Communication device and circuit board structure thereof

The invention discloses a communication device which comprises a circuit board, a first metal shielding structure, a radio frequency circuit and a fundamental frequency circuit, wherein the circuit board comprises a circuit layer, an insulation layer and a grounding layer; the insulation layer is arranged below the circuit layer, the grounding layer is arranged below the insulation layer, and the grounding layer upwards passes through the insulation layer and is provided with an isolated body in an extending way so as to isolate a first circuit area from a second circuit area; the first circuit area and the grounding end of the second circuit area are electrically connected with the grounding layer, and a gap is arranged between the first circuit area and the isolated body; and the radio frequency circuit is arranged on the first circuit area, the foundational frequency circuit is arranged on the second circuit area, and the first metal shielding structure is arranged above the circuit board structure and ele