Microstrip to buried waveguide probe feeds for V- and W-band in LTCC technology

This paper reports on V- and W-band uniplanar probe feeds from microstrip to buried substrate integrated waveguide (SIW) in LTCC technology. For the V- and W-band designs respectively, the measured mid-band insertion loss is 0.24 dB and 0.47 dB with relative bandwidths of 40% and 27 %. The measured average waveguide attenuation is 0.057 dB/mm for V-band and 0.15 dB/mm for W-band. These feeds enable very compact integration of low-loss antenna feed networks, LO distribution networks, etc.