Antenna Design and NanoVNA: Difference between revisions
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NanoVNA draws the measurement result on the screen as a graph of the | NanoVNA draws the measurement result on the screen as a graph of the | ||
measured quantity versus frequency or on the [https://en.wikipedia.org/wiki/Smith_chart Smith Chart]. | measured quantity versus frequency or on the [https://en.wikipedia.org/wiki/Smith_chart Smith Chart]. | ||
M1: Marker position | |||
Before each measurement: | |||
* which traces we want to display (up to four or three plus Smith Chart) | |||
** DISPLAY -> CHANNEL -> CH0 Reflect for antennas. | |||
* trace channel (CH0 REFLECT or CH1 THROUGH) for each trace separately | |||
** DISPLAY -> TRACE. Click multiple times. | |||
** Active Trace. | |||
* trace format (unit of measurement of each format) | |||
* scale (how many units of measurement per each horizontal line, for each trace separately) | |||
* reference position for each trace separately | |||
* sweep frequency (stimulus frequency range) | |||
* calibrate the NanoVNA | |||
Revision as of 10:19, 18 June 2024
Introduction
NanoVNA is a simple but powerful tool to analyze antennas.
VNA: Vector Network Analyzer
SWR: Standing Wave Ratio measures the degree of mismatch between a transmission line and its load. SWR is a measure of what is happening to the forward and reflected voltage waveforms and how they compare in size.
Theory
Calibration
NanoVNA should be calibrated
Antenna Measurements
Use Port 1 when measuring one port devices.
NanoVNA draws the measurement result on the screen as a graph of the measured quantity versus frequency or on the Smith Chart.
M1: Marker position
Before each measurement:
- which traces we want to display (up to four or three plus Smith Chart)
- DISPLAY -> CHANNEL -> CH0 Reflect for antennas.
- trace channel (CH0 REFLECT or CH1 THROUGH) for each trace separately
- DISPLAY -> TRACE. Click multiple times.
- Active Trace.
- trace format (unit of measurement of each format)
- scale (how many units of measurement per each horizontal line, for each trace separately)
- reference position for each trace separately
- sweep frequency (stimulus frequency range)
- calibrate the NanoVNA
