A Review of Ku-Band GaN HEMT Power Amplifiers Development.

Area of Science:

• Electrical Engineering
• Materials Science
• Microwave Engineering

Background:

• Ku-band high-power amplifiers (HPAs) are essential for satellite communications, UAVs, and military radar.
• Growing demand for high-frequency, high-power amplification is driven by global data communication expansion and national security needs.

Purpose of the Study:

• To review the current status and advancements in Ku-band Gallium Nitride (GaN) High-Electron Mobility Transistor (HEMT) HPAs.
• To compare different GaN HEMT process technologies and HPA categories (MMICs vs. IM-PAMs).
• To explore design topologies, critical issues, and thermal management techniques for Ku-band HPAs.

Main Methods:

• Literature review of GaN HEMT process technologies for Ku-band HPAs.
• Categorization and comparison of Monolithic Microwave Integrated Circuits (MMICs) and Internally Matched Power Amplifier Modules (IM-PAMs).
• Analysis of design topologies, oscillation prevention, bias circuits, and thermal management.

Main Results:

• Silicon carbide (SiC) substrates with 0.25 μm and 0.15 μm gate lengths are predominant.
• MMICs and IM-PAMs can achieve up to 100 W output power and 30% power-added efficiency.
• MMIC power amplifier performance is advancing faster than IM-PAMs, indicating higher future potential.

Conclusions:

• MMICs represent a promising direction for future Ku-band HPA development due to enhanced efficiency and integration.
• This review provides key insights into technologies for Ku-band GaN HPA design and future research directions.
• Continued advancements in GaN HEMT technology are crucial for meeting the increasing demands in high-frequency communication and radar systems.