24 GHz High-Gain Low-Sidelobe Antenna Array Enabled by Chebyshev Synthesis and Superstrate

In this study, we designed a high-gain low-sub-lobe array antenna and used a superstrate layer to increase the gain of the antenna. The Chebyshev method was used to design and realize the low sidelobe characteristics of the antenna. With the help of loading microstrips of four metal cylinders, a high gain was achieved for the antenna unit. The 4×8 array antenna structure was designed using the series feed method and the performance of the array antenna was experimentally verified. The measurement results were consistent with the simulation results. The measurement results showed that the bandwidth of the array antenna was 23.8-24.6 GHz. Since the gain of the array antenna reached 21.9 dBi at 24 GHz, lobe level of the array antenna in the xoz plane was-22 dB, and 3 dB beamwidth of xoz plane was 11.1 • , the proposed antenna array is highly suitable for radar applications.