volume | PIER Journals

Abstract

A method for significantly improving the bandwidth of microstrip patch antennas is proposed, utilizing dual-layer metasurface (MS). The antenna employs coaxial probe feeding and consists of a truncated patch, an upper layer of 4 x 4 periodic N-shaped MS and a lower layer of 3×4 rectangular MS. By introducing multiple resonances via the dual-layer MSs, impedance matching of the patch antenna is greatly enhanced. Its overall geometric dimensions are 1.09λ₀ x 1.09λ₀ x 0.14λ₀ (f₀ = 5.5 GHz), and compared with patch antennas and single-layer metasurface antennas of the same size, it can substantially enhance the bandwidth and gain without significant cost and size increase. The proposed MS antenna operates from 4.7 to 6.66 GHz (39.8% fractional bandwidth), covering two-thirds of the C-band, with a peak realized gain of 9.3 dBi. Within 4.47-5.56 GHz, the realized gain of the antenna remains above 7.5 dBi, and the average gain across the entire operating band is 7 dBi.

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Dr. Kangling Yang

Dr. Mingjiang Wang

Dr. Xiao Jia