论文信息 - A 2.4 GHz-Band 100 W GaN-HEMT High-Efficiency Power Amplifier for Microwave Heating

A 2.4 GHz-Band 100 W GaN-HEMT High-Efficiency Power Amplifier for Microwave Heating

The magnetron, a vacuum tube, is currently the usual high-power microwave power source used for microwave heating. However, the oscillating frequency and output power are unstable and noisy due to the low quality of the high-voltage power supply and low Q of the oscillation circuit. A heating system with enhanced reliability and the capability for control of chemical reactions is desired, because microwave absorption efficiency differs greatly depending on the object being heated. Recent studies on microwave high-efficiency power amplifiers have used harmonic processing techniques, such as class-F and inverse class-F. The present study describes a high-efficiency 100 W GaN-HEMT amplifier that uses a harmonic processing technique that shapes the current and voltage waveforms to improve efficiency. The fabricated GaN power amplifier obtained an output power of 50.4 dBm, a drain efficiency of 72.9%, and a power added efficiency (PAE) of 64.0% at 2.45 GHz for continuous wave operation. A prototype microwave heating system was also developed using this GaN power amplifier. Microwaves totaling 400 W are fed from patch antennas mounted on the top and bottom of the microwave chamber. Preliminary heating experiments with this system have just been initiated.

Keigo Nakatani | Toshio Ishizaki

[1] D. Schmelzer,et al. A GaN HEMT Class F Amplifier at 2 GHz With $>\,$80% PAE , 2006, IEEE Journal of Solid-State Circuits.

[2] Eizo Mitani,et al. An 800-W AlGaN/GaN HEMT for S-band High-Power Application , 2007 .

[3] Koji Yamanaka,et al. Internally matched GaN FET at C-band with 220W output power and 56% power added efficiency , 2012, 2012 Asia Pacific Microwave Conference Proceedings.

[4] K. Motoi,et al. A 72% PAE, 95-W, single-chip GaN FET S-band inverse class-F power amplifier with a harmonic resonant circuit , 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

[5] Chuan Yi Tang,et al. A 2.|E|-Bit Distributed Algorithm for the Directed Euler Trail Problem , 1993, Inf. Process. Lett..

[6] S. Sano,et al. A 100W Class-E GaN HEMT with 75% Drain Efficiency at 2GHz , 2006, 2006 European Microwave Integrated Circuits Conference.

[7] Youngje Sung,et al. A Polarization Diversity Patch Antenna with a Reconfigurable Feeding Network , 2015 .

[8] M. Nakayama,et al. X- and Ku-band internally matched GaN amplifiers with more than 100W output power , 2012, 2012 7th European Microwave Integrated Circuit Conference.

[9] Y. Hirano,et al. Internally-matched GaN HEMT high efficiency power amplifier for Space Solar Power Stations , 2010, 2010 Asia-Pacific Microwave Conference.

[10] Hong-Min Lee. Effect of Loading Split-Ring Resonators in a Microstrip Antenna Ground Plane , 2015 .