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.
Equivalent surface impedance of slot impedance loads incorporated into infinite gratings
Two types of slot impedance loads (SILs) incorporated into infinite gratings are considered. These types of loads are designed on the basis of a parallel-plane waveguide and a rectangular cavity. The equivalent surface impedance is controlled using a planar conductor placed in the aperture. The equivalent surface impedance is determined from the numerical solution to an integral equation. The results of calculations are presented in the form of dependences of the impedance on basic geometric parameters and the angle of incidence of the plane wave. It is shown that for SILs incorporated into infinite gratings, the dependence of the impedance on the angle of incidence of the plane wave is less pronounced in comparison with an individual unit.
A new method of minimizing the backscatter of a conducting plate
A new method has been developed for minimizing the back-scatter of a conducting plate. This method consists of placing a loaded wire loop in front of the plate. By adjusting the loading of the loop the induced current on the loop can be modified to cancel the effect of the induced current on the plate so that the total backscatter is minimized. This method has been verified experimentally to be very effective (up to 25 dB reduction) and it should have great practical applications.