| 摘要 |
A reflection coefficient phase angle measurement apparatus includes a voltage controlled phase shifter coupled to phase shift a sample of one of the signals incident to and reflected from a waveguide termination. The phase shifted signal sample and a sample of the non-phase shifted signal are phase compared in a phase detector and the sign of the signal resulting from the phase comparison is noted. This sign is compared with the sign of the previous phase comparison to determine a zero crossing. When a zero crossing has not occurred an incrementing signal is added to the phase control signal applied to the voltage controlled phase shifter to alter the phase of the the phase shifted signal sample, and the procedure is repeated until a zero crossing is obtained. The control voltage applied at the zero crossing is established by interpolation and utilized to determine the reflection coefficient phase angle.
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