Backscattering Measurements for Metallic Unclosed Spherical Screens

Radiation From Reflector Antenna of Finite Thickness and Conductivity in Resonant Scattering Band

“…The computational method was verified by cross-checking the values of the radar cross-section (RCS) σ [27] obtained for the spherical screen against the corresponding measured values presented in [14]. For the convenience of cross-checking, we substituted the plane electromagnetic wave into the equation system of Eqs.…”

“…Work [14] presents experimental RCS measurements for the aluminum spherical screen probed along its axis. The measurements were carried out for monochromatic illumination signals, whose frequency ranged from 26.2 GHz through 38.4 GHz, and the latter transforms into the values of k 0 b from 6.89 through 10.12.…”

“…Our computations indicated that in this particular range of values k 0 b, RCS of the screen strongly depends on the shape of its edge. The screens for the experiment in [14] were made manually; therefore, it was difficult to maintain the exact shape of the screen's edge according to variants 1 or 2 (as shown in Fig. 3) since the screen itself was quite small.…”

“…4, one can see that most part of experimental measurement curve is confined between the computed curves 2 and 3. Some differences given smaller values of σ πb 2 (7.25 < k 0 b < 8.25) are due to manufacturing inaccuracy of the spherical screens used in the experiment, due to measurement errors, and due to the influence of auxiliary elements used to fix the screens onto the value of field scattered by the screen in [14].…”

“…In a number of works [2][3][4][5][6][7][8][9][10][11][12][13], this problem has been solved under assumptions of infinitely thin and perfectly conducting screens. However, as shown in [14], in resonant wave scattering band (k 0 b ∼10, where k 0 is the wavenumber in free space, and b is the characteristic size of the screen described by the radius of the reflector's aperture), such an assumption can lead to great errors.…”