The filter used for attenuating harmonics on most of Chipcon’s development kits is a Pi-type
(two shunt capacitors, one series inductor) filter. This filter is a 3 dB ripple Chebychev lowpass
LC-filter consisting of L71, C71 and C72. The filter is designed for 50 Ω termination
impedance. The design equations are provided below. The exact values must be found
through measurements to account for parasitic capacitances