Design of Multi-Band, Compact Parasitic Array With Twisted, Helical Directors

A new design for compact parasitic array is suggested in order to achieve multiple bands. The driver is folded for close spacing between the driver and the directors, and the directors are twisted in helical shapes with different radii and heights. The three proposed compact parasitic arrays have tw...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2013-01, Vol.61 (1), p.444-449
Main Authors: Yu, J. J., Sungkyun Lim
Format: Article
Language:English
Subjects:
Antenna arrays
Antenna measurements
Antenna radiation patterns
Antennas
Applied sciences
Arrays
Exact sciences and technology
Gain
multiple band antennas
parasitic antennas
Prototypes
Radiocommunications
Resonant frequency
Telecommunications
Telecommunications and information theory
Yagi-Uda arrays
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Summary:A new design for compact parasitic array is suggested in order to achieve multiple bands. The driver is folded for close spacing between the driver and the directors, and the directors are twisted in helical shapes with different radii and heights. The three proposed compact parasitic arrays have two, three, and four helical directors, and the number of directors results in the same number of resonances. At all generated resonances, the maximum measured realized gains in the direction of the directors are greater than 8.6 dBi, and the front-to-back ratios are greater than 9 dB. Both results are similar to those in a conventional two-element Yagi antenna, whilst the proposed design offers multiband operation and smaller overall volume.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2012.2220091