By Igor V. Minin, Oleg V. Minin
The short user-friendly fundamentals of antenna arrays -- Lens applicants to antenna array -- FZP lens array -- a few fields of lens array functions
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Extra resources for Basic Principles of Fresnel Antenna Arrays
It can be noted that the described results show only a possibility of diffractive photon crystal lens realization and could be optimized. Thus, we applied the principles of photonic crystal devices to the millimeter wave portion of the electromagnetic spectrum . For the lens, we have observed their collimation and imaging ability both shown in the amplitude and phase. The results described above show that the diffractive photon-crystal lens is a perspective candidate to subwavelength focus lens as an array element.
Phases, on the other hand, are defined by position of a grating of radius R0 at coordinate r (where the grating begins), and an initial phase from which the periodic transmitting function t(r) will start at the point r = R0. 40 1 The Brief Elementary Basics of Antenna Arrays R0 Fig. 20 Circular grating Let us write down the expression of a spatial part of an electric field of a wave in Fraunhofer zone diffraction E (r), through a field of a wave at once behind grating A (r). Let us analyze a circular aperture in the Fraunhofer approximation, namely a distant source and a distant observation point.
I/Imax is the normalized field intensity at the distribution peak. 3. I0/I is the intensity of the central (axial) maximum relative to the maximum intensity within the ring. 4. Δr is the width of the ring at the indicated intensity levels. The results shown in Fig. 1 imply that even for binary diffractive elements, the field intensity distribution function can be corrected in the focal area by choosing R0. Similar effects are achieved also for elements that focus radiation onto an area of arbitrary shape, for instance, onto longitudinal or transversal segments, an ellipse, a transversal (relative to the optical axis) smooth curve, etc.