Wave-based control for nonreciprocal acoustics using a planar array of secondary sources

an infinite planar array of rectangular microstrip patch antenna analysis

the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...

Investigation of Submerged Vanes Array for Sediment Control at Intake Using a Physical Model

Investigation of Submerged Vanes Array for Sediment Control at Intake Using a Physical Model

Nonreciprocal reflection of a subwavelength hole array.

We present measurements of the wavelength-dependent reflectivity of a subwavelength metal hole array on a glass substrate. We compare the observed resonant structures with those found in transmission and note a nonreciprocity under illumination from the air versus the glass side. This can be used to verify on which interface the surface plasmons are resonantly excited and to estimate the losses...

Wave-based numerical methods for acoustics

Recent developments in wave-based numerical methods are reviewed in application to problems in acoustics where small perturbations of pressure and velocity propagate on a steady compressible mean flow. In the most general case, such wave fields are represented by the solution of the linearized Euler equations. In the case of steady time-harmonic solutions in a homogeneous medium and in the abse...