A Parasitic Decoupling Structure for Dual-polarized Patch Antenna Arrays

• Published in: IEEE antennas and wireless propagation letters Vol. 22; no. 6; pp. 1 - 5
• Main Authors: Xie, Mingcong, Wei, Xizhang, Tang, Yanqun, Hu, Dujuan
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antenna measurements; Antennas; Cogeneration; Correlation coefficients; Couplings; Decoupling; Dual polarization (waves); dual-polarized microstrip antenna array; isolation; Microstrip; Microstrip antenna arrays; Microstrip antennas; Mutual coupling; Parasitic elements (antennas); Patch antennas; Polarization; simultaneous transmitting and receiving
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2023.3242002

In this letter, a simple parasitic structure consisting of a microstrip L-section array and a microstrip U-section array is proposed for mutual coupling reduction of dual-polarization (DP) patch antenna array. The additional coupling paths are introduced by the structure in the co-horizontal polarization (CHP) and co-vertical polarization (CVP) directions of the array respectively to offset the original coupling signals. A prototype array with the center to center distance of 0.42 <inline-formula><tex-math notation="LaTeX">\lambda_0</tex-math></inline-formula> is fabricated and measured for verification. The isolation between DP array with decoupling structure reaches to 37.5dB and 33.6dB on CHP and CVP at 4.3GHz and envelope correlation coefficient is less than 0.004. The radiation gain of the antenna is almost not distorted while the total efficiency is increased from 84% to 91%. In comparison with other related works, our scheme has high isolation and high total efficiency with smaller space and lower profile.