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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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6-18 GHz High-Efficiency Power Amplifier MMIC Based on Broadband Impedance Matching.

Shuai Liu^1,2, Xiaohua Ma¹, Yi Zhang²

¹School of Microelectronics, Xidian University, Xi'an 710071, China.

|June 26, 2026

Summary

A new gallium nitride high-electron mobility transistor (GaN HEMT) power amplifier was developed for broadband applications. This high-efficiency monolithic microwave integrated circuit (MMIC) achieves over 43.5 dBm power and 30% PAE.

Keywords:

Chebyshev matching network broadband power amplifier high efficiency power amplifier

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Area of Science:

Electronics
Materials Science
Electrical Engineering

Background:

Modern communication systems demand high-efficiency, broadband power amplifiers.
Gallium Nitride (GaN) High-Electron Mobility Transistors (HEMTs) offer superior performance for these applications.
Existing MMIC power amplifiers face challenges in achieving both high efficiency and wide bandwidth.

Purpose of the Study:

To design and develop a high-efficiency, broadband monolithic microwave integrated circuit (MMIC) power amplifier.
To meet the stringent requirements of modern communication technology.
To explore advanced design techniques for enhanced performance.

Main Methods:

Utilized a 0.25 μm GaN HEMT process for fabrication.
Employed a multistage Chebyshev-filter-based matching approach for bandwidth and harmonic control.
Implemented a multi-cell combining architecture in the final power stage for high output power.

Main Results:

Achieved a saturated output power exceeding 43.5 dBm.
Reached a Power Added Efficiency (PAE) of over 30%.
The designed GaN amplifier has a compact area of 4 × 3.2 mm².

Conclusions:

The developed GaN MMIC power amplifier demonstrates excellent high-efficiency and broadband performance.
The combination of Chebyshev filtering and multi-cell architecture is effective for achieving target specifications.
This compact, high-performance amplifier is suitable for advanced wideband communication systems.