A high gain multiband offset MIMO antenna based on a planar log-periodic array for Ku/K-band applications

Area of Science:

• Electrical Engineering
• Electromagnetics
• Antenna Theory

Background:

• Wireless communication systems require efficient antennas for multiband operation.
• Multiple-Input Multiple-Output (MIMO) technology enhances data throughput and reliability.
• Ku/K-band frequencies offer significant bandwidth for high-speed wireless applications.

Purpose of the Study:

• To propose and design a novel offset quad-element, two-port, high-gain, multiband MIMO planar antenna.
• To achieve broadside radiation patterns and improved diversity parameters for wireless communications.
• To validate the antenna's performance for Ku/K-band applications.

Main Methods:

• Design of a single element antenna based on Carrel's theory.
• Optimization using a 50-Ω microstrip feed-line with two orthogonal branches.
• Fabrication on an RT-5880 substrate and experimental validation.

Main Results:

• The proposed MIMO antenna operates across multiple frequency bands within the Ku/K-range (e.g., 12.82-12.98 GHz, 13.54-13.96 GHz, 14.81-15.15 GHz, 17.7-18.52 GHz, 21.1-22.1 GHz).
• Achieved a peak gain of 4.2-10.7 dBi with a maximum element isolation of 23.5 dB without decoupling structures.
• Demonstrated favorable MIMO performance metrics, including low envelope correlation coefficient (ECC) and good mean effective gain (MEG).

Conclusions:

• The designed offset quad-element LPDA-based MIMO antenna is suitable for multiband wireless systems in Ku/K-bands.
• The antenna offers high gain, good isolation, and excellent diversity performance.
• The proposed design provides a viable solution for next-generation wireless communication applications.