... devices for measuring impedance characteristics, Ultrasonic Impedance Analyzer Ultrasonic Impedance Analyzer are mainly applicable to all types of ultrasound ... frequency Fs, the anti-resonant frequency Fp, half-power point of F1 and F2, the largest admittance Gmax ... L1, free capacitor CT, the free dielectric constant, mechanical quality factor Qm, electromechanical coupling coefficient Keff , Kp, K31, ...