The onboard chip antenna pads and traces dialectrically produce a resonance.
Steps to reproduce
Populate the chip antenna AE5
Attach a vector network analyser
Measure the resonance frequency
Expected result
The chip antenna resonance frequency is 868 MHz.
Actual result
The chip antenna resonance frequency is off by a lot.
Workaround
Once the actual resonance frequency is determined, cut from the trace tail to adjust (increasing the frequency) towards the target frequency.
Alternative
Consider replacing the Johanson 0868AT43A0020E with a more expensive (dual band) Pulse Larsen W3320.
Severity level
This is low priority because project requirements do not mandate antenna calibration.
# Correct chip antenna performance flaw
## Problem environment
The onboard chip antenna pads and traces dialectrically produce a resonance.
## Steps to reproduce
1. Populate the chip antenna AE5
1. Attach a vector network analyser
1. Measure the resonance frequency
## Expected result
The chip antenna resonance frequency is 868 MHz.
## Actual result
The chip antenna resonance frequency is off by a lot.
## Workaround
Once the actual resonance frequency is determined, cut from the trace tail to adjust (increasing the frequency) towards the target frequency.
## Alternative
Consider replacing the Johanson 0868AT43A0020E with a more expensive (dual band) Pulse Larsen W3320.
## Severity level
This is **low priority** because project requirements do not mandate antenna calibration.
Correct chip antenna performance flaw
Problem environment
The onboard chip antenna pads and traces dialectrically produce a resonance.
Steps to reproduce
Expected result
The chip antenna resonance frequency is 868 MHz.
Actual result
The chip antenna resonance frequency is off by a lot.
Workaround
Once the actual resonance frequency is determined, cut from the trace tail to adjust (increasing the frequency) towards the target frequency.
Alternative
Consider replacing the Johanson 0868AT43A0020E with a more expensive (dual band) Pulse Larsen W3320.
Severity level
This is low priority because project requirements do not mandate antenna calibration.