A vital sign sensor capable of resisting clutter generates an oscillating signal by the SIL oscillator, and the oscillating signal transmits to an object in the form of wireless signal by an antenna set. The antenna set receives a reflecting signal reflected from the object, and the reflecting signal in injected-locking into the SIL oscillator. The wireless signal transmitted by the antenna is delivered to a demodulator unit for demodulating and obtaining the vital sign of the object. Wherein, an isolated part of the antenna set could prevent a clutter signal reflected from the demodulator and its environment transmits to the SIL oscillator to avoid the clutter signal interfere the detection of the vital sign of the object.一種可抵抗雜波之生理徵象感測器藉由一SIL振盪器產生一振盪訊號，該振盪訊號經由一天線組以一無線訊號之形式發射至一物體，該天線組並接收由該物體反射之一反射訊號，該反射訊號注入鎖定該SIL振盪器，該天線組發射之該無線訊號並傳送至一解調單元進行解調，以得到該生體之生命徵象，其中，天線組之一隔離部可避免由解調單元及其所處環境反射之一雜波訊號傳送至該SIL振盪器，以避免該雜波訊號干擾該物體之生命徵象的偵測。
