Planarizing Gysel power divider/combiner with ring coupler.

This letter proposes a N‐way planar power divider/combiner using a combination of a Gysel power divider and a ring coupler. This innovative approach enables the realization of a fully planar multiway (>2) Gysel power divider. By replacing the common point of the conventional Gysel power divider with a ring coupler, the entire symmetrical divider can be implemented on a two‐layer printed circuit board. To validate the design concept, an eight‐way planar power divider is designed, fabricated, and tested. Experimental results obtained within the frequency range of 5.10–7.25 GHz (34.8% fractional bandwidth) demonstrate excellent performance. The insertion loss is below 1.24 dB, the input port return loss exceeds 12.65 dB, the output ports exhibit return loss greater than 14.83 dB, the isolation exceeds 22.41 dB, and the maximum measured phase imbalance is within ±2.7°. [ABSTRACT FROM AUTHOR]