TITLE:
Dual Band MIMO Antenna Composed of Two Low Profile Unbalanced Fed Inverted L Antennas for Wireless Communications
AUTHORS:
Erfan Rohadi, Mitsuo Taguchi
KEYWORDS:
Dual Band MIMO, Inverted L Antenna, ILA, Low Profile Antenna, Parasitic Element, Correlation Coefficients, ISM, WCS
JOURNAL NAME:
Wireless Engineering and Technology,
Vol.5 No.3,
July
11,
2014
ABSTRACT:
A low profile dual-band multiple-input-multiple-output (MIMO) antenna
system is proposed. The proposed MIMO antenna consists of two low profile unbalanced
fed inverted L antennas with parasitic elements to resonate at 2.45 GHz and 5
GHz. The structure is uncomplicated by locating two ultra low profile inverted L
antennas on the finite conducting plane. The proposed MIMO antenna is numerically
and experimentally analyzed. When the size of conducting plane is 55 mm by 55
mm and the height of antenna is 9 mm, the directive gain of
4.11 dBi and the S11 bandwidth of 5.71% are achieved for lower frequency of 2.45 GHz. At the upper frequency of 5 GHz, the directive gain of 8.22 dBi and
the S11 bandwidth of 6% are obtained. The proposed antenna has good diversity gain, shown by the correlation
coefficient becomes less than 0.005 at the frequency of 2.45 GHz and 5 GHz band
when the distance between inverted L elements is 41 mm. A good agreement between calculated and
measured results is obtained. The results show that the weak mutual coupling of
the proposed antenna and this feature enables it to cover the required
bandwidths for WLAN operation at the 2.4 GHz band and 5 GHz band.