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A wideband four-port single-patch antenna for fifth-generation (5G) MIMO access-point application in 3.3-5.0 GHz (41&#x0025; 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<sub>1/2,1/2</sub> 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 &#x2212;10 dB, port isolation &#x003E;15 dB, antenna efficiency &#x003E;80&#x0025;, and envelope correlation coefficients &#x003C;0.03. Details of the proposed antenna are presented. An extended design for enhanced port isolation of the proposed antenna is also studied.

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

Wideband Four-Port Single-Patch Antenna Based on the Quasi-TM_1/2,1/2 Mode for 5G MIMO Access-Point Application