“…[1][2][3] Multitudinous of linear technologies are well-developed, such as Doherty technology, pre-distortion technologies, feedback or feedforward technologies and so on. [3][4][5] However, methods involve feed controlling or digital processing will face enormous difficulties with the operating frequency and bandwidth increasing. 6,7 By enhancing the performance at output power back off areas, the linear Doherty shows a tremendous linearity with high efficiency when operating at a narrow band, nevertheless, even though latest reported novel Doherty could break the limitation of λ/4 impedance transformer to achieve broader bandwidth, however, the bandwidth and linearity is hard to maintain simultaneously.…”