Circuit board including insulating layer having a plurality of dielectrics with different dielectric loss, and electronic device including the circuit board

An electronic device comprising:

• a communication circuit;
• and
• a circuit board including a first surface and a second surface facing away from the first surface, wherein the circuit board includes:
• a first portion including a first layered structure in which part of a plurality of wiring layers and part of a plurality of first insulating layers are alternately positioned from the first surface to the second surface;
• a second portion including:
• a second layered structure in which another part of the plurality of wiring layers and another part of the plurality of first insulating layers are alternately positioned from the first surface to a first layer provided between the first surface and the second surface, and
• a second insulating layer positioned on the first layer up to the second surface and forming a portion of the second surface;
• at least one antenna patch positioned on the second insulating layer or within the second insulating layer;
• and
• a conductive line penetrating the second layered structure and at least a portion of the second insulating layer and electrically connecting the at least one antenna patch and the communication circuit,
• wherein the communication circuit is disposed on the first surface, and
• wherein the plurality of first insulating layers have a first loss tangent value, and the second insulating layer has a second loss tangent value smaller than the first loss tangent value.