User's Manual

DE910 Series Hardware User Guide
1vv0300951 Rev.9 – 2015-05-11
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Reserved. Page 38 of 77
6.1.2.1.1.2. Transmission line measurements
HP8753E VNA (Full-2-port calibration) has been used in this measurement session. A
calibrated coaxial cable has been soldered at the pad corresponding to RF output; a
SMA connector has been soldered to the board in order to characterize the losses of the
transmission line including the connector itself. During Return Loss / impedance
measurements, the transmission line has been terminated to 50 Ω load.
Return Loss plot of line under test is shown below:
Line input impedance (in Smith Chart format, once the line has been terminated to 50 Ω
load) is shown in the following figure: