Design of a Doherty Power Amplifier with GaN Technology in the Sub-6 GHz Band for 5G Applications with Harmonic Suppression

Highly Efficient GaN Doherty Power Amplifier for N78 Sub-6 GHz Band 5G Applications

“…This power divider equally splits the input power (port 1) into two equal-phase output signals (port 2 and port 3), maintaining matched states and offering isolation between the output ports. The formulas below demonstrate how to calculate the Wilkinson power divider parameters [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]:…”

“…Both amplifiers employ an output combiner with quarter-wavelength transmission lines, providing a 90-degree phase shift and contributing to load modulation. This modulation adjusts the impedance presented to the PA's output, varying with the current from the other device, as seen in Figure 6 [29]. When the input power is low (in back-off conditions), only the carrier PA is active and the impedance presented to the peaking PA (𝑍 ) will be ∞.…”

“…Both amplifiers employ an output combiner with quarter-wavelength transmission lines, providing a 90-degree phase shift and contributing to load modulation. This modulation adjusts the impedance presented to the PA's output, varying with the current from the other device, as seen in Figure 6 [29].…”

An Overview of RF and Microwave Research in Latin America: Scanning Latin American Research on Microwaves

“…The most active researchers on RF and microwaves in this country are at the Pontifical Catholic University of Peru [116], [117], in Lima, at the Catholic University San Pablo [118]- [120], in Arequipa, and at the National University of Saint Agustin [121], [122], also in Arequipa. Their research mainly focuses on microwave transistor modeling [121], power amplifiers [122], radar imagining and sensing [116], [117], as well as in antennas [118] and microwave sensors for materials characterization [119], [120] and cancer detection [123]. The second edition of the IEEE MTT-S Latin America Microwave Conference (LAMC) took place in Peru, at the Catholic University San Pablo, in December 2018 [124]; Figure 9 illustrates some of the microwave laboratory resources at this university.…”