I have designed a setup for 433.92MHz wireless device (a key fob). The source impedance is not equal to 50Ohm. The load impedance may or may not be 50Ohm depending upon the choice of the antenna. For now, I have given a block diagram for a setup with a PCB loop antenna below.
Usually, the antenna tuning guides tune the antenna for 50Ohm source impedance. But in this case, the source impedance is not 50Ohm. So, is the tuning procedure same regardless of the source impedance?
Also, I've not done antenna tuning before. Is the antenna tuning setup correct?
Some of the articles I referred:
- Nordic Semiconductor - Antenna Tuning - White Paper
- A stackoverflow question on antenna tuning
- Antenna Tuning for beginners
Suggested matching network design schematic from Atmel Antenna Design Guide.