3results about How to "Structure is easy to implement" patented technology

The utility model relates to the technical field of communication, in particular to a built-in FPC (Flexible Printed Circuit) antenna for tunable broadband. The utility model provides a tunable broadband built-in FPC antenna, which comprises a dustproof layer, an electromagnetic shielding cover, a wire end and the like, the electromagnetic shielding cover is arranged on the lower side of the dustproof layer, and the dustproof layer is connected with the wire end. Through the design of integrating a plurality of switchable inductance elements, dynamic tuning and accurate matching of the resonant frequency of the antenna are realized, not only is the adaptive capacity of the antenna under different frequency bands enhanced, but also the working bandwidth of the antenna is effectively widened, and the requirements of a modern communication system for multi-frequency band, high integration level and intelligent tuning are met; low return loss can be realized in a target frequency band, and the matching performance of the antenna and a transmission line and the signal transmission efficiency are improved; the method adapts to a wide frequency band range, and the performance of multiple frequency points is good; the structure is convenient to realize, manufacturing and integration are facilitated, cost is reduced, and the antenna can be widely applied to internet of things 4G antenna projects such as power banks and water meters.

The invention discloses an aerial imaging device based on a retro-reflection microstructure array, which relates to the field of aerial imaging and comprises a retro-reflection microstructure array, a spectroscope, a quarter-wave plate and an image source. Light beams emitted by the image source are reflected by the reflection polaroid, penetrate through the quarter-wave plate, reach the retroreflection microstructure array, are reflected by the retroreflection microstructure array, sequentially penetrate through the quarter-wave plate and the spectroscope, and are converged in the air to form a real image. According to the device, the physical reflection and transmission characteristics of the inclined spectroscope are utilized, and the directional reflection function of the retro-reflection microstructure array is combined to realize light path guiding, so that large-size and large-view-angle aerial imaging of naked eyes is realized. And there is no multi-layer stacking design between the elements, and there is no need to arrange a special interference light filtering element, thereby effectively reducing the cost. The problems that an existing aerial imaging display technology is large in implementation difficulty, the display resolution is limited by the size of a plane mirror, and ghost shadows exist after imaging are solved.