SCATiERlNG FROM THIN DIELECTRIC DISKS
نویسنده
چکیده
A solution has been obtained for s, ,ring from thin dielectric disks by approximating the currents induced inside the disk with the currents which would exist inside a dielectric slab of the same thickness, orientation and dielectric properties. This approximation reduces to an electrostatic approximation when the disk thickness, T, is small compared to the wavelength of the incident radiation and the approximation yields a conventional physical optics solution when the dimension, A. characteristic of the geometrical cross section of the disk (e.g. the diameter of a circular disk) is large compared to wavelength. When the ratio A/T is sut'ficiently large t hc disk will always be in one or the other of these reg;mes (Tc cX or k A > > 1). Consequently, when A/T is large this solution provides a conventional approximation for the scattered fields which can be applied at all frequencies es. As a check on this conclusion, a comparison has bfxn made between the theoretical and measured radar cross section of thin dielectric disks. Agreement was found for thin disks with both large and small values of kA.
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