Calibrating Dual-Directional Couplers and Evaluating Uncertainties in Net Power Delivery

Abstract:

Dual-directional couplers are used to monitor net power fed into transmitting antennas in standard-field systems at NIM, China. It is essential to calibrate the coupler and evaluate the measurement uncertainty in the net power in such applications. The method we use at NIM to calibrate couplers are presented in this paper, and a complete model that takes into account the measurement uncertainties of couplers and horns to evaluate uncertainties in net power delivery is proposed. A case study is also provided of power delivery by a coupler with the nominal directivity of 40 dB using the Monte Carlo analysis based on the complete model and actual measured data.

• Periodical: Advanced Materials Research (Volumes 718-720)
• Pages: 1446-1450
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.718-720.1446
• Online since: July 2013
• Authors: Jin Yuan Li, Ming Xie
• Keywords: Calibration, Dual-Directional Coupler, Uncertainty

References

[1] IEEE Std 1309: IEEE Standard for Calibration of Electromagnetic Field Sensors and Probes, Excluding Antennas, from 9 kHz to 40 GHz. (2005)

DOI: 10.1109/ieeestd.2005.98650

[2] Z. Chen, D. Lewis, Evaluating Uncertainties in Net Power Delivery using Dual Directional Couplers, Proc. IEEE International Symposium on Electromagnetic Compatibility, 2005, pp.782-786.

DOI: 10.1109/isemc.2005.1513630

[3] M. Kanda, R.D. Orr, A radio-frequency power delivery system: Procedures for error analysis and self-calibration, NBS Technical Note 1083, U.S. Department of Commerce/National Bureau of Standards.

DOI: 10.6028/nbs.tn.1083

[4] X. Jiao, et al, Report on the establishment of 1-18 GHz power density standard, NIM report, 2008. (in Chinese)