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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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Extra resources for Basic Principles of Fresnel Antenna Arrays
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 , 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 .
21 (a, b). Principle of construction of equiphase curves (after ). 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.