Analysis of the third harmonic for class-F power amplifiers with an I V knee effect
Zhao Bo-Chaoa), Lu Yanga), Wei Jia-Xingb), Dong Liangb), Wang Yia), Cao Meng-Yia), Ma Xiao-Huab), Hao Yuea)†
       
Variations of drain efficiency and output power with k without the I – V knee effect.