A 90–100 Ghz 4×4 sige BiCMOS polarimetric transmit-receive phased array with simultaneous receive-beams capabilities

Abstract

This paper presents a 4×4 transmit/receive SiGe BiCMOS phased array at 90-100 GHz with vertical and horizontal polarization capabilities, and 3-bit amplitude and 4-bit phase control. The 4×4 phased array fits into a 1.6×1.5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> grid, which is required at 94 GHz for wide scan-angle designs. This is accomplished using dual-nested 16:1 Wilkinson combiners/divider with > 40 dB isolation between the dual-receive beams. Measurements show ±0.6 dB and ±0.75 dB variation between the array elements in the transmit (P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sat</sub> ) and receive mode, and <; -40 dB coupling between the elements for transmit, receive and dual-receive modes. The application areas are in W-band radar systems.