Paper Info
Title
Directivity Optimization in Omnidirectional Volumetric Antenna Arrays
Abstract
Directivity pattern is a paramount performance measure in antenna array configurations. Applications such as heterogeneous MIMO wireless cellular communication can greatly benefit in exploring antenna directivity improvement. The problem of directivity optimization, which leads to a highly increasing in directivity gain on a certain desired angle of arrive/departure (AoA/AoD), is considered in this work. A new formulation on the volumetric array directivity problem is proposed using the rectangular coordinates to describe each antenna element, and the desired angle in spherical coordinates (θ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> , φ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ), with a general element pattern given by sin <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</sup> θ cos <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">v</sup> θ. To solve the associated optimization problem, the omnidirectional (cos θ) configuration was selected; besides, generalized scenarios, i.e ∀u, v ≠ 0, can easily be considered deploying a similar formulation. A well-defined genetic algorithm (GA) was selected to expeditiously solve the resultant non-convex optimization problem. Numerical results comparing achieved directivity for N=6,7 and 8 antenna-elements demonstrate gains of ~ 5 dB compared to the regular beamforming technique, using steering vector for uniform linear arrays (ULA) and uniform circular arrays (UCA).
Year
DOI
Venue
2019
10.1109/WCNC.2019.8885696
2019 IEEE Wireless Communications and Networking Conference (WCNC)
Keywords
Field
DocType
directivity optimization,omnidirectional volumetric antenna,directivity pattern,paramount performance measure,antenna array configurations,heterogeneous MIMO,cellular communication,antenna directivity improvement,directivity gain,desired angle,volumetric array directivity problem,rectangular coordinates,antenna element,spherical coordinates,general element pattern,associated optimization problem,omnidirectional configuration,resultant nonconvex optimization problem,8 antenna-elements,uniform linear arrays,uniform circular arrays
Beamforming,Topology,Omnidirectional antenna,Directivity,Computer science,MIMO,Antenna array,Real-time computing,Optimization problem,Spherical coordinate system,Genetic algorithm
Conference
ISSN
ISBN
Citations 
1525-3511
978-1-5386-7647-9
0
PageRank 
References 
Authors
0.34
2
2
Name
Order
Citations
PageRank
Bruno Costa1367.51
Taufik Abrão212636.18