Coding Metasurface Integrated Dual-Band Antenna for Vehicular Communications

This paper presents an ultracompact dual-band vehicular antenna for simultaneous satellite, terrestrial and in-car communications. The antenna consists of 16 dual-band units and a double layer coding metasurface (CMS) which can transmit and reflect electromagnetic (EM) waves in the sub-6 GHz and X-band, respectively. The CMS is located underneath the antenna array, which is not only used as the reflector to increase gain and to transform the polarization for the higher frequency band, but also acts as a bandpass lens to realize the beam-forming for the lower frequency band. The proposed antenna has a very low profile (8.5 mm) and the bandwidth is sufficiently large to meet the need of vehicular communications. The simulated and measured results show that the -10 dB impedance bandwidth is from 5.58 to 5.85 GHz for the lower band and is from 9.79 to 10.09 GHz for the higher band. The maximum gain at 9.88 GHz (for satellite), at 5.73 GHz (for terrestrial) and at 5.83 GHz (for in-car) are more than 19.54 dBic., 14.03 dBi and 5.35 dBi, respectively.