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A dual six-port automatic network analyzer incorporating a biphase-bimodulation element

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2 Author(s)
Judah, S.R. ; Dept. of Electron. Eng., Hull Univ., UK ; Wright, A.S.

Current state-of-the-art dual six-port automatic network analyzers (ANAs) are dependent upon mechanical phase shifters and attenuators. Slow measurement and calibration are among the factors that have prevented six-port ANAs from more general use outside standards and research laboratories. Biphase bimodulation, a technique which removes the requirements for mechanical phase shifters or attenuators, is introduced. The technique provides improved sensitivity and elimination of drift as a consequence of AC modulation. A significant increase in measurement speed is achieved, allowing quasi-real-time evaluation of scattering parameters. An experimental prototype dual six-port ANA is described, and results obtained using the technique are given

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:38 ,  Issue: 3 )