Cohn topology-based 1:8 power divider for S-band array antenna feeding network

In this paper, a design of 1:8 power divider is proposed for S-band array antenna feeding network. The proposed power divider which is designed based on Cohn topology is implemented on an RO4003C dielectric substrate which has the relative permittivity and the thickness of 3.55 and 1.524mm, respectively. Seven pairs of 1:2 power divider are used to construct the design of 1:8 power divider. Some parameters such as insertion, isolation and voltage standing wave ratio (VSWR) are used to analyze the performance of power divider in the frequency range of 2–4GHz. The result shows that the 1: 2 power divider has the values of insertion loss, isolation and VSWR of greater than 3.08dB, greater than 24dB, and less than 1.1, respectively. Meanwhile, the 1:8 power divider has the insertion value of greater than 9.26dB, isolation value of greater than 23dB, and VSWR value of less than 1.5. The characterization result has shown an adequate performance for S-band array antenna feeding network of radar system.