A W band waveguide detector module using zero bias schowttky diode

In this paper, it is aimed to design and realize a broad W-band and high sensitive waveguide detector module using a zero-bias schottky diode. The commercial off-the-shelf GaAs detector diode Aeroflex / Metelics MZBD-9161 is adopted to build a zero-bias direct detector, along with full band antipodal finline transition, microstrip line with DC microstrip blocker and low pass filter. This structure is placed in a gold-plated brass box (input W band waveguide and output SMA female connector) to form a W-band detector module. Voltage sensitivity up to 700 mV/mW from 75 GHz to 110 GHz (full W-band) is achieved. The module is based on microstrip circuit and gold plated brass box and is therefore easy and cheap to fabricate, which satisfies the low-cost requirements of assembling radiometer and millimeter wave imagers.