Non-reciprocal circuit device and communication apparatus using the same

A communication apparatus comprising a non-reciprocal circuit device,

• wherein the non-reciprocal circuit device includes:
• a first substrates including a magnetic plate having a circular surface and a dielectric ring having an annular surface, the circular surface and the annular surface being substantially coplanar;
• a second substrate;
• a center conductor provided between the first substrate and the second substrate;
• and
• a permanent magnet that applies a magnetic field to the center conductor,
• wherein the center conductor includes:
• a main conductor portion positioned on a straight line extending from a center of the circular surface to an outer periphery of the annular surface;
• and
• a protrusion portion having a width smaller than a width of the main conductor portion, and
• wherein at least a part of the protruding portion is positioned on the annular surface.