Electronic device having diplexer of stacked structure

An electronic device comprising:

• an antenna;
• a wireless communication circuit;
• and
• a diplexer connected to the antenna and the wireless communication circuit,
• wherein the diplexer comprises:
• a first port connected to the antenna,
• a second port connected to the wireless communication circuit,
• a third port connected to the wireless communication circuit,
• a low pass filter (LPF) configured to filter a signal received from one of the first port and the second port so as to obtain an RF signal of a low-frequency band and to output the RF signal of the low-frequency band to the other port between the first port and the second port,
• a high pass filter (HPF) configured to filter a signal received from one of the first port and the third port so as to obtain an RF signal of a high-frequency band and to output the RF signal of the high-frequency band to the other port between the first port and the third port, and
• a ground structure connected to the LPF and the HPF,
• wherein the LPF comprises a capacitor disposed on an outer surface of a printed circuit board (PCB) and an inductor formed in a pattern within the PCB,
• wherein the HPF comprises an inductor disposed on the surface of the PCB and a capacitor formed in a pattern on the PCB,
• wherein the PCB comprises a plurality of layers,
• wherein the ground structure surrounds the LPF and the HPF along a direction in which the plurality of layers is stacked, and
• wherein the first port, the second port, and the third port are disposed on the outer surface of the PCB.