NDLI: Fast power pattern synthesis with near-field control for antenna arrays

Content Provider	IEEE Xplore Digital Library
Author	Comisso, M. Vescovo, R.
Copyright Year	2009
Description	Author affiliation: Dipartimento di Elettrotecnica, Elettronica ed Informatica, University of Trieste, Via A. Valerio 10, 34127, Italy (Comisso, M.; Vescovo, R.)
Abstract	The proposed method is applied to a two-ring circular array lying in the x - y plane, consisting of center-fed thin dipoles of length λ/2, parallel to the z axis. The inner ring has 8 equally spaced elements and radius equal to 0.6λ, while the outer ring has 16 equally spaced elements and radius equal to 1.2λ. The desired pattern F0(ϕ) has the maximum at 65 degrees, a maximum side-lobe level of −30 dB, and a Laplacian interference region centered at −120 degrees. The weight function is selected as w(ϕ) = $F0(0)^{−µ},$ where µ is a positive constant. The N electric field components En(r) have been evaluated using the SuperNEC 2.7 electromagnetic simulator. Fig. 1 shows the patterns synthesized for µ = 2.2 and wE = 0 (absence of near-field control), and the patterns synthesized for µ=2.9 and wE $=10^{4},$ when a reduction of the electric field \|Ez\| is required in the region θ = {(x, y)∈[5λ, 15λ]×[5λ, $15λ]⊂ℝ^{2}}.$ All results are obtained using the starting point $Φ^{0}$ = [0, …, 0] with K = 30 and ε = $10^{−5}.$ The figure shows that the far-field pattern requirements are completely satisfied both in absence of near-field control and when a reduction of the electric field in the region of interest θ is desired. A considerable advantage of the proposed method lies in the low CPU time required to perform the synthesis. In particular, in absence of near-field control, the synthesis is performed in 10 milliseconds, while in presence of near-field control the synthesis is performed in 30 milliseconds. The low CPU time is substantially due to the closed form evaluation of the current phase vector $Φ^{q}$ and to the possibility of using a reduced number of samples K to approximate the phase function Φ(ϕ). This second characteristic of the method reveals that even a rough estimation of the phase pattern can be sufficient to obtain a satisfactory amplitude pattern. Further advantages of the proposed method are the weak dependence of the synthesized patterns and of the CPU time on the starting point, and the possibility of applying the presented algorithm to antenna arrays of arbitrary geometry.
Starting Page	1
Ending Page	4
File Size	851122
Page Count	4
File Format	PDF
ISBN	9781424436477
ISSN	15223965
DOI	10.1109/APS.2009.5171586
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Antenna arrays Phased arrays Geometry Iterative methods Directive antennas Azimuth Antenna radiation patterns Region 8 Cost function
Content Type	Text
Resource Type	Article

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