Basic Principles of Fresnel Antenna Arrays by Igor V. Minin, Oleg V. Minin

By Igor V. Minin, Oleg V. Minin

The short simple fundamentals of antenna arrays -- Lens applicants to antenna array -- FZP lens array -- a few fields of lens array purposes

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By Igor V. Minin, Oleg V. Minin

The short simple fundamentals of antenna arrays -- Lens applicants to antenna array -- FZP lens array -- a few fields of lens array purposes

Show description

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Typically, triangular and square hole arrangements are used. The important difference between the two arrangements is the area between holes, which has a strong bearing on the amount of holes that can be packed together, also called the filling factor. 30 1 The Brief Elementary Basics of Antenna Arrays It can be shown that the triangular lattice has the bigger fill factor and thus will enable a larger range of effective dielectric constants to be achieved. Using this lattice arrangement in [37], the authors designed a quarter-wave PCFL antenna with aperture efficiency of 35% at 30 GHz with F/D=1 and D=15 cm.

By varying the size and spacing of the holes, it is possible to vary the effective dielectric constant through a range of values. The bigger the hole, the more air will be present, which will cause the effective dielectric constant to decrease. The range of dielectric constants is limited; however, if the separations between the holes in this lattice is kept small compared to the operating wavelength, the substrate will appear to have a uniform effective relative permittivity. This means that both the spacing between holes and the hole diameters must be small compared to the operating wavelength [19].

21 (a, b). Principle of construction of equiphase curves (after [63]). Obviously, to focus radiation at a point F, it is necessary (for a binary element) that the difference between the eikonals of the incident and diffracted rays, ⎪IOF⎪ and ⎪IM + FM⎪ be a multiple of λ/2 (see Fig. 21a). Since the phase shifts on the boundaries between the neighboring zones have opposite signs, transparent and opaque zones alternate. 4 Reference Phase Concept 43 built until recently followed this principle. On the other hand, the central zone of a diffractive element can be ether transparent or opaque for the incident radiation.

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