Constant Directivity Circular-Arc Arrays of Dipole Elements

Taylor R, Manke K, Keele J,DB(. Constant Directivity Circular-Arc Arrays of Dipole Elements. In: AES Convention 143. Audio Engineering Society; 2017. Paper 9837. Available from: https://aes.org/publications/elibrary-page/?id=19234

@inproceedings{Taylor2017_19234,
  author = {Taylor, Richard and Manke, Kurtis and Keele, Jr., D. B. (Don)},
  title = {{Constant Directivity Circular-Arc Arrays of Dipole Elements}},
  booktitle = {AES Convention 143},
  note = {Paper 9837},
  year = {2017},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=19234}
}

TY  - CPAPER
TI  - Constant Directivity Circular-Arc Arrays of Dipole Elements
AU  - Taylor, Richard
AU  - Manke, Kurtis
AU  - Keele, Jr., D. B. (Don)
T2  - AES Convention 143
M1  - Paper 9837
PY  - 2017
DA  - 2017/10/06
UR  - https://aes.org/publications/elibrary-page/?id=19234
PB  - Audio Engineering Society
LA  - en
AB  - 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.
ER  -