Hesselbarth Et Al.: Two New Six-port Reflectometers Covering Very Large Bandwidths 1 Two New Six-port Reeectometers Covering Very Large Bandwidths

1 Two New Six-Port Re ectometers Covering Very Large Bandwidths Jan Hesselbarth, Frank Wiedmann, and Bernard Huyart, Member, IEEE Abstract|This paper presents two new structures for sixport re ectometers with very large operating bandwidths of more than three decades, using a combination of lumped re ectors and transmission lines. Circuits working over a range of 2 MHz to 1 300 MHz and 2 MHz to 2 200 MHz have been built using inexpensive passive surface mount elements and Schottky detector diodes. Comparing results obtained from the new proposed structures with those obtained from a commercial network analyzer showed a worst case absolute value of 0.020 for the complex di erence between the measured re ection coe cients. A convenient calibration procedure, for the entire band, is proposed using three standards and four approximately known loads. Keywords| six-port re ectometer, re ection coe cient measurement, network analysis, large bandwidth, calibration procedure, diode detector linearization, temperature correction