2results about How to "Expand communication coverage" patented technology

This disclosure provides a metasurface antenna element, comprising a first metal layer, a first dielectric substrate, a second metal layer, a second dielectric substrate, and a third metal layer stacked sequentially; the second metal layer has various shaped cutouts; the orthographic projections of the first dielectric substrate, the second dielectric substrate, and the second metal layer on a preset surface coincide, and their orthographic projection outlines are all first regular polygons; the orthographic projections of the first metal layer and the third metal layer on the preset surface coincide, and their orthographic projection outlines are all second regular polygons; the side length of the first regular polygon is a first preset multiple of the incident wave wavelength at the center frequency, and the side length of the second regular polygon is a second preset multiple of the incident wave wavelength at the center frequency, wherein both the first preset multiple and the second preset multiple are less than 1. This disclosure also provides an antenna structure.

The invention provides an unmanned aerial vehicle cluster networking communication system and method, and belongs to the technical field of unmanned aerial vehicle communication. Comprising at least one main control unmanned aerial vehicle, and the main control unmanned aerial vehicle is provided with a first communication module, a first positioning module, a first data processing module and a dynamic network management module. Each slave unmanned aerial vehicle is provided with a second communication module, a second positioning module and a second data processing module; the relay unmanned aerial vehicle is provided with a third communication module and a signal enhancement module; and the ground control center is connected with the main control unmanned aerial vehicle through wireless communication. Network topology can be dynamically adjusted according to position changes, communication quality parameters and task requirements of the unmanned aerial vehicles, multi-band communication switching is supported, data security is guaranteed by adopting dynamic key encryption, a perfect fault processing mechanism is provided, and high efficiency, stability and security of unmanned aerial vehicle cluster communication are ensured.