Constant-Beamwidth Transducer (CBT) Arrays

By Pat Brown

This introduction to  Constant-Beamwidth Transducer (CBT) Arrays technology will get you thinking about possible applications.

We were pleased to have D.B. Keele, Jr. as a guest speaker at the recent Sound Reinforcement for Designers seminar in Louisville, KY. He presented his work on Constant-Beamwith Transducers (CBT). Much like the Bessel array was used to prevent a vertical line of transducers from forming a tight vertical pattern with increasing frequency, the CBT is a shaded circular-arc curved line array that produces the radiation pattern that one would expect from a large format constant-directivity (CD) horn.