DocumentCode :
3538493
Title :
Ultra-wideband tightly coupled fractal octagonal phased array antenna
Author :
Farhat, Eman O. ; Adami, Kristian Z. ; Yongwei Zhang ; Brown, Anthony K. ; Sammut, Charles V.
Author_Institution :
Dept. of Phys., Univ. of Malta, Msida, Malta
fYear :
2013
fDate :
9-13 Sept. 2013
Firstpage :
140
Lastpage :
144
Abstract :
This paper presents a low profile ultrawideband tightly coupled phased array antenna with integrated feedlines. The aperture array consists of planar element pairs with fractal geometry. In each element these pairs are set orthogonal to each other for dual polarisation. The design is an array of closely capacitively coupled pairs of fractal octagonal rings. The adjustment of the capacitive load at the tip end of the elements and the strong mutual coupling between the elements, enables a wideband conformal performance. Adding a ground plane below the array partly compensates for the frequency variation of the array impedance, providing further enhancement in the array bandwidth. Additional improvement is achieved by placing another layer of conductive elements at a defined distance above the radiating elements. A Genetic Algorithm was scripted in MATLAB and combined with the HFSS simulator, providing an easy optimisation tool across the operational bandwidth for the array unit cell design parameters. The proposed antenna shows a wide-scanning ability with a low cross-polarisation level over a wide bandwidth.
Keywords :
antenna feeds; antenna phased arrays; aperture antennas; fractals; genetic algorithms; planar antenna arrays; ultra wideband antennas; HFSS simulator; MATLAB; aperture array; array bandwidth enhancement; array impedance; array unit cell design parameters; capacitive load adjustment; dual polarisation; feedline integration; fractal geometry; fractal octagonal rings; frequency variation; genetic algorithm; low cross-polarisation level; low profile ultrawideband tightly coupled phased array antenna; operational bandwidth; optimisation tool; planar element pairs; strong mutual coupling; ultra-wideband tightly coupled fractal octagonal phased array antenna; wideband conformal performance; Arrays; Bandwidth; Broadband antennas; Broadband communication; Fractals; Aperture array; capaitively coupled phased array; cross polarisation; fractal octagon rings;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electromagnetics in Advanced Applications (ICEAA), 2013 International Conference on
Conference_Location :
Torino
Print_ISBN :
978-1-4673-5705-0
Type :
conf
DOI :
10.1109/ICEAA.2013.6632208
Filename :
6632208
Link To Document :
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