Research on a 0°∼360° FET analog phase shifter of x-band

In this paper, the design of the 0°~360° FET analog phase shifter is presented. By changing the gate voltages of the FET transistors, the output amplitudes of the four orthometric vector signals of the phase shifter can be independently adjusted. In this way, any phase shift over the range of 0° to 360° can be achieved. Due to the amplification characteristic of the FET transistors, the designed phase shifter has a gain rather than insertion loss. The gate voltages of the FETs are controlled by a microcontroller. Within the bandwidth of 400MHz (9.8GHz~10.2GHz), the designed and fabricated 0°~360° phase shifter´s input and output VSWRs are less than 2:1, the phase error is less then ±3°, and the in-band gain is about 7±0.5dB.