Home > Published Issues > 2022 > Volume 17, No. 8, August 2022 >

Design of a High-Efficiency Doherty Power Amplifier for 5G Applications Using Wilkinson Power Divider

Issoufou G. Gremah Ary 1, George N. Kamucha 2, and Franklin Manene 3
1. Department of Electrical Engineering, Pan African University, Institute for Basic Sciences Technology and Innovation, PAUSTI, Nairobi-6200-00200, Kenya
2. Department of Electrical and Information Engineering, University of Nairobi, Nairobi-00100, Kenya
3. Department of Electrical and Control Engineering, Egerton University, Nakuru-20107, Kenya

Abstract—In this paper, a novel Doherty Power Amplifier DPA based on a 10 W gallium-nitride high-electron-mobility transistor (GaN-HEMT) technology is designed using Advanced Design System (ADS) software. In the design, two different single Power Amplifiers (PAs) are combined using a Wilkinson power divider which is also used to connect the power to the load. The designed DPA operates in the range of 2.0-3.0 GHz and aims to achieve high efficiency, wide bandwidth and high output power for 5G applications. Simulation results showed a 40% fractional bandwidth and more than 44 dBm of saturated output power. In addition, the Power-Added Efficiency (PAE) and Drain-efficiency (Deff) are about 77% and 84%, respectively. A comparison with the other previous works shows enhancement in the maximum large-signal gain (L_S_Gain) in the average of 2.5 dB and an average PAE of about 10%. This improvement can be attributed to the deployment of the power divider/combiner proposed in the design and also the optimization of the components during the design.
Index Terms—Doherty power amplifier (DPA), GaN-HEMT, power divider/combiner, efficiency

Cite: Issoufou G. Gremah Ary, George N. Kamucha, and Franklin Manene, "Design of a High-Efficiency Doherty Power Amplifier for 5G Applications Using Wilkinson Power Divider," Journal of Communications vol. 17, no. 8, pp. 675-681, August 2022. Doi: 10.12720/jcm.17.8.675-681

Copyright © 2022 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.