Standing Wave Ratio, Phase, Delay, Smith Chart with 2.8inch Touch Screen. The VNA Smith Chart display should be calibrated and coordinates. Model Your Measurements with Circuit Simulators. SEESII 10KHz-1500MHz Vector Network Analyzer Kit MF HF VHF UHF Antenna Analyzer. Calibrate the network analyzer for 1 port reflection measurement S11, at the. A negative reactive component would indicate a capacitive load but a negative resistive component should not be possible. For example, choose between a Smith chart or VSWR or group delay representation.
Connecting this to the VNA results in a negative resistance reading off of the smith chart plot.
I then remove the 50Ohm load and connect the antenna to the antenna feed line using a 0Ohm resistor (as shown below). When I perform the calibrations, the open, short and load is plotted on the smith chart in the expected location (open plotted on the right, short plotted on the left, load potted in the centre). Load, using a 50Ohm resistor, solder the 50Ohm load between the antenna feed line and ground.Short, using a 0Ohm resistor, connect the antenna feed line to ground.Open, connect the 50Ohm cable, soldered to the PCB to the VNA and disconnect the antenna from the 50Ohm cable.The method for calibrating is as follows: I perform a 1-port calibration, doing an Open, Short and Load calibration. I am using the Siglent SSA3032A-R spectrum analyser which has a Vector Network Analyser (VNA).īefore measuring the impedance of an antenna under test so that I can match this antenna, I have to calibrate the VNA.
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