4results about How to "Improved Angular Stability" patented technology

The invention discloses a programmable metasurface unit chip and a programmable metasurface, and the unit chip sequentially comprises a first dielectric layer, a first bonding dielectric layer, a controllable metal layer, a second bonding dielectric layer, a third dielectric layer, a third metal layer, a third bonding dielectric layer, a fourth dielectric layer and a fourth metal layer from top to bottom. The controllable metal layer comprises a metal structure and a controllable element and is used for forming two isolation electromagnetic wave regulation and control channels so as to independently control orthogonal polarization electromagnetic waves and provide independent and controllable electromagnetic response for the incident orthogonal polarization electromagnetic waves; the third metal layer is used as a radio frequency ground for improving the electromagnetic wave reflection performance; the fourth metal layer is used for inputting bias voltage; and bias voltage is loaded to the controllable element through the metal holes of each layer. The plurality of unit chips are arranged on the substrate in an array mode to form the metasurface. The unit chip provided by the invention can greatly reduce the design and implementation complexity of the metasurface, reduce the production and maintenance cost, and promote the application of the metasurface in a wireless information system.

The invention relates to the technical field of communication, in particular to a frequency selective surface structure for a 5G base station and a filtering antenna array of the frequency selective surface structure. The frequency selective surface structure for the 5G base station comprises at least one filtering unit, the filtering unit is in a sheet shape, and the filtering unit comprises an external metal layer, a dielectric substrate, a middle metal layer, another dielectric substrate and another external metal layer which are stacked in sequence; the outer metal layer comprises a plurality of first metal sheets, the first metal sheets are arranged in a square array, the first metal sheets are square metal sheets, aperture windows are formed in the middles of the first metal sheets, gap grooves are formed in the four faces of each first metal sheet, and the aperture windows and the gap grooves are separated through bent connecting parts. According to the frequency selective surface structure for the 5G base station, the requirement of a 5G Massive MIMO antenna base station for a filter in a radio frequency channel can be effectively released, and the frequency selective surface structure has the advantages of being low in loss, wide in scanning angle, good in directional diagram conformality, simple in structure and low in implementation cost.

The application discloses a universal joint ball pair locking mechanism and medical equipment, and relates to the field of medical equipment. The universal joint ball pair locking mechanism comprises a ball joint and a locking assembly. The ball joint comprises an inner ball head and an outer ball body which are hingedly connected with each other. The locking assembly comprises a first engaging member, a second engaging member and an unlocking driving member. The application realizes rigid locking through the engagement of the first engaging member and the second engaging member. The locking design is not affected by factors such as changes in the friction coefficient and wear, and can stably maintain the relative angle of the inner ball head and the outer ball body, thereby avoiding adverse loosening caused by friction failure and improving the stability of the locking strength. The locking assembly has two states of locking and unlocking. When unlocked, the inner ball head and the outer ball body can be universally adjusted, thereby meeting the requirement of flexible equipment to reach a target position and angle. When locked, stable support is provided through rigid engagement, and the use requirements of flexible adjustment and reliable locking are considered, so that the application is well applicable to application occasions of the stability of equipment operation.

The invention belongs to the field of frequency selective surface (FSS) design, and particularly provides a dual-polarization frequency selective surface with a high angle stability characteristic, which is formed by periodically arranging M * N unit structures, each unit structure comprises a first metal patch layer T1, a first foam structure layer P1, a second metal patch layer T2, a first dielectric structure layer J1, a third metal patch layer T3, a second dielectric structure layer J2, a fourth metal patch layer T4, a second foam structure layer P2 and a fifth metal patch layer T5 which are sequentially stacked from top to bottom. Wherein T1 and T5 are completely identical, T2 and T4 are completely identical, P1 and P2 are completely identical, and J1 and J2 are completely identical; through the creative design of the unit structure, the frequency selective surface has a wide passband and low insertion loss wave transmission when electromagnetic waves are incident at a large angle, and the working frequency and bandwidth of TE and TM polarized electromagnetic waves can be independently regulated and controlled.