A low-cost 20-22 GHz MIC active receiver/radiometer Academic Article uri icon

abstract

  • A microwave integrated circuit active receiver is built and tested at 19-25 GHz. The receiver consists of a planar CPW-fed double folded-slot antenna coupled to a six-stage MESFET amplifier and followed by a planar Schottky-diode detector. The folded-slot antenna on a GaAs half-space results in a wide frequency bandwidth suitable for MMIC amplifiers. The measured system performance show a video responsivity close to 1 GV/W at 20 GHz with a 3-dB bandwidth of 1500 MHz. A novel method which uses the planar video detector after the amplifier stages as an RF mixer is used to measure the noise-figure of the direct detection radiometer. The system noise figure is 4.8 dB at 22 GHz. The radiometer sensitivity to a hot/cold load is 3.8 /spl mu/V/K. The measured antenna patterns show a 90% Gaussicity at 20-22 GHz. The active MIC receiver can be integrated monolithically for low-cost applications and is well suited for millimeter-wave linear imaging arrays.<>

published proceedings

  • IEEE Transactions on Microwave Theory and Techniques

author list (cited authors)

  • Mollenkopf, S., Katehi, L., & Rebeiz, G. M.

citation count

  • 8

complete list of authors

  • Mollenkopf, S||Katehi, LPB||Rebeiz, GM

publication date

  • April 1995