By Igor V. Minin, Oleg V. Minin
The short trouble-free fundamentals of antenna arrays -- Lens applicants to antenna array -- FZP lens array -- a few fields of lens array functions
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10 FZPA in Reflection Mode (left) and Transmission Mode with Reflector (right) In the paper , an alternative feed method was investigated, which enhances the aperture efficiency of the FZPA in transmission mode while allowing for a potentially significant reduction in profile. Instead of placing a reflecting surface behind the FZPA, it was placed at the aperture of the feed antenna as shown in Fig. 10. With this geometry, the FZPA could be fed using a planar antenna such as a microstrip patch.
I 2 3 50 1 0 0,04 0,08 0,12 0,16 r/D Fig. 23 Field intensity distribution along the radius of the focusing ring Curve 1 in Fig. 23 shows the distribution of field intensity in the focal plane along the ring radius of the known solution (R0 = 0) while curve 2 gives the result of optimization of the binary element with the central maximum suppressed. The optimization consisted in minimizing the field intensity on the optical axis of the diffractive element R0: R0: I ∼ min ⎪U(x = 0, y = 0, B)U*(x = 0, y = 0, B)⎪.
23, the stray central maximum of field intensity can be essentially “suppressed” by choosing a suitable value of R0. The gist of the effect observed is as follows. The boundary of each zone on the surface of a diffractive element is a source of toroidal convergent boundary waves, so that in-phase constructive interference of these waves can be observed not only in a prescribed space (at a point Rk) but also in some different locality, for instance on the optical axis where the effect reaches its maximum.
Basic Principles of Fresnel Antenna Arrays by Igor V. Minin, Oleg V. Minin