Balanced RF Rectifier for Energy Recovery With Minimized Input Impedance Variation

A balanced RF rectifier is proposed to replace terminations in microwave circuits and thus to recycle the otherwise dissipated power in resistances. In order not to degrade the performance of the original circuits, a balanced configuration is adopted because it minimizes the variation of input imped...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2017-05, Vol.65 (5), p.1598-1604
Main Authors: Wei, Muh-Dey, Chang, Ya-Ting, Wang, Defu, Tseng, Chao-Hsiung, Negra, Renato
Format: Article
Language:English
Subjects:
Balanced
Circuits
Couplers
Dissipation
Energy recovery
energy recycling
Harmonic analysis
Impedance
Input impedance
Microwave circuits
Power efficiency
Radio frequency
Rectifiers
Reflectance
Reflection
Resistance
resistance compression network
RF rectifier
Schottky diodes
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Summary:A balanced RF rectifier is proposed to replace terminations in microwave circuits and thus to recycle the otherwise dissipated power in resistances. In order not to degrade the performance of the original circuits, a balanced configuration is adopted because it minimizes the variation of input impedance of the rectification circuitry. This approach achieves good input reflection coefficient over a large dynamic range and operating frequencies. The highly efficient energy recycler is composed of a 3dB quadrature coupler and two identical RF rectifiers. The impact of amplitude and phase imbalances of the transfer characteristics of the coupler is discussed. Furthermore, an arbitrary-port-resistance coupler is studied to replace non-50-Ω terminations. The experimental verification demonstrates that the proposed circuit provides an input reflection coefficient of better than -15 dB from 2.2 to 2.5 GHz over different input power levels. The measured peak RF-to-dc efficiency is 74.9% at 2.34 GHz with S11 = -24 dB. The proposed balanced rectifier thus significantly improves S11 over existing rectifiers and is therefore suitable for replacing resistive terminations in a large variety of circuits.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2016.2642959