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 Import into BibTeX
Subject: Transducers—Part 3
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=19234

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:   /conv/143/9837.pdf

Start a discussion about this paper!