A Novel Metasurface for Dual-Mode and Dual-Band Flat High-Gain Antenna Application

A dual-mode and dual-band flat high-gain antenna based on anisotropic focusing metasurface (MS) is proposed in this communication. The elements of the MS can steer the reflected phases of y-polarized waves around 10 GHz and the transmitted phases of x-polarized waves around 14 GHz independently. The function of the anisotropic MS is to focus the incident plane waves around 10 and 14 GHz on spots with different focal lengths and spaces. To reduce the block effect of the reflection mode, an extra phase gradient is introduced to the initial phase distribution of the y-polarization to deflect the reflection mode main-beam to an angle of 30°. Finally, the new high-gain antenna obtains a deflecting reflection beam with peak gain of 17.2 dB and a normal transmission beam with peak gain of 19.5 dB. Besides single-band working, the antenna can also operate at 10 and 14 GHz simultaneously with gains of 14.7 and 16.7 dB, respectively. Measured results make a good agreement with the simulated results.