请教一个F类放大器谐波控制问题

请问，这个负载网络是怎么实现2次谐波开路3次短路的啊?有PA高手能解答下吗?

这个是英文说明：Figure 1 shows the typical transmission-line inverse ClassF load-network schematic where a shunt 60-degree transmission line TL1 provides low impedance for the third harmonic and certain impedances for the fundamental and second
harmonics at the device drain terminal. The secondharmonic peaking is achieved by using of a 45-degree opencircuit
stub TL3 which creates a low impedance at the end of a series transmission line TL2 at the second harmonic. As a result, the series transmission line with electrical length of less than 45° at the fundamental, combined in parallel with the shunt 60-degree transmission line and device output capacitances Cout, operates as a second-harmonic tank

谐波共振

谐波共振