Single-Substrate Transmissive Antenna Radiating Arbitrary Symmetric Multibeams Based on Coding Metasurface

In this letter, an approach to designing the symmetric multibeam metasurface (MS) based on 1-bit coding sequences is put forward and its effectiveness is verified. Also, a single-substrate element with the transmissive coefficient of −0.63 dB is designed to reduce the profile and improve the gain. Moreover, the amplitude and the phase of the element could be regulated independently so that the element could be employed to suppress the sidelobe level (SLL). Finally, based on the proposed approach and the element, a low SLL transmissive dual-beam antenna employing a single-substrate coding MSs is constructed. The measured result shows that, at 15 GHz, the antenna has a gain of 15.9 dBi and SLL of −16.9 dB. The −1.5 dB gain bandwidth of the antenna is from 14.78 to 18 GHz.