Analysis of the infinite array of slot impedance loads based on the cavity with an equilateral triangular cross section
Two-dimensional problem of an infinite array of slot impedance loads by the plane wave is considered. Each array element represents a slot in a perfectly conducting screen loaded by a cavity with equilateral triangle cross-section. The integral equations method is used to solve the problem, the Krylov-Bogoliubov method is applied to calculate them. For the case of H-polarized incident wave equivalent surface impedance dependencies on construction geometric sizes is calculated. Comparative analysis of dependencies obtained for construction under consideration of an infinite array of slot impedance loads with those ones for single impedance load is carried on.
Backscattering from an impedance loaded slotted cylinder
When a thick infinite cylinder is illuminated by a plane wave with a perpendicular electric field at normal incidence, its backscattering can be controlled by implementing an impedanced-backed longitudinal slot on its surface. An exact theory is developed to account for the scattered field from an impedance loaded slotted cylinder. Optimum slot loadings for minimizing and maximizing the backscattering from the cylinder are determined. A series of experiments has been conducted to verify the theory. Excellent agreement between theory and experiment is obtained. The present study indicates that a very effective reduction in the backscattering from the cylinder can be achieved by a proper design of the slot loading.
The echo area of small rectangular plates with linear slots
The echo area of rectangular plates on the order of 1\lambda \times 1\lambda in size and smaller with linear slots is discussed. Approximations are given which allow one to explain qualitatively the experimental results given. A \frac{1}{2} \lambda \times 1\lambda plate is considered both analytically and experimentally and by choosing the proper length slot or a slot with the proper reactive loading the echo area has been reduced by more than 8 db from the solid plate return.