Distributed transmission line phase shifter using parallel-plate ferroelectric thin film varactors
A distributed transmission line phase shifter based on two series connected parallel-plate ferroelectric thin film varactors, which are integrated into single crystal (100) LaAlO3 (LAO) wafer, is presented. The equivalent circuit model was simulated by the EM simulation software in an effort to optimize the design. A device with differential phase shifts of 150o at 8GHz with a low bias voltage of 12V was realized.
transmission line phase shifters voltage tunable dielectrics parallel-plate varactors microwave measurement