A 200 GHz near field measurement system

S. C. Yang*, C. C. Chin, Shu-I Hu, S. S. Shen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have designed a near field measurement system operating at 200 GHz which has a dynamic range of 60 dB. The system has a short term and long term phase variation less than 0.5° and 2°, respectively. On averaging 128 times at each measurement point by using the averaging function of the network anaylzer, the short term phase variation decreases to less than 0.2°. The phase variation mentioned above is observed with the testing probe pointing to the center of the antenna under test. The contours of the near field obtained shows that the field is highly circular as expected from the theoretical predication. We have shown that the system can distinguish the quality of the corrugated feed horn by near field measurement.

Original languageEnglish
Pages (from-to)2526-2532
Number of pages7
JournalReview of Scientific Instruments
Issue number5
StatePublished - 1 Jan 1999

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