DC-coupled directional bridge front-end for vector network analyzer receiver in GHz-range

Guus Colman, Johan Bauwelinck, Jan Vandewege
2011 IEICE Electronics Express  
Most of the commercially available vector network analyzers have a high pass cut-off frequency in the higher kHz-range. One of the main reasons is the frequency limitation of the directional device used. In this paper, a simple directional bridge circuit with incorporated frequency conversion stage is presented. This DC-coupled circuit enables vector network analyzer receiver front-ends to work near DC, expanding the frequency range by several decades. The directivity is similar to these of
more » ... ctional bridges used in commercially available analyzers, but this in a frequency range down to DC.
doi:10.1587/elex.8.814 fatcat:samxr54e4jfcrcvm5hgbjm5mwq