Research And Design Of Broadband High Gain Microstrip Antenna Loaded With Metasurface

With the rapid development of Wi-Fi and 5G technology,the demand for broadband,high gain,low profile and miniaturization antennas is increasingly urgent.Metamaterials and their two-dimensional metasurface can arbitrarily regulate the amplitude,phase and polarization of the incident electromagnetic wave.Therefore,the design of high-performance antennas assisted by the metasurface has important significance and practical value.Firstly,A WLAN antenna via loading with a metasurface is designed.On the basis of the rectangular patch antenna,a dual-band WLAN slotting antenna is realized;and a double negative metasurface corresponding to the working frequency band is further loaded to increase the gain of the antenna and improve its impedance matching level.The designed antenna has working bandwidths of 2.27GHz?3.45GHz and 5.32GHz?6.26GHz,the relative bandwidths of 41.2%and 16.2%,maximum gain of 8.6dB,at 2.4GHz and 5.8GHz.Compared with the antenna without loading the metasurface,the gain of the antenna is increased by 10.1dB and 5.7dB,respectively.Compared with similar antennas,it has the advantage of high gain.Secondly,two metasurface antennas for Sub-6GHz frequency band are designed.The target frequency is achieved by embedding a circular ring in the center of the WLAN antenna,and a gradual feeding structure is designed to broaden the bandwidth.The designed antenna working bandwidth is 3.08GHz?5.18GHz,the relative bandwidth is 50.8%,and the maximum gain is 3.6dB.Secondly,by studying the influence mechanism of the metasurface on the antenna performance,a square double negative metasurface was designed to increase the maximum gain of the antenna to 9.84dB in the 4.28GHz?5.14GHz frequency band.Further by changing the arrangement of the square double negative metasurface structure And the array method,a multi-frequency double-negative metasurface is obtained,which is loaded at 0.5mm behind the antenna backplane,so that the working bandwidth of the antenna is 3.02GHz?6.49GHz,and the relative bandwidths are 73%,which are 22.2%wider than the antenna without a metasurface,and the maximum gain is 5.8dB.The size of the metasurface antenna is 70mm × 70mm × 4.1mm,and the profile height is only 0.04 ?(? of the lowest operating frequency point Wavelength).Compared with similar antennas,the above two metasurface antennas have the advantages of high gain and broadband low profile respectively.The high-performance antenna assisted by the metasurface has the advantages of compact structure,wide-band,low profile,high gain and low cost.It provides the high-quality antenna design solutions for indoor communication systems and broadband wireless communications.