SWRA640H December 2018 – May 2024 CC1310 , CC1312R , CC1314R10 , CC1350 , CC1352P , CC1352R , CC1354P10 , CC1354R10 , CC2620 , CC2630 , CC2640 , CC2640R2F , CC2640R2F-Q1 , CC2642R , CC2642R-Q1 , CC2650 , CC2652P , CC2652R , CC2652R7 , CC2652RB , CC2652RSIP , CC2674P10 , CC2674R10
An LC filter is placed between the balun and the antenna. The filter has two functions: attenuate harmonics and perform an impedance transformation to 50Ω. The latter is important since measuring equipment, such as spectrum analyzers and RF signal generators, have a port impedance of 50Ω. The word "filter balun" is sometimes used to describe all the components necessary to implement a balun, filter and to ensure proper impedance matching between the radio and the antenna.