sharp corners in the design. In order to address this issue, the fundamentals of the septum operation are fi rst revisited, using a graphical visualization through full-wave analysis. A septum profi led with smooth edges is next presented, with enhanced power-handling capabilities in comparison to the stepped-septum polarizer. In this work, the sigmoid function is introduced to represent the smooth contour of the septum, and to enable diverse confi gurations without any discontinuities. The smooth and stepped profi les are optimized using the Particle Swarm Optimization (PSO) technique. The maximum electric-fi eld intensity around the smooth edges is investigated using a full-wave simulator, HFSS. Our observations show that the maximum electric fi eld is reduced by 40% in comparison to the stepped septum. In Appendix 1, the numerical approach is evaluated by comparing the exact series solution for the half-plane scattering problem with the simulated results in HFSS. In Appendix 2, a septum design with rounded edges is also studied as another possible design to reduce the maximum fi elds.

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Site shielding of earth-station antennas

Cited by 5 publications

References 26 publications

Shielding effect of a thick screen with corrugations

Shielding effect of a thick screen with corrugations

Coexistence of Satellite Ground Stations in Teleport Facilities: Interference Assessment, Real Application Scenario and Measurements

Enhancing the Power Capabilities of the Stepped Septum Using an Optimized Smooth Sigmoid Profile

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