2 results about "Radiation impedance" patented technology

This utility model relates to the field of composite panel structure technology, specifically a sound insulation and vibration reduction partition for ship cabins containing acoustic black holes. The partition includes: an acoustic black hole thin plate layer, a damping material layer, and a honeycomb panel layer. Multiple sets of acoustic black hole structures are arranged in an array on the acoustic black hole thin plate layer, and the thickness of the acoustic black hole region satisfies a power law. The damping material layer forms an energy buffer interface, and its two sides are connected to the acoustic black hole thin plate layer and the honeycomb panel layer, respectively. The honeycomb panel layer is used to complete acoustic radiation impedance matching and suppression. This utility model constructs a complete acoustic vibration control chain of "vibration capture - energy dissipation - acoustic impedance matching" through gradient impedance design of each functional layer, improving sound insulation without increasing mass. It is particularly suitable for applications such as ship cabins that are weight-sensitive and require broadband noise reduction.

The application discloses a tunneling light-emitting device based on barrier-mode field impedance matching and a modulation method thereof, comprising a substrate, an insulating tunneling layer arranged on the substrate, and a metal nano antenna array arranged on the insulating tunneling layer, wherein the metal nano antenna array is a periodically arranged metal strip array, and the geometric parameters of the metal nano antenna array and the electrical parameters of the insulating tunneling layer are cooperatively configured, so that, under the bias voltage of the tunneling light-emitting device, the differential tunneling resistance of the insulating tunneling layer and the equivalent radiation impedance of the metal nano antenna array at the excitation wavelength realize conjugate matching or mode value matching, so as to promote the efficient transfer of the tunneling electron energy to the optical mode; the advantage is that the critical coupling of the electron tunneling rate and the optical mode radiation rate can be realized, so that the electroluminescent efficiency is significantly improved, and the energy transmission efficiency is relatively high.