Abstract
This paper describes a model for the analysis of multilay-ered chiral structures containing planar electric and magnetic scattering elements of arbitrary shape, illuminated by an elliptically polarized plane wave. The particular case of a single chiral layer is analyzed and the scattering matrices for single and dual electric and/or magnetic dipole distributions are derived in an original way. As an application, the polarimetric response of a short electric or magnetic dipole is directly obtained from their scattering matrix.
Highlights
The development of polarimetric synthetic aperture radars (PolSAR) introduced new possibilities of active microwave remote sensing of the Earth [1], [2]
PolSAR imaging techniques have been applied to the analysis of man-made structures and urban areas, despite the complexity added in these cases by the number and variety of elements involved in the electromagnetic scattering [5], [6]
The problem of electromagnetic scattering and propagation in structures composed of multiple layers of complex media appears often in microwave SAR remote sensing, and in other diverse applications, such as: microstrip antennas, microwave monolithic integrated circuits (MMIC), printed circuit technology, mobile and wireless communications, medical imaging and diagnosing, geophysical mapping and planetary exploration
Summary
The development of polarimetric synthetic aperture radars (PolSAR) introduced new possibilities of active microwave remote sensing of the Earth [1], [2]. For an electrically dense medium, where scatterers are compactly distributed or the radiation frequency is such that the spacing between them is comparable to the wavelength, the fundamental RT assumption of independent scattering from the elements is no longer valid, requiring either complex model adjustments or a different model altogether [9] Another important consideration for the accuracy of a PolSAR remote sensing model is the dielectric properties of the media that constitute each layer. To derive from such model the scattering matrices associated with planar electric and magnetic dipoles located at either one or both interfaces of a single chiral layer structure, resulting in manageable analytical expressions presented here in an original way.
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