A Transistor-Based Dual-Band High-Efficiency Rectifier With Dual-Polarity Modes
Zhiwei Zhang, Vincent Fusco, Zhiqun Cheng, Neil Buchanan, Chao Gu
Abstract
This letter proposes a dual-band high-efficiency rectifier using a GaN transistor. Positive polarity and negative polarity modes are set at <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$f_{1}$ </tex-math></inline-formula> , and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$f_{2}$ </tex-math></inline-formula> , respectively. Then, the rectifier operation at <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$f_{1}$ </tex-math></inline-formula> and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$f_{2}$ </tex-math></inline-formula> is realized upon adjusting only the phase of the corresponding feedback loop. This releases the limitation that the original power amplifier (PA) must be dual-band operation. In addition, class-F harmonic control theory is used to enhance efficiency. Moreover, the proposed technique has no frequency dependence and can be used to achieve arbitrary frequency ratios. To verify the effectiveness of the proposed method, a high-efficiency rectifier operating at 1.9 and 2.4 GHz is designed and fabricated using a CGH40010F GaN HEMT. Measurements illustrate that the implemented rectifier can realize an efficiency of over 75% at 1.9 GHz and 2.4 GHz when an input power of 40 dBm is applied and the dc load is <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$70~\Omega $ </tex-math></inline-formula> . Also, the size of circuit is only 4.7 cm <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times3.4$ </tex-math></inline-formula> cm.