Design of X-band 16-element square helical array antenna fed from radial line

The paper studies an X-band 16-element square helical array antenna. It introduces the background of the rectangular array antenna and the working principle, analyzes coupling characteristics of two kinds of electromagnetic coupling probes in the X-band. A collaborative design of the choke structure and the electromagnetic coupling probe was conducted, the 16-element square helical array antenna with a center frequency of 9.3 GHz was designed and simulated. Simulation results show that: the antenna diameter is 96 mm96 mm, with center frequency 9.3 GHz, the gain is 19.51 dB, the axial ratio is 1.05, the reflection coefficient is less than 0.15.