By Y.T. Lo
Quantity 1: Antenna basics and Mathematical recommendations opens with a dialogue of the basics and mathematical thoughts for any form of paintings with antennas, together with uncomplicated rules, theorems, and formulation, and strategies. DLC: Antennas (Electronics)
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Additional info for Antenna Handbook - Theory
45. 1 A variety of optical phenomena that can be accurately analyzed using scalar diffraction theory. (a) Diffraction from an aperture. (b) Focusing by a thin lens. (c) Diffraction by a grating. used to introduce the solution. In Fig. 2, light traveling in the positive z direction is diffracted by an aperture located in the x–y plane at the origin of the coordinate system. The distribution of the ﬁeld in that plane is given by P(x, y, 0) and the diffracted ﬁeld P(X, Y, Z) is evaluated in a plane parallel to the aperture at a distance Z.
To simplify Maxwell’s equations for optical modeling, we immediately make several assumptions:1–3 (1) For light to propagate, the medium must be uncharged and nonconducting (ρ = 0, σ = 0). (2) The material is homogeneous and uniform; μ and ε do not vary with position in the material or change with time. (3) The material is isotropic, so μ and ε do not vary with orientation. (4) The material is linear, so μ and ε do not change in the presence of electric or magnetic ﬁelds. These assumptions are true for most optical materials.
20) which can also be written as h(X) = f (x) ⊗ g(x). In effect, the function f (x) multiplies g(x) at all values of x for each value of X and gives a function h(X). The simplest example is a function convolved with itself [f (x) = g(x)]. For example, let f (x) = rect(x/b) where rect(x/b) · 1 in the range −b/2 < x < b/2 and zero elsewhere [Fig. 3(a)]. One way of thinking about the convolution of two rect functions is that the convolution consists of the overlap of the areas between the two functions after one of the functions is reversed (x → −x).