Proximity sensor module and electronic device using same

An electronic device, comprising:

• a CPU;
• a radio frequency (RF) circuit;
• a proximity sensor module comprising:
• a combination sensing element and antenna, electrically connected to the RF circuit, working as both an antenna and a sensing element, used to detect whether an external object is in vicinity of the combination sensing element and antenna according to capacitance changes of the combination sensing element and antenna in presence or absence of the external object in the vicinity;
• a detecting circuit, electrically connected to the combination sensing element and antenna and the CPU, detecting the capacitance changes, and generating a signal associated with the changes to the CPU, the CPU decreasing or increasing transmission power of the RF circuit transmitted to the combination sensing element and antenna according to the signal;
• and
• a filter circuit, wherein the filter circuit is electrically connected between the detecting circuit and the combination sensing element and antenna to reduce noise induced between the detecting circuit and the combination sensing element and antenna.