Method of Microwave Motion Detection with Adaptive Frequency Control and Related Devices

A microwave motion sensor with adaptive frequency control, wherein the microwave motion sensor is operated in a normal mode or in a detection mode, the microwave motion sensor comprising:

• an oscillator, configured to generate a first detecting signal with a first frequency in the normal mode, and configured to generate a second detecting signal with a second frequency in the detection mode, wherein the second frequency is different to the first frequency;
• a transmission amplifier, coupled to the oscillator, configured to amplify the first detecting signal and output the amplified first detecting signal for motion detection in the normal mode, and suppress output of the first detecting signal in the detection mode;
• a mixer, coupled to the oscillator, configured to for generate a first mixing signal according to the first detecting signal and a reflected signal in the normal mode, wherein the reflected signal is due to a motion event of an object and is related to the first detecting signal, and configured to generate a second mixing signal according to the generated first detecting signal and an interference signal in the detection mode;
• and
• a detector, coupled to the mixer and the oscillator, configured to switch the microwave motion sensor between the normal mode and the detection mode according to the first mixing signal and the second mixing signal.