A dual-band Doherty power amplifier (DB-DPA) using the extended composite right and left handed transmission lines (E-CRLH TL) is proposed. In this structure the $\lambda /4$ transmission lines are replaced with open-ended E-CRLH TL. The power amplifier exhibits dual-band property at $f_1=2.5\mathrm{G}\mathrm{H}\mathrm{z}$, $f_2=3.4\mathrm{G}\mathrm{H}\mathrm{z}$ input frequencies and suppresses the second harmonics (${2f}_1$, ${2f}_2$) at the amplifier output. The simulation studies show that the second harmonic and second order intermodulation (IM2) of the proposed DB-DPA are improved compare to the conventional DPA. This improvement is obtained because of the quad band property of E-CRLH transmission lines. Then, the proposed DB-DPA is examined using various multi tones signals. The better ACPR and efficiency are achieved compare to the conventional Doherty power amplifiers. The measurement results confirm the accuracy of the simulation results.

提出了一种使用扩展的复合右手和左手传输线（E-CRLH TL）的双频带Doherty功率放大器（DB-DPA）。在这种结构中$\lambda /4$传输线被开放式E-CRLH TL取代。功率放大器在$F_{\mathrm{1个}}=2.5\mathrm{G}\mathrm{H}\mathrm{ž}$， $F_2=3.4\mathrm{G}\mathrm{H}\mathrm{ž}$ 输入频率并抑制二次谐波（${2F}_{\mathrm{1个}}$， ${2F}_2$）在放大器输出端。仿真研究表明，与传统的DPA相比，所提出的DB-DPA的二次谐波和二阶互调（IM2）得到了改善。由于E-CRLH传输线具有四频带特性，因此获得了这种改进。然后，使用各种多音调信号检查提出的DB-DPA。与传统的Doherty功率放大器相比，ACPR和效率更高。测量结果证实了仿真结果的准确性。