Abstract
An offset quad-element, two-port, high-gain, and multiband multiple-input multiple-output (MIMO) planar antenna based on a log-periodic dipole array (LPDA) for Ku/K-band wireless communications is proposed, in this paper. A single element antenna has been designed starting from Carrel’s theory and then optimized with a 50-Ω microstrip feed-line with two orthogonal branches that results mainly in a broadside radiation pattern and improves diversity parameters. For experimental confirmation, the designed structure is printed on an RT-5880 substrate with a thickness of 1.57 mm. The total substrate dimensions of the MIMO antenna are 55 × 45 mm2. According to the measured results, the designed structure is capable of working at 1.3% (12.82–12.98 GHz), 3.1% (13.54–13.96 GHz), 2.3% (14.81–15.15 GHz), 4.5% (17.7–18.52 GHz), and 4.6% (21.1–22.1 GHz) frequency bands. Additionally, the proposed MIMO antenna attains a peak gain of 4.2–10.7 dBi with maximum element isolation of 23.5 dB, without the use of any decoupling structure. Furthermore, the analysis of MIMO performance metrics such as the envelope correlation coefficient (ECC) and mean effective gain (MEG) validates good characteristics, and field correlation performance over the operating band. The proposed design is an appropriate option for multiband MIMO applications for various wireless systems in Ku/K-bands.
Highlights
Because of the rapid developments in wireless systems, multiple-input multiple-output (MIMO) technologies have attracted much attention from engineering institutes and the research community
The loss of path can be compensated by high gain antennas, whereas the MIMO antennas are crucial to minimize the effect of multipath fading and channel interference, as mentioned
To verify the results achieved in the simulation, the proposed multiband MIMO planar log-periodic array (PLPA) design is fabricated, and experimental tests are conducted for measurements
Summary
Because of the rapid developments in wireless systems, multiple-input multiple-output (MIMO) technologies have attracted much attention from engineering institutes and the research community. This article proposes an integrated 4-element offset MIMO antenna system based on a planar log-periodic array (PLPA) to improve the multiband, radiation gain, and efficiency characteristics.
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