A Single-Layer Planar Low-Profile Wideband Microstrip Line-Fed Metasurface Antenna

• Published in: IEEE antennas and wireless propagation letters Vol. 20; no. 9; pp. 1641 - 1645
• Main Authors: Ntawangaheza, Jean de Dieu, Sun, Liguo, Li, Yongjie, Biao, Deng, Xie, Zipeng, Rushingabigwi, Gerard
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antennas; Artificial magnetic conductor (AMC); Bandwidths; Boresights; Broadband; Broadband antennas; electromagnetic bandgap (EBG); Frequencies; high-impedance surface (HIS); Impedance; Impedance matching; Local area networks; metasurface (MTS) antenna; Metasurfaces; Microstrip antenna arrays; microstrip line (ML) feed; Microstrip transmission lines; Microwave antenna arrays; Parasitic elements (antennas); Patches (structures); Surface impedance; wideband antenna
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2021.3092016

A single-layer, planar wideband microstrip line (ML) fed metasurface-based antenna operating at 5 GHz wireless local area network band is proposed. It is composed of an array of <inline-formula><tex-math notation="LaTeX">3 \times 3</tex-math></inline-formula> square metal patches fed by an ML connected to the central patch of the three peripheral unit cells. To reduce the phase delay between the driven patch and the parasitic patches placed along the E -plane, a large square slot is cut on the fed patch, while the patches on the second and third rows are sliced into smaller ones to stabilize the patterns at higher frequencies. The large slot also helps achieve better impedance matching. <inline-formula><tex-math notation="LaTeX">{{\bf T}}{{{\bf M}}_{01}}</tex-math></inline-formula> and <inline-formula><tex-math notation="LaTeX">{{\bf T}}{{{\bf M}}_{21}}</tex-math></inline-formula> modes are excited, giving a measured <inline-formula><tex-math notation="LaTeX"> - 10{\boldsymbol{\ }}{{\bf dB}}</tex-math></inline-formula> bandwidth of 26.56% (5.06-6.61 GHz). The compact size of <inline-formula><tex-math notation="LaTeX">1{{\boldsymbol{\lambda }}_0} \times 1.1{{\boldsymbol{\lambda }}_0} \times 0.058{{\boldsymbol{\lambda }}_0}</tex-math></inline-formula> (<inline-formula><tex-math notation="LaTeX">{{\boldsymbol{\lambda }}_0}</tex-math></inline-formula> is the free-space wavelength at the center of the frequency band), stable boresight patterns, low profile, planar configuration, and wide bandwidth features make the presented antenna attractive for various wireless systems.