Measure S11/S21 parameters

Problem environment

Antenna resonance is tuned for subgigaherz frequencies, and calibration benefits from S11 and S21 resonance testing.

Steps to reproduce

1. Use a vector network analyser (VNA)
2. Test for reflection in anntenae
3. Measure S11 and S21 parameters

Expected result

The antenna we choose should be well calibrated and include S-parameters for user inspection.

Actual result

We don't offer S-parameters and have not properly tested them.

Severity level

This is low priority because project requirements do not include antenna calibration.

Separated into separate tickets #141(S11) and #142(S21) and closed as duplicate.