A Compact Dual-Band Patch Antenna Based on SISL for 5G Application

A dual-band patch antenna using substrate integrated suspended line (SISL) technology is presented in this paper. The presented antenna has a small size of 0.6$\lambda_{\mathbf{0}}* 0.62\lambda _{\mathbf{0}}(\lambda_{\mathbf{0}}$, the wavelength in free space of the lower operating frequency). The antenna consists of four parts: a feeding line, a metal strip, a driven patch, and a stacked patch. Specifically, the driven patch is excited by the feeding line to generate the lower frequency resonance mode and the upper one is created by the stacked patch. The bandwidth is 3.18-3.63 GHz and 4.78-5.04 GHz which is significantly improved by adding a metal strip. For the lower and upper band, the maximum gain is 7.6 dBi and 8.6 dBi based on the all FR4 substrates. Besides, the radiation efficiency is higher than 92% within the passband.