Abstract
This article proposes a modified load modulation network (LMN) to adjust the structure of the traditional Doherty power amplifier (DPA) by changing one λ/4 microstrip line at the output of the main power amplifier into two in the traditional DPA and connecting a terminal open-circuit λ/2 line at the junction point which can reduce the frequency dispersion effect to achieve expanding bandwidth while maintaining saturation efficiency and back-off efficiency. A 2.6–3.6 GHz DPA is designed and fabricated for verification. The measured results show that the saturated output power is 42.5–44 dBm and the saturated efficiency is between 63% and 69% in target band with a gain from 8.5 to 9.5 dB. At 6 dB output power back-off, the drain efficiency is 44%–50%. And the adjacent channel power ratio (ACPR) is better than −32 dBc.
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