图12. S21幅值在5~10 GHz的频率范围内有裂缝与无裂缝的比值 Q S 21(M11,M23,M26,M29)
Fig.12. The ratio Q S 21 of crack to no crack of S21 amplitude in the frequency range of 5~10 GHz (M11,M23,M26,M29)