Development of improved 24GHz-band class-F load rectennas

Abstract

We improved class-F load rectennas at 24GHz which optimal load and optimal input power were different from the designed ones. We focused on the class-F load which is the most important point in class-F load rectennas. Through analysis of electromagnetic field, we clarified that we could simulate accurately with a circuit analysis simulator when the discontinuity in a microstrip line was small and the thickness of the substrate was thin enough to suppress the effect of the surface wave. We also found that 3rd harmonics management was enough for class-F load rectennas to produce high efficiency. We designed and fabricated the new-type class-F load rectennas. We could not improve the efficiency, but we revealed that the disagreement of the optimal load and the optimal input power was not caused by the effect of the surface wave.