Design of a Ku band 7-bit PIN diode phase shifter

A Ku band 7-bit PIN diode phase shifter is presented in this paper. Developed switched-line with loaded-line circuits [1,2] and reflective-type with loaded-line circuits are employed to extend the band width and achieve good phase shifting characteristics. Adopting more composition bits and adding open stubs to each bit as tuning elements help the phase shifter achieve finer phase control and easier tuning. The phase shift accuracy is ±2.5°, the insertion loss of 128 phase states is not greater than 6.5dB over 14–14.5GHz while the VSWRs are less than 1.45, and the amplitude imbalance is lower than 0.8dB.