A dual-varactor, analog phase shifter operating 6 to 18 GHz

摘要

A monolithic microwave integrated circuit (MMIC) analog reflection phase shifter is described that achieves 120 degrees of phase shift from 6 to 18 GHz using a dual-varactor reflection circuit. This circuit allows varactors with a 3:1 capacitance ratio to achieve the performance that normally requires 10:1 ratio diodes. The varactor diode used is a surface-oriented structure with a hyperabrupt doping profile selectively ion implanted to a depth of 0.70 mu m. Measured phase shift was typically 0 to 150+or-20 degrees with 2.7 dB typical insertion loss (4.0 dB worst case) for one coupler section over 6 to 18 GHz.