Inhomogeneous waves behave locally like A(r) exp[ikS(r)], where A and S are spatially dependent complex amplitude and phase functions, and k is the (large) free-space wavenumber. A previously ...

New architecture could be used to create tailored devices that emit or receive only certain frequencies of sound ...

Quantum mechanics describes the unconventional properties of subatomic particles, like their ability to exist in a ...

An international research team led by the Helmholtz-Zentrum Hereon has, for the first time, succeeded in visualizing and ...

A phase-steered linear array feed for a parabolic cylindrical reflector antenna is considered. The nearly cylindrical wave radiated from this line feed in the Fresnel zone is expressed in terms of the ...