There is some doubt about the nRF2401L+ RF matching circuit.From the article of <<Tuning_the_nFR24xx_matching_network.pdf>> ,it says "The balun-function is done by the 180°phase shift in L1",I can not understand why only one inductor can achieve the balun-function.I used ADS2011(Advanced Design System 2011) to simulat,I can not get the 180°phase shift only use one inductor.Normally, i often use two inductors and two capacitors to achieve the balun-function which is the 180°phase shift.In nRF2401L+ there is a balun being integrated,is right?or can you share the theory of using only one inductor to achieve the balun-function?problem.jpg
