Abstract :
In the field of microwave metrology, interest continues to focus on the dual six-port automatic network analyzer, and refinements of it. While the technique is demonstrably capable of unprecedented accuracy, the realization of this performance potential requires a signal source which is both "cleaner" (free from harmonics, etc.) and of higher power (by 10-20 dB.) than required by other network analyzers. In addition, and for the most part, the existing six-port systems fail to provide a real time display, although some interesting results in this area have been reported in England.
