Ultra-Wideband Power Amplifier Design Strategy for 5G Sub-6-GHz Applications.

Area of Science:

• Electrical Engineering
• RF and Microwave Engineering

Background:

• Ultrawideband (UWB) power amplifiers are crucial for high-data-rate wireless communication systems.
• Achieving high efficiency and output power over a wide bandwidth remains a significant design challenge.

Purpose of the Study:

• To present a novel strategy for designing ultrawideband power amplifiers with approximately 200% fractional bandwidth.
• To demonstrate the effectiveness of the proposed design through practical implementation and characterization.

Main Methods:

• Utilizing a simple output matching network comprising a series transmission line and a shunt stub to counteract device parasitic effects.
• Implementing a multisection transformer to achieve optimal load impedance at the intrinsic drain plane.
• Designing and fabricating output matching networks for Gallium Nitride High Electron Mobility Transistor (GaN HEMT) devices.

Main Results:

• The designed amplifier achieved a drain efficiency ranging from 52% to 70%.
• Output power levels between 40 dBm and 42.5 dBm were recorded.
• The amplifier operated effectively over 67% of the 5G sub-6-GHz band (0.1 to 4 GHz).

Conclusions:

• The proposed design strategy enables state-of-the-art performance in ultrawideband power amplifiers.
• The implemented matching network effectively compensates for device parasitics and achieves optimal loading.
• This work contributes significantly to the advancement of broadband power amplifier technology for future wireless systems.