Basics on Radar Cross Section Reduction Measurements of Simple and Complex Targets Using Microwave Absorbers

In radio cellular networks, base transceiver station (BTS) powered by hybrid energy (solar / wind / fuel) has become an efficient and attractive solution to help to reduce the use of fossil fuel based energy. Such hybrid energy BTSs have been deployed in remote areas with small wind turbines (SWT) located on top of BTS pylon or on a separate mast. Because megawatt WTs or wind farm disturb various radio systems (radars, TVs), the proximity between SWT and BTS raises questions about electromagnetic compatibility. In the context of the OPERA-Net2 European project, these questions are being studied through this original work. Based on the conclusions, for the first time ever installation recommendations could be proposed to reduce the radio impact of SWTs. Compared to megawatt WTs, SWTs with nominal power range of 1.5 -7.5 kW are much more diverse (shapes, materials). Thus, a representative model (RSWT) has been designed. Its size was optimized to improve the match with realistic models, notably the Nheowind 3D100 wind turbine (NHEOLIS -IDSUD ENERGIES). A prototype of the RSWT with dimensions scaled down by 10 was manufactured. Based on the RCS of this prototype measured in an anechoic chamber at 9 GHz and 17 GHz, the scattering (or RCS) of the designed RSWT at radio cellular frequencies could be determined. Comparisons between simulation and measurement at these frequencies show good agreement thus validate the RSWT modelling.I.

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“…As shown in [13], there are two main methods: direct and indirect calibrations. The first one is done in this study.…”

Section: ) Calibrationmentioning

confidence: 99%

Small wind turbines on pylon powering base transceiver stations: A study of radio interactions

Pennec

Aubree

et al. 2014

2014 IEEE 36th International Telecommunications Energy Conference (INTELEC)

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“…Van der Ven and Schippers [34] also provided an HRRP for a civilian jet engine inlet, and reported the CPU time and memory required for the simulation. Miacci and Rezende [35] discussed the basic effects of radar absorption materials (RAM) on radar cross section reduction (RCSR) for simple and complex targets. Wang et al [36] studied the RCS of a curved inlet using an iterative physical optics method.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of an S-Shaped Air Inlet on the Reduction of Front Bistatic Radar Cross Section of a Fighter Engine

Chung¹,

Tuan²

2021

PIER B

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The engine of a fighter plane is one of the largest scattering centers of the entire aircraft. One possible way of reducing the radar cross section (RCS) of the engine is to use an S-shaped bending air inlet to avoid direct radar wave illumination and reflection. We evaluate the efficacy of an S-shaped air inlet on RCS reduction by simulating the boresight and ±15 • bistatic RCS for a digital model of an engine located behind an S-shaped inlet, using a multi-level fast multipole method (MLFMM) code in the S and X bands. The results show that a curved S-type air inlet can reduce the engine boresight bistatic RCS by ∼ 10-12 dBsm at 3 GHz, and ∼ 16 dBsm at 10 GHz when radar wave is incident from boresight, but not to the level required by RF stealth standards. When the radar waves are incident from θ = 105 • ϕ = 90 • or θ = 90 • ϕ = 345 • , the RCS reduction is less effective, which is the results of the bend direction of the S-type air inlet.

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“…Los materiales absorbentes (RAM) reducen la energía reflejada mediante diferentes técnicas de absorción (Miacci & Rezende, 1988). Los materiales tradicionales se fabrican dispersando partículas electromagnéticas en un material base.…”

Section: Medidas Con Modelos a Escalaunclassified

Aplicación de la inteligencia artificial a la defensa de un buque contra misiles de guía de radiofrecuencia mediante señuelos

Gil¹

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Basics on Radar Cross Section Reduction Measurements of Simple and Complex Targets Using Microwave Absorbers

Cited by 15 publications

References 10 publications

Small wind turbines on pylon powering base transceiver stations: A study of radio interactions

Small wind turbines on pylon powering base transceiver stations: A study of radio interactions

Efficacy of an S-Shaped Air Inlet on the Reduction of Front Bistatic Radar Cross Section of a Fighter Engine

Aplicación de la inteligencia artificial a la defensa de un buque contra misiles de guía de radiofrecuencia mediante señuelos

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