Abstract: While autoecious feeder with some special functions is installed on the ease-hardened antenna, its structure may be limited strictly and the conventional form could not be satisfied. In this paper, a kind of feeder with single ridge is presented. The ridge is bended and spread step by step, so the impedance matches well. In order to obtain the optimized electrical performance and corresponding structure, the theoretical computations, simulations and experimental modifications are adopted. Thus, the engineering design and application are favorable.