NDLI: Synthesis of linearly polarised patterns of conical arrays by the method of least square

Content Provider	IET Digital Library
Author	Orazi, Homayoon Soleimani, Hadi Azadkhah, Reza
Abstract	Method of least squares is employed for pattern synthesis of non-uniform conical arrays using Euler rotation of coordinate axes. Design specifications involve beam-width of main-lobe, side-lobe and cross-polarisation levels. This method is effective for conformal arrays, because pattern multiplication is not applicable for them. Constructed error function depends on element spacing and current excitations (amplitudes and phases of input currents). Combination of conjugate gradient and genetic algorithms is used for its miniaturisation to determine element spacing and excitations. Recent literature on non-uniform arrays mostly deals with non-uniform excitations with complicated input networks. The non-uniformly spaced arrays will realise any specification obtained by non-uniform excitations. Two examples of non-uniform current excitations are presented. First example leads to reduction of side-lobe level (SLL) from 12 to 20 dB. Second example deals with different upper and lower SLLs. Third example treats non-uniform spacing, which results in the reduction of SLL from 12 to 18 dB. Fourth example synthesises both non-uniform spacing and unequal excitations, which provides the SLL reduction from 12 to 25 dB, besides the reduction of cross-polarisation level from 12 to 25 dB, compared with Qing- Qjang et al. 2011, which decreased SLL by only 8 dB.
Starting Page	185
Ending Page	191
Page Count	7
ISSN	17518725
Volume Number	9
e-ISSN	17518733
Issue Number	Issue 2, Jan (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/9/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2013.0719
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2014-09-25
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Array Beamwidth Conformal Antenna Conformal Array Conical Antenna Conjugate Gradient Algorithm Conjugate Gradient Method Constructed Error Function Coordinate Axes Cross-polarisation Level Current Excitations Element Spacing Euler Rotation Genetic Algorithm Interpolation And Function Approximation Least Squares Approximation Least Squares Method Nonuniform Conical Array Nonuniform Excitations Nonuniform Spacing Nonuniformly Spaced Array Numerical Analysis Optimisation Technique Pattern Synthesis Side-lobe Level SLL
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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