Waveguide-hologram-based wavelength-multiplexed pseudoanalog true-time-delay module for wideband phased-array antennas

A pseudoanalog true-time-delay (TTD) module based on substrate-guided waves and wavelength-division multiplexing is presented. A 1-to-32 (5-bit) even fan-out is demonstrated by use of a two-dimensional waveguide hologram arra y. This module has a packing density of 2.5 lines/cm(2) and very compact pa ckaging (8 cm x 4 cm x 8 mm). It also reduces TTD system complexity by prov iding continuously tuned delay signals to parallel-control the whole phased -array antenna system. The device has a measured bandwidth of as high as 2. 4 THz. The delay signal can range from tens of picoseconds to several nanos econds. (C) 1999 Optical Society of America.