Measurement Method of Amplitude Ratios and Phase Differences Based on Power Detection Among Multiple Ports

A method of measuring the amplitude ratios and phase differences among the same RF output signals from multiple ports at the same frequency is proposed. A power-combining module is used to couple multiple signals vectorially from the ports. In the proposed method, the amplitude ratios among the RF s...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2019-12, Vol.68 (12), p.4615-4617
Main Authors: Choi, Ui-Gyu, Kim, Ho-Yeon, Han, Seong-Tae, Yang, Jong-Ryul
Format: Article
Language:English
Subjects:
Amplitude ratio measurement
Amplitudes
Frequency measurement
Impedance
Impedance measurement
impedance mismatch compensation
Measurement uncertainty
Modules
multiple ports
Network analysers
Parameters
Passive components
phase difference measurement
Phase measurement
Ports
power detection
Power measurement
power-combining module
Production planning
Scattering parameters
Teleconferencing
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A method of measuring the amplitude ratios and phase differences among the same RF output signals from multiple ports at the same frequency is proposed. A power-combining module is used to couple multiple signals vectorially from the ports. In the proposed method, the amplitude ratios among the RF signals from multiple ports are calculated using the output power of the module to which only one port is connected, and using the S-parameters of the module itself. However, the phase differences among multiple ports cannot be simply represented by the differences between the output power of the module and the ideally combined power, because the impedances of all ports except measuring ports should be perfectly matched. The proposed method uses a parameter that compensates for the impedance mismatches generated at the other ports to achieve precise measurement of the phase differences among multiple ports. The measurement results using the passive component with three ports reveal that the mean errors of the proposed method are 1.26% and 2.15° in the amplitude and phase, respectively, when compared with measurements using the vector network analyzer. The standard deviations of the errors show 1.68% and 1.67° in the amplitude and phase, respectively.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2019.2943976