Is there hardware reference desing rules or recommendations for RF design?
I'm especially interested in antenna network impedance matching recommendations/example, cause in the chinese hardware design guide there are few recommendations:
BL70X The RF pin input impedance is approximately 25 Ohm, it is recommended to reserve a matching network in the circuit design, mainly for impedance matching and stray harmonic suppression, it is recommended to use Pi type (CLC) Matching network structure, the specific network component parameters need to be based on the actual antenna design and PCB. The impedance characteristics are debugged.
- When debugging the impedance matching network, it is necessary to make the load impedance of the chip port as about 25 ohms, and try to ensure that the load impedance is in the capacitive region.
- In circuit design, it is recommended to reserve a fifth-order matching network to ensure the harmonic suppression effect.
PS: I'm planing to use chip antenna.