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A common method of antenna array synthesis uses least squares approximation to fit the radiation pattern of the array to a set of samples of an ideal desired pattern Fid. However, it has long been known that discontinuities in Fid prevent close approximation, and that sampling a target pattern Ftar that approximates Fid can afford better results. Here we show, for the case of circular planar arrays,...
A planar array composed of 41 parasitic dipoles above a ground plane, fed by an active dipole at 5 GHz was designed to obtain a pencil beam pattern with a moderate gain and bandwidth. Experimental results are in good agreement with the theory and show a pattern with an 18.78 dB gain, a sidelobe level (SLL) of -15 dB, an impedance bandwidth of 16.53% (the frequency range over which the value of S11...
The geometry of a planar array of parasitic dipoles is optimized to modify the pattern of an active dipole above a ground plane, in order to obtain a pencil beam of moderate gain and bandwidth without requiring a complex feeding network. As an example of application, a pencil beam pattern radiated by a planar array of parasitic dipoles fed by only one active dipole at 1.645 GHz is shown.
For tracking and search design array antennas is very usually the optimization of the main beam sum pattern to sidelobe level ratio, SLL, while still maintaining high directivity of the main beam. For tracking systems, a difference pattern is needed as an auxiliary pattern with a boresight null coincident with the beam peak of the main (sum) pattern. The tracking drive system moves the antenna positioner...
The complexity of antenna array feed networks can be reduced by reducing the number of radiating elements and having the remainder illuminate an auxiliary array of parasitic elements. The performance of such antennas can be optimized by optimization of their geometry. Here we consider parasitic linear arrays of dipoles illuminated by smaller uniformly fed linear arrays so as to generate low-sidelobe...
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