The folded hybrid ring and its applications in balance devices

In this paper, a novel folded hybrid ring and its applications have been presented. The hybrid ring are folded for size reduction in the multilayered printed circuit media and employed as the transition between the microstrip line (MSL) and the parallel-strip line (PSL) for balanced circuit applications. The PSL has inherently advantages of easy realization of balanced configuration which is suitable for push-pull designs, especially for high power applications. The PSL makes the design of circuits more flexible than MSL because the lump components and solid state devices can be easily mounted in both series and shunt manners without any difficulties in fabrication.