hi, i am building a project and i need to source a ultrasonic transducer that can output frequencies over a bandwitdth of 1 to 3mhz minimum without significant frequency attenuation. The only thing i can find online is research papers to Lead Zirconate Titanate Thick-Film Ultrasonic Transducers which can output a fairly flat range of 1 to 20 MHz Frequency Bands but i can not find any company that manufactures these. Can anyone help me to source a component that would output a relatively flat frequency response over 1 - 3mhz range? im stuck, thanks,