The present disclosure relates to an electronic device comprising: a circuit board installed inside the body of the electronic device and formed by alternately laminating conductive layers made of a conductive material and dielectric layers made of an insulative material; at least one patch antenna arranged on the circuit board; a core layer positioned at the center portion inside the circuit board and made of one of the dielectric layers; a ground layer arranged on the lower portion of the core layer; and an EGB structure positioned inside the circuit board and shaped such that the upper and lower portions thereof are symmetric with each other with reference to the core layer, wherein the EGB structure can limit interference between operating frequency signals emitted from respective patch antennas.