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An improved calculation technique allowing the radar cross section computation of electrically large targets is presented in this paper. It is based on a hybridization technique combining the Geometrical Optics (GO) and the Physical Optics (PO) techniques. The GO technique takes high order interactions into account while the PO technique allows to get rid of caustics problems. The Physical Theory...
This paper presents 5 different electromagnetic methods, asymptotic and exact, in 3 dimensions and in 2 dimensions, to simulate the radiation of an antenna in a U-shaped valley. The precision of the result and the calculation time are compared for each method.
By taking into account the real modal content coming from the connected stage, instead of the fundamental waveguide mode only, a horn antenna can be designed to cope with the imperfections at its input. Unwanted higher order modes are often responsible for performance degradation and hence bandwidth limitation. The design procedure is applied for two types of horns, dedicated to different applications,...
A kriging method has been used to interpolate the value of the scintillation indices over a region, using a limited number of samples. This method has been combined with the Global Ionospheric Scintillation Model (GISM) to estimate the scintillation level over a region, using data collected by GNSS receiver.
A hybridization method of Geometrical Optics and Physical Optics (POGO) has been developed to calculate the radar cross section (RCS) of electrically large targets. The GO technique takes high order interactions into account while the PO technique allows to get rid of caustics problems. This hybrid technique is well suited to calculate the field radiated by meteorological radars and backscattered...
Radiating element optimization is a key factor to improve the overall performances of an array antenna: its type and design must meet RF specifications while being competitive in terms of cost, bulkiness and weight. This paper focuses on the design, manufacturing and test of a splineprofile square horn, designed to be used for telecommunication focal array applications with high efficiency requirements
The methods of geometrical optics and physical optics are particularly well adapted to calculate the RCS (Radar Cross Section) of targets with dimensions very large as compared to the incident electromagnetic field wavelength. The geometrical optics (GO) technique is a very fast technique allowing to take high order interactions into account. However, it fails to calculate the scattered field on occurrence...
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