The Performance of GaAs Lumped Element Phase Shifters at S and C Band

The design and performance of an S-band analogue/digital phase shifter GaAs IC chip set, developed for use in a phased array radar transmitter, will be described. The circuits have been used to demonstrate successfully the feasibility of using GaAs IC technology in this application, at a frequency where the more conventional transmission line techniques cannot be used easily due to the large size of the circuit elements. The present circuits rely on the use of lumped components, to minimise the area of GaAs used. The extension of the techniques to higher frequencies (C-band) will also be discussed.