We develop the theory for a broadband constant-beamwidth transducer (CBT) formed by a conformal circular-arc line array of dipole elements. Just as for CBT arrays of point sources, with suitable amplitude shading of the source distribution the far-field radiation pattern is constant above a cutoff frequency. This cutoff frequency is determined by the prescribed beam width and arc radius. We illustrate the theory with examples, including numerical simulations of magnitude responses, full-sphere radiation patterns, and directivity index. Unlike a circular-arc array of monopole elements, a dipole CBT maintains directivity control at low frequency. We give an example of one such array that achieves just 1 dB variation in directivity index over all frequencies.

Authors: Taylor, Richard; Manke, Kurtis; Keele, Jr., D. B. (Don)
Affiliations: Thompson Rivers University, Kamloops, BC, Canada; DBK Associates and Labs, Bloomington, IN, USA(See document for exact affiliation information.)
AES Convention: 143 (October 2017) Paper Number: 9837
Publication Date: October 8, 2017
Subject: Transducers—Part 3

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