Mutual Coupling Reduction Between Closely Placed Patch Antennas Using Complementary U-Shaped Polarization Converter

Odabaşi H., Salimitorkamani M., Turan G.

IEEE Antennas and Wireless Propagation Letters, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2023
  • Doi Number: 10.1109/lawp.2023.3276527
  • Journal Name: IEEE Antennas and Wireless Propagation Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: antenna arrays, Antenna arrays, Antenna measurements, Antennas, Etching, Mutual coupling, mutual coupling reduction, patch antenna, Patch antennas, Resonators, U-shaped polarization converter resonator
  • Eskisehir Osmangazi University Affiliated: Yes


This article presents mutual coupling reduction between two closely spaced $E$-coupled patch antennas using a complementary U-shaped polarization converter. The edge-to-edge distance of the antennas is $0.1\lambda _{0}$, and the proposed approach achieves an average of 8 dB for the $-10$ dB bandwidth and a maximum of 13 dB mutual coupling reduction in measurement. To reduce the increased cross-polarization results in the $E$- plane, L-shaped stubs are added to the upper and lower edges of the antennas. Thanks to the stubs, the cross-polarization levels are improved from $-12$ dB to a $-29$ dB for the $E$- plane. Due to its simple design, preserved radiation characteristics, and avoidance of ground plane etching, the antenna is a good candidate for next-generation antenna array applications requiring low mutual coupling and cross-polarization.