Acoustic matching member, manufacturing method thereof and ultrasound device including the same

An acoustic matching member for transmitting an ultrasonic wave from an incident medium (I) to a target medium (T) such that 90% or more of the ultrasonic wave is transmitted through a barrier (B) disposed between the incident medium (I) and the target medium (T), comprising:

• the acoustic matching member being configured in consideration of overall acoustic wave-propagation characteristics of an I-B-T structure including an acoustic impedance (ZB), a thickness (dB), and a wavenumber (kB) of the barrier (B),
• wherein an effective acoustic impedance (Z) of the acoustic matching member satisfies an impedance matching condition such that an input impedance of the I-B-T structure substantially matches an impedance of the incident medium (I),
• wherein a phase characteristic of an ultrasonic wave propagating through the acoustic matching member satisfies a phase change matching condition such that phase delay and phase mismatch caused by propagation through the barrier (B) are compensated,
• wherein the acoustic matching member includes a matching pattern designed according to the impedance matching condition and the phase change matching conditions,
• wherein the matching pattern has a structure in which unit structures including a single X-shaped pattern are arranged.