Short Pulse Scattering Measurements on Conducting Cylindrical Cavities
Since the founding paper of Crispin and Maffett 1 and that of Witt and Price 2 in the sixties, many authors have studied the plane wave scattering of a hollow circular cylinder with a Perfect Electric Conductor-termination, seen as a simplified model of a jet intake. A more realistic model of a jet intake has been later proposed by Moll and Seekamp 3, who designed the termination of the cylinder in the form of a multirowed bladed structure in order to represent the first stages of the jet engine. By regarding the duct as an excited waveguide and applying appropriate techniques that take into account the various modes propagating in the cavity, they predicted the monostatic RCS pattern as a function of the aspect angle for different termination depths. Their results show in particular that a short circuit termination for the cavity is generally a worst case in comparison with the idealized bladed structure with regard to the monostatic RCS. It is worth noting that these results refer only to the echo from the interior of the intake because the contribution from the exterior surfaces is not taken into account in the model.
KeywordsGround Plane Circular Waveguide Aspect Angle Aperture Area Cross Section Waveguide
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