A Shared-Aperture Dual-Band Antenna Design with Low Profile

A novel shared-aperture dual-band antenna is presented in this paper. Based on the metasurface with fractal geometry, dual-band radiation capabilities are realized with slot-coupling feedings. Because the high-band elements are nested inside the low-band radiator in this design, more compact volume is achieved compared with separated or stacked placement. The -10 dB impedance bandwidth of the lower and upper bands are 4.9-5.6 GHz and 7.4-10.2 GHz, respectively. Good isolations between the ports of two bands are obtained, which are better than -20 dB across the total band.