Quasi-circulator module design using conventional MMIC components in the frequency range (0.1–10 GHz)

This paper presents the design and the measured performances of a quasi-circulator module operating in the 0.1–10 GHz frequency range. The circuit was fabricated using microwave monolithic integrated circuits (mmic) technology with microstrip lines printed on a conventional 100μm thick GaAs substrate. Mainly, the circuit design uses the combination of two active modules: a unilateral out-of-phase divider and a unilateral in-phase combiner. The device presents an insertion loss lower than 9 dB and an isolation greater than 18 dB over the 0.75–7.5 GHz frequency range.