アンテナ設計
https://blog.braveridge.com/blog/archives/318
2.4GHzの波長λ[mm]=300,000[km/s]/2400[MHz]=125[mm]=12.5[cm]
920MHzの波長λ[mm]=300,000[km/s]/920[MHz]=326[mm]=32.6[cm]
アンテナの長さ λ/4 = 32.6 / 4 = 8.15[cm]
LoRa通信モジュール(E220-900T22S(JP))
https://dragon-torch.tech/cat-components/rf-modules/e220-900t22s-jp/
https://www.flightcoach.org/installation-inside-model/
Library (Supports LLCC68) https://github.com/chandrawi/LoRaRF-Arduino