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A Miniaturized WiMAX Band 4-W Class-F GaN HEMT Power Amplifier Module

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3 Author(s)
Hae-Chang Jeong ; Dept. of Radio Sci. & Eng., Chungnam Nat. Univ., Daejeon, South Korea ; Hyun-Seok Oh ; Kyung-Whan Yeom

In this paper, the design and fabrication of a miniaturized 4-W power amplifier for the WiMAX frequency band (2.3-2.7 GHz) is presented. The selected active device is a commercially available GaN HEMT chip from TriQuint Semiconducotr Inc., Hillsboro, OR. The optimum input and output impedances of the GaN HEMT at fundamental frequency are extracted using a custom designed tuning jig. A novel output matching network for class-F operation is proposed and designed using the measured impedances. For integration in a small package, the input and output matching networks are implemented using spiral inductors and interdigital capacitors, and their dimensions were determined using electromagnetic simulation. The fabricated power amplifier is 4.4 × 4.4 mm2 and has an efficiency above 50% and harmonic suppression above 40 dBc for second and third harmonics at an output power of 36 dBm.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:59 ,  Issue: 12 )

Date of Publication:

Dec. 2011

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