Multi-beam synthesis with null constraints by phase control for antenna arrays of arbitrary geometry

Comisso, M.; Vescovo, R.

doi:10.1049/el:20070167

Cited by 12 publications

(14 citation statements)

References 4 publications

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“…Substituting (6) into (4) we obtain the corresponding minimum (7) where is Hermitian because is Hermitian. Hence, the problem of minimizing (2) reduces to that of finding a phase function minimizing the functional in (7), and the corresponding vector by (6). Since is independent of , minimizing is equivalent to maximize the functional (8) In order to transform each integral in (5b) into a summation, we divide the integration interval into adjacent subintervals of equal length , and evaluate the integrand function at the centers of these subintervals, .…”

Section: The Auxiliary Phase Algorithm (Apa)mentioning

confidence: 99%

“…In [5], a phase-only algorithm based on a sequential quadratic programming (SQP) approach is proposed to form multiple main lobes and nulls for linear arrays. A fast phase-only control algorithm, based on the minimization of a weighted cost function including the design requirements, is presented in [6] to generate multibeam patterns satisfying null constraints for antenna arrays of arbitrary geometry. Two simple iterative methods of constrained pattern synthesis for arbitrary arrays are presented in [7], where the consistency between null constraints and DRR constraints is discussed.…”

Section: Introductionmentioning

confidence: 99%

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Fast Iterative Method of Power Synthesis for Antenna Arrays

Comisso

Vescovo

2009

IEEE Trans. Antennas Propagat.

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A fast and simple method of power synthesis for antenna arrays of arbitrary geometry is presented. The method adopts an auxiliary function having the desired amplitude pattern and a generic phase pattern, and determines in closed form the array pattern approximating the auxiliary function in both amplitude and phase. A cost function involving the auxiliary function and the approximating pattern is minimized by modifying the phase pattern of the auxiliary function, using a simple and fast iterative technique. Once the optimal phase pattern has been found, the array pattern approximating the corresponding auxiliary function is the synthesized pattern. The proposed method allows to satisfy stringent requirements on the amplitude pattern, including multibeam synthesis and radiation suppression within large angular regions. Numerical results show the effectiveness of the algorithm and are compared to those obtained using other existing methods. In order to achieve a more significant comparison such methods have been properly modified to improve their performances. Such comparison shows that the presented algorithm allows a significant reduction of CPU time with respect to the other considered methods, as well as a weaker dependence on the starting point. Finally, the presented method is extended in such a way as to reduce the dynamic range ratio (DRR) of the array excitations.Index Terms-Antenna arrays, dynamic range ratio (DRR) reduction, multibeam patterns, power synthesis, wide nulls.

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Section: The Auxiliary Phase Algorithm (Apa)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast Iterative Method of Power Synthesis for Antenna Arrays

Comisso

Vescovo

2009

IEEE Trans. Antennas Propagat.

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“…This suggests the usage of a phase-only control approach for the synthesis of the excitations, whose amplitudes hence have to be left constant and identical to avoid the installation of expensive power dividers. The development of phase-only synthesis techniques has been widely investigated, and thus a large number of solutions are already present [21][22][23][24][25][26][27], whose testing, except for [27], has been focused on the two-dimensional (2D) scenario. In this context, an interesting 3D clustered approach has been proposed in [28], where the array elements belonging to a cluster are characterized by a common amplitude and different phases.…”

Section: Introductionmentioning

confidence: 99%

3D Multi-Beam and Null Synthesis by Phase-Only Control for 5G Antenna Arrays

et al. 2019

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This paper presents an iterative algorithm for the synthesis of the three-dimensional (3D) radiation pattern generated by an antenna array of arbitrary geometry. The algorithm is conceived to operate in fifth-generation (5G) millimeter-wave scenarios, thus enabling the support of multi-user mobile streaming and massive peer-to-peer communications, which require the possibility to synthesize 3D patterns with wide null regions and multiple main beams. Moreover, the proposed solution adopts a phase-only control approach to reduce the complexity of the feeding network and is characterized by a low computational cost, thanks to the closed-form expressions derived to estimate the phase of each element at the generic iteration. These expressions are obtained from the minimization of a weighted cost function that includes all the necessary constraints. To finally check its versatility in a 5G environment, the developed method is validated by numerical examples involving planar and conformal arrays, considering desired patterns with different numbers of main beams and nulls.

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“…Many methods have been applied, with more or less success, with the perspective of improving the accuracy, the time processing, the stability, etc. (Vaskelainen, 1997;Khzmalyan and Kondrat'yev, 1996;Rodríguez et al, 1999;Comisso and Vescovo, 2007).…”

Section: Introductionmentioning

confidence: 99%

Conformal antennas arrays radiation synthesis using immunity tactic

Djennas

Benadda

Merad

et al. 2014

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to introduce to scientific community a new optimization technique and its application to the radiation synthesis case. Design/methodology/approach -The immunity tactic is a new powerful optimization tool inspired by immune system. It was used with success to achieve the conformal antenna radiation synthesis in an acceptable processing time.Findings -Radiation synthesis of conformal antenna arrays based on immunity tactic generates very good results compared with other optimization methods. The comparison is very satisfactory as regards accuracy and processing time.Research limitations/implications -The improvement of convergence and accuracy will be done certainly by use of other variants of the technique or combination with others. Originality/value -The paper exposes with details a new optimization technique based on immune system and its behavior. The results, for the special case of conformal antenna arrays radiation synthesis, are very satisfactory and very encouraging. The impact of the new technique will be, without doubt, positive on optimization field.

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Multi-beam synthesis with null constraints by phase control for antenna arrays of arbitrary geometry

Cited by 12 publications

References 4 publications

Fast Iterative Method of Power Synthesis for Antenna Arrays

Fast Iterative Method of Power Synthesis for Antenna Arrays

3D Multi-Beam and Null Synthesis by Phase-Only Control for 5G Antenna Arrays

Conformal antennas arrays radiation synthesis using immunity tactic

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