A finite unloaded quality-factor resonators based negative group delay circuit and its application to design power divider

This paper presents a novel approach to design a negative group delay (NGD) circuit based on finite unloaded quality-factor resonators. The proposed topology does not require a lumped element resistor to generate NGD. The NGD can be controlled by coupling between source and resonators as well as by unloaded quality-factor of resonators. Similarly, the NGD bandwidth can be controlled by coupling between resonators. The proposed topology can further apply to design power divider. The design theory of the proposed topology is proven through fabrication of NGD circuit and power divider at a center frequency of 2.14 GHz. The measurement results are in good agreement with simulations and predicated theoretical results.