Electronic beam-steering design for UWB phased array

A novel electronic beam-steering subsystem providing true time-delay technique has been developed for an ultra-wideband (UWB) phased array. The relative time delay for phase interpolation is variable from 100 to 500 ps. Scanned angles from 9/spl deg/ to 59/spl deg/ were achieved. The chip is designed using 0.25-/spl mu/m CMOS silicon operating at 2.5 V, and its outputs are matched to 50 /spl Omega/ loads using bipolar buffers. The design of the beam-steering architecture will be presented. The measured results of the chip and the UWB phased array, including radiation patterns and pulse-width distortions, will be discussed.