4-2 1-Port Cable Measurement VNA Measurements
4-4 PN: 10580-00289 Rev. K Vector Network Analyzer MG
After tightening the connector, the insertion loss becomes well behaved, and the mismatch
from the connector is significantly reduced, as shown in Figure 4-2.
The 1-port measurement approach is useful for deployed cables, but does have a practical
limitation. Uncertainties become large as the round-trip cable loss exceeds 15 dB. This
threshold is easy to surpass for long cable lengths or for high operating frequencies. For
longer cables and higher frequencies, a 2-port measurement is required for improved
accuracy.
Figure 4-2. Improved Trace with Connector Tightened
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