Open AccessNear field multifocusing on antenna arrays via non‐convex optimisation
Author(s) -
Álvarez Jana,
Ayestarán Rafael G.,
León Germán,
Herrán Luis F.,
Arboleya Ana,
LópezFernández Jesús A.,
LasHeras Fernando
Publication year - 2014
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2013.0563
Subject(s) - antenna (radio) , focus (optics) , planar array , antenna array , planar , computer science , field (mathematics) , electronic engineering , regular polygon , function (biology) , phase (matter) , algorithm , mathematical optimization , mathematics , engineering , telecommunications , optics , physics , geometry , computer graphics (images) , pure mathematics , quantum mechanics , evolutionary biology , biology
An optimisation framework for near field multifocusing on antenna arrays is proposed. Its aim is to obtain the feeding weights that must be applied to the elements of the array so that the antenna focuses on two or more targets simultaneously. The method is based on the definition of a proper cost function, which is minimised using an optimisation algorithm over an equivalent least squares problem. The success of the technique is noted in the fact that different array parameters can be obtained: magnitude and phase of the array elements or only phase synthesis. In order to show the efficiency of the method, several tests are carried out using different arrays and optimisation parameters. The simulation, manufacture and measurement of an 8 × 8 planar array able to focus on two different targets is also performed. Results show how the framework can be applied to general arrays and demanding requirements, so it may be easily extended to different synthesis problems besides multifocusing.