Open AccessCompact, two‐element array with high broadside directivity
Author(s) -
Tang MingChun,
Ziolkowski Richard W.
Publication year - 2013
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.2012.0706
Subject(s) - broadside , directivity , optics , dipole antenna , antenna (radio) , coupling (piping) , antenna array , impedance matching , physics , dipole , collinear antenna array , acoustics , radiation pattern , electrical impedance , materials science , slot antenna , engineering , telecommunications , quantum mechanics , metallurgy
A combination of two high directivity, electrically small, slot‐modified conducting disc‐augmented Egyptian axe dipole (EAD) antennas is investigated to achieve interesting broadside radiation properties, including a high broadside directivity and front‐to‐back ratio. Their array arrangement is guided by a simple two‐element dipole model. The parasitic conducting disc associated with each EAD antenna is modified only slightly from their original single‐element dimensions to preserve nearly complete matching to their sources, to accommodate the coupling between the two elements and to maximise the array pattern characteristics. Parameter studies lead to a final design, whose simulation results demonstrate that the two‐element array has outstanding performance characteristics, including a 9.98 dB broadside directivity, an 88.19% radiation efficiency, a 20.03 dB front‐to‐back‐ratio, a − 22.42 dB mutual coupling level, more than a 30 dB level of polarisation purity, and good impedance matching to their respective 50 Ω sources, despite each antenna being electrically small, that is, ka < 1, and the distance between the centre of each element being only slightly larger than a half wavelength.