2 NEW 6-PORT REFLECTOMETERS COVERING VERY LARGE BANDWIDTHS

This paper presents two new structures for six-port reflectometers wit h very large operating bandwidths of more than three decades, using a combination of lumped reflectors and transmission lines, Circuits work ing over a range of 2 MHz to 1300 MHz and 2 MHz to 2200 MHz have been built using inexpensive passive surface mount elements and Schottky de tector diodes, Comparing results obtained from the new proposed struct ures with those obtained from a commercial network analyzer showed a w orst case absolute value of 0.020 for the complex difference between t he measured reflection coefficients, A convenient calibration procedur e, for the entire band, is proposed using three standards and four app roximately known loads.