Design of Low Sidelobe Microstrip Antenna Array with Non-uniform Excitation Amplitude Based on Dolph-Tschebyscheff Synthesis at 28 GHz

The sidelobes in antenna array radiation patterns affect its performance and cause interferences with other communication devices, which degrades the wireless communication. Reduction of the sidelobes level is then inevitable. A variety of methods, such as the Taylor distribution and Dolph-Chebyshev approach, can be employed to lower the sidelobe level (SLL). In this paper, a \(1\times 6\) series fed linear microstrip antenna array based on Chebyshev distribution is designed to reduce the SLL below 26 dB in the E-plane at 28 GHz. Simulation results show a SLL reduction of 12.2 dB (from \(-7.9\) dB to \(-20.1\) dB), a bandwidth of 1.59% and a gain of 14 dB at 28 GHz. This antenna has then the potential to be used in mm-wave 5G applications.