Portable electronic device

A portable electronic device, comprising:

• a housing;
• a first circuit board, disposed in the housing, wherein the first circuit board comprises a first ground element, a first edge and a second edge, and the first edge is opposite to the second edge;
• an antenna, disposed on the first circuit board near to the first edge, wherein the antenna transmits a wireless signal, the wireless signal has a wavelength λ, and a resonance current is generated on the first ground element according to the wireless signal;
• and
• a metal sheet, disposed in the housing, insulated from the first ground element, wherein the metal sheet is near to the second edge, and the metal sheet couples the first ground element to guide the resonance current spread on the first ground element uniformly.

A portable electronic device, comprising:

• a housing;
• a first circuit board, disposed in the housing, wherein the first circuit board comprises a first ground element, a first edge and a second edge, and the first edge is opposite to the second edge;
• an antenna, disposed on the first circuit board near to the first edge, wherein the antenna transmits a wireless signal, the wireless signal has a wavelength λ, and a resonance current is generated on the first ground element according to the wireless signal;
• and
• a metal sheet, disposed in the housing, insulated from the first ground element, wherein the metal sheet is corresponding to the center of the first circuit board, and the metal sheet couples the first ground element to guide the resonance current spread on the first ground element uniformly.