Hi!
I must match NRF24L01 to 40+j48 ohm antenna. This is not my design, so no possibility to change. I have PCB antenna, that was measured to be 40+j48 inside enclosure.
So I have some questions:
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Is it correct to assume 15-j88 ohm port (ANT1-ANT2) impedance? Noting that datasheet states best power in 15+j88 load (so taking conjugate).
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Also I can't get 50 ohm impedance at matching network output for reference design, no matter how I calculate it. I've tried to get it looking from side of antenna, calculated all impedances at 2.5GHz, then merged them and got 7.64-j52. Using spice I got 7.4-j51 So the question would be if someone could show how it actually transforms amplifiers 15-j88 to loads 50? Maybe its wrong to substitute port impedance that way, is there some catch?