Wideband Four-Port Single-Patch Antenna Based on the Quasi-TM1/2,1/2 Mode for 5G MIMO Access-Point Application

• Published in: IEEE access Vol. 10; pp. 9232 - 9240
• Main Authors: Wong, Kin-Lu, Ye, Xian-Qi, Li, Wei-Yu
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 5G access-point antennas; Antenna arrays; Antennas; Broadband antennas; Correlation coefficients; Four-port single-patch antennas; Metals; MIMO antennas; MIMO communication; modes; Patch antennas; Substrates; TM; TM₁/₂,₁/₂ modes; Wideband
• ISSN: 2169-3536
• DOI: 10.1109/ACCESS.2022.3144231

A wideband four-port single-patch antenna for fifth-generation (5G) MIMO access-point application in 3.3-5.0 GHz (41% centered at 4.15 GHz) is presented. The antenna uses a simple square patch of size 42 mm <inline-formula> <tex-math notation="LaTeX">\times </tex-math></inline-formula> 42 mm (<inline-formula> <tex-math notation="LaTeX">0.58 \boldsymbol {\lambda } \times 0.58 \boldsymbol {\lambda } </tex-math></inline-formula> at 4.15 GHz) mounted 10 mm above a ground plane. To generate four isolated waves in a wide band for MIMO application, the square patch is short-circuited to the ground plane using four simple L-shape metal walls to form four resonant quadrants for the quasi-TM 1/2,1/2 mode excitation. Each resonant quadrant is excited using a slot-coupled probe feed to have dual-resonance behavior with good impedance matching over a wide band. It is obtained that the single-patch antenna can generate four isolated waves in 3.3-5.0 GHz with impedance matching better than −10 dB, port isolation >15 dB, antenna efficiency >80%, and envelope correlation coefficients <0.03. Details of the proposed antenna are presented. An extended design for enhanced port isolation of the proposed antenna is also studied.