Boris Z. Katsenelenbaum

Reducing the Backscattering via Complex Impedance Coating

A method for reducing the back scattering from bodies with complex impedance boundaries is developed. A nonlinear integral equation system providing zero backscattering is obtained for determining the impedance distribution on the boundaries of infinite cylinders. Numerical results for circular and elliptic cylinders are given. Frequency dependence of backscattering at obtained optimal impedance is discussed on the example of circular cylinder.

Calculation of Complex Impedance Coating for the Back Scattering Minimization

A method for decreasing the back scattering from bodies having complex impedance boundaries is developed. A system of nonlinear integral equations is given for determining the impedance distribution which provides minimal back scattering. Numerical results for a model problem of scattering on the infinite circular cylinder are given. Frequency dependencies of scattering at obtained impedance distributions are shown.

Theoretical aspects of antiradar body protection by surfaces with impedance and dielectric coatings

The theoretical ideas and numerical techniques are described which permit to determine the coatings parameters providing for bodies of different shape their invisibility from the direction of one-position radar. The “invisibility” means that the scattered field, arising when a wave radiated by the radar falls on the body, equals zero at the direcrion where the radar is located. This condition is stated for all orientations of the radar with respect to the body. The both impedance and dielectric (nonmagnetic) coatings are considered. The first results related to the protection of nonplanar surfaces are presented and possible directions of further investigations in this field are pointed out.

My teacher M. A. Leontovich

My teacher, the person who taught me the profession of scientist, was Mikhail Alexandrovich Leontovich. His teacher was Leonid Isaakovich Mandelstam. When studying at the Moscow University, I attended his physical seminar several times. Usually, “entire physical Moscow” met there. For the students this seminar was quite complicated. In fact, I understood very little from the reports, but resuming words of L.I. were, as a rule, understandable. Now I know that if the speaker understands what he made, then he can explain the essence of his work in a form clear to “almost anyone”. The technique can be complicated but the logic is always simple.

Matching the complex impedance of the body with the field of incident wave

An electromagnetic wave falls onto a body. The body position is fixed with respect to the wave. The surface impedance of the body can be matched with the wave field structure in such a way that the scattered field is small in the direction opposite to that of the incoming wave as well as in the close directions. The matching means that the impedance at each point of the illuminated surface provides the same relation of tangential components of the electric and magnetic fields as in the incident wave. If the incident wave is the plane one, then the matching impedance is real.