wave duct

wave duct

[′wāv ‚dəkt]
(electromagnetism)
Waveguide, with tubular boundaries, capable of concentrating the propagation of waves within its boundaries.
Natural duct, formed in air by atmospheric conditions, through which waves of certain frequencies travel with more than average efficiency.
References in periodicals archive ?
On the R6 engine, a quarter wave duct is integrated on the dirty air side and a twin chamber resonator suppresses noise emissions on the clean side.