TITLE:
A Low Profile Four-Way Directional Antenna with Dual Polarization
AUTHORS:
Rohani Bakar, Shumpei Fuse, Hiroyuki Arai, Yuki Inoue, Keizo Cho
KEYWORDS:
Directional Antenna, Dual Polarization, Dipole Antenna, Loop Antenna, Reflector
JOURNAL NAME:
Journal of Electromagnetic Analysis and Applications,
Vol.7 No.5,
May
26,
2015
ABSTRACT: This
paper presents a low profile dual polarized directional antenna composed of
loop and dipole arrays mounted on a ground plane with each loops and dipoles
being fed independently. Each loop antenna is paired with a reflector while
each dipole antenna is paired with a director and a reflector. The proposed
antenna is intended for an indoor base station (BS) with resonance frequency of
2.4 GHz and capable of producing four orthogonal directional pattern with
downward elevation angle equals to 30°; and half power bandwidth (HPBW) less
than 80°; in both vertical and horizontal polarization. The reflection
characteristics of the loop and dipole arrays are less than -10 dB and the
mutual coupling between the vertical and horizontal polarization elements is
nearly less than -20 dB. In later progress, the dipole antenna was substituted
with printed dipole antenna to achieve a better performance. Both the
calculated and measured results demonstrated that the desired radiation
patterns were achieved, and the measured results agreed well with the
calculated ones. Consequently, a low profile antenna with a thickness of 0.16 λ (20 mm) having the expected radiation
pattern is successfully designed.