A Wideband Metasurface Antenna Using Multi-Mode Radiator for Broadband Wireless Communication Applications

A metasurface antenna with wide impedance bandwidth and wide 3 dB gain bandwidth is proposed to broadband wireless communications. The antenna consists of a metasurface with non-uniform cells and a single-aperture-coupling feeding structure. The evolution process is analyzed to elaborate the operating principle of the proposed antenna. By modifying the structure of a conventional metasurface antenna, multi-modes resonance can be achieved to wider the bandwidth. Furthermore, the gain is enhanced in whole impedance bandwidth via etching slots on the patches. Due to the three modes are excited simultaneously, a wide impedance bandwidth and 3 dB gain bandwidth is obtained. A prototype is simulated, analyzed and measured to validate the principle. The results demonstrate that a peak gain of 9.3 dBi is obtained. Moreover, a wide impedance bandwidth over 90% and a wide 3 dB gain bandwidth over 90% is achieved.