Nonreciprocal circuit device with a balanced port and communication device incorporating the same

摘要

The present invention provides a communication apparatus incorporating a nonreciprocal circuit device capable of being connected to a balanced output circuit without interposing a balun, a hybrid, or the like therebetween. The nonreciprocal circuit device includes an assembly formed of three central conductors. On the upper surface of a disk-shaped microwave ferrite member, the central conductors are arranged intersecting each other at an angle of approximately 120 degrees in a mutually electrically insulated manner. The second and third central electrodes have connecting portions at first ends thereof and the second ends thereof are connected to a ground electrode. The first central electrode has connecting portions at both ends thereof. The connecting portions of the first central electrode serve as feeding ends. An input port provided by the ends of the first central electrode serves as a balanced input port. An output port connected to the second central electrode serves as an unbalanced output port. Another port connected to the third central electrode serves as a terminating port.