One port complex transmission and group delay measurements

Details One port complex transmission and group delay measurements One port complex transmission and group delay measurements

1996-06-05

1998-06-30

Brown, Glenn W.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324638, 324646, G01R 2732

Patent

active

057739854

ABSTRACT:
An apparatus for characterizing transmission coefficient and group delay for a bi-directional two port device under test (DUT) using only one port of a measurement device, such as a vector network analyzer (VNA). The apparatus in one embodiment includes a programmable switch for coupling to one DUT port to selectively provide an open or a short. The measurement device is controlled to measure a reflection coefficient with the open at the DUT port and another reflection coefficient with a short at the DUT port. The measurement device then calculates a transmission coefficient magnitude value and a transmission coefficient phase angle for the DUT using the open reflection coefficient and the short reflection coefficient measurements. Group delay can then also be calculated using phase angle measurements at different frequencies.

REFERENCES:
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patent: 5434511 (1995-07-01), Adamian et al.
patent: 5467021 (1995-11-01), Adamian et al.
patent: 5548538 (1996-08-01), Grace et al.
patent: 5587934 (1996-12-01), Oldfield et al.
patent: 5642039 (1997-06-01), Bradley et al.

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