Abstract
We investigate efficiency limitations of frequency multipliers with the use of a simple model for symmetric varactors. Our calculations show that the conversion efficiency is improved for a C(V) shape with large nonlinearity at zero volt bias. For quintuplers, the optimal embedding impedance at the third harmonic is an inductance in resonance with the varactor diode capacitance. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 15: 26–29, 1997.
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