Feed network of 66-element triangle-grid radial-line array antenna

Multi-unit radial-line sub-array can be used to reduce cascade of array feed network, thus contributing to reducing the loss of the whole feed network, and triangle-grid arrangement can reduce the number of antenna units so as to reduce the cost effectively. Therefore, the design idea of multi-unit triangle-grid radial-line sub-array is proposed. Based on the required coupling amount of feed network, a new coupling probe is designed, and moreover a 66-element triangle-grid radial-line feed network at the center frequency of 2.856 GHz is designed. Simulation results show that, this feed network basically achieves an equal amplitude of 66 units coupling coefficient, and in the frequency band from 2.78 GHz to 2.92 GHz, the reflection coefficient is lower than 0.1. In addition, simulation on the radiation characteristics of the feed network which is loaded with the antenna units is carried out, which further verifies the feasibility of the design.