Two New Six-Port Reflectometers Covering Very Large Bandwidths
Abstract
This paper presents two new structures for six-port reflectometers
with very large operating bandwidths of more than three decades,
using a combination of lumped reflectors and transmission lines.
Circuits working 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 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 difference
between the measured reflection coefficients.
A convenient calibration procedure, for the entire band,
is proposed using three standards and four approximately known loads.
Reference
Jan Hesselbarth, Frank Wiedmann, Bernard Huyart,
"Two new six-port reflectometers covering very large bandwidths,"
IEEE Transactions on Instrumentation and Measurement,
vol. 46, no. 4, pp. 966-969, August 1997.
The complete article is available for download from the
publications page.
Frank Wiedmann
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