A novel parallel running system of four oscillators coupled through an eight-port hybrid

A theoretical and experimental investigation of a novel power combining system of four oscillators symmetrically coupled through an eight-port hybrid is presented. This system is characterized by easy analyzability and adjustability resulting from the equal footing of the four oscillators and the four loads in system. In addition, it is shown that the output ports can be switched simply, e.g., by putting some metallic posts (or screws) into and out of the waveguides of the four passive ports. Experimental results are presented on a power combining system constructed of four Gunn oscillators, whose output powers and free-running frequencies were equally adjusted to 62.4 mW and 9.2 GHz, respectively, and whose external Q´s were about 78 on the average.<>