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calibrated circular-pol antenna?

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antenna_abc

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Hi, all. I am going to measure a circular-pol antenna, and have a question about the calibration. Where can I find some calibrated circular-pol standard antennas for calibration?

I found some dual-pol antenna, but it requires extra 90 degree coupler to generate circular-polarization. So I am thinking if the mismatching for coupler and antenna increases the uncertainty of measurements?

Or can I use standard linear-pol antenna, and make two-sets of measurements including the theta and phi fields magnitude and phase to calibrate the circular-pol antenna? If so, are there any references about that?

Thanks.
 

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