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Antennas and impedance matching
Marc Juul edited this page Sep 4, 2018
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Make sure you know the basics of electricity and Ohm's law. You can learn this from the first chapters of the book Practical Electronics For Inventors.
Watch the following videos:
- How antennas work
- Basic antenna info for LoRa
- Tweaking resonant frequency with a VNA for LoRa
- Tutorial: Electrical impedance made easy part 1
- Tutorial: Electrical impedance made easy part 2
Read the first page of chapter 2 on resonant circuits then chapter 4 on Impedance matching in the book RF Circuit Design. You might want to read chapter 3 on Filter Design as well as the rest of chapter 2.
- 137 MHz to 3.5 GHz
- Two ports (but only one port capable of transmitting)
- $293 with calibration kit
- Fully open source and open hardware!
- Website
- 140 MHz to 2.7 GHz
- Only one port (so not a true VNA)
- Integrated unit with display
- $150 from aliexpress
- Video review
This unit has great reviews. Performance similar to professional equipment.
- 500 kHz to 4 GHz
- Two ports
- $482 new from ebay
- Software is CC BY-ND-NC and no source code but runs on linux
Plus version seems to be the same but in a metal case.
- 500 kHz to 4 GHz
- Two Ports
- $490 from official website
- Closed source with open API
- Website
- 0.1 to 230 MHz only (so not usable for us)
- Integrated unit with display
- $360 from seeed studio
- SDK is open source but not sure what that covers
- Website