An ultrawideband microwave phase shifter

Abstract

In this paper, we present a new kind of high-frequency analog phase shifter suitable for ultrawide-band operation.Phase tuning is obtained with a local oscillator (LO) producing two coherent phase-shifted signals which are mixed with the incident radio-frequency (RF) signal. Measurements on a prototype exhibit a 20: 1 operational bandwidth.We discuss system design rules and bandwidth limitations. 0 1 2 3 4 5 6 7 Control Voltage in Voit Fig. 5: Wrelative phase shifts vs. control voltage for frequencies ranging from 0.1 GHz to 2 GHz. C w e s have been offset for clarity.