Design of integrated differential balun circuits

Abstract

In this paper, a practical 50–100 Ω balun, based on the principle of transformers, was designed and fabricated, which was printed on the copper cladded FR4 PCB. First, a full wave model of the balun was designed using ADS; then, the fabricated structure was measured for the insertion loss, phase difference, and amplitude imbalance. It is found the designed balun is excellently in agreement with the simulation results.