32results about How to "Avoid radiation interference" patented technology

The invention discloses a space-division-technology-based scanning method of a human body security check system for avoiding opposite radiation interference. According to the method, during scanning, the detection heights of antenna units in a first millimeter wave switch antenna array and a second millimeter wave switch antenna array are kept different at any time. With the scanning method disclosed by the invention, the opposite radiation interference of the switch antenna arrays on two sides of a millimeter wave active three-dimensional holographic imaging human body security check system is avoided and the imaging definition level is improved.

The present application discloses a low-radiation mounting structure of a server front wire cable which comprises a server box body made of metal materials, a front housing is mounted on one end of the server box body, a port circuit board is installed in the front housing, the port circuit board is connected to a main board mounted on the box body via a flat cable, an outer surface of the flat cable is provided with an electric cable shielding layer used for covering the flat cable, and the port circuit board and the server box body are electrically connected through the electric cable shielding layer. In the low-radiation mounting structure disclosed in the present application, the port circuit board and the server box body are electrically connected through the electric cable shieldinglayer to ensure that a differential mode current generated via the port circuit board in the front housing can flow back to the server box body, and then differential mode current can flow back to theearth through the server box body, radiation interference is prevented, and overall radiated emission energy is reduced.

The invention discloses a scan method of a human security system utilizing frequency division technology to avoid opposite radiation interference. The method comprises that in a scan period, at a same time, work frequency of detection signals which are provided by a first millimeter wave transceiver and a second millimeter wave transceiver are different. According to the invention, opposite radiation interference of two sides switch antenna arrays of a millimeter wave active three-dimensional holographic imaging human body security system is avoided, and an imaging sharpness level is raised.

The invention provides a wireless interference testing method and a wireless interference testing system. According to the wireless interference testing method, the wireless interference testing system is set up, communication links among devices in the wireless interference testing system are established, and accordingly, anti-interference tests for LTE-V2X communication links in a shielded-roomenvironment are realized. The wireless interference testing system comprises a shielded room, an interference unit, a combiner, an emitting unit and a receiving unit, wherein the interference unit, the combiner, the emitting circuit and the receiving unit are located in the shielded room. During wireless interference testing, an emitting terminal and a receiving terminal are arranged in a first shielding box and a second shielding box respectively, so that radiation electromagnetism of the emitting terminal in lab interference tests is prevented from entering the receiving terminal to cause radiation interference, and testing effectiveness and accuracy are improved greatly. In the shielded-room environment, accurately-rationed and parameter-adjustable interference source signals can be realized by a signal generator, so that testing accuracy and reoccurrence degree are improved while testing time is shortened effectively.

The invention discloses a high-isolation switch module, and specifically relates to the technical field of radio frequency switches. It solves the deficiency that the existing multi-stage radio frequency switches are connected in series and affect the performance of the switch isolation. The high-isolation switch module includes a main isolation unit, one end of the main isolation unit is provided with a signal input port, and the other end is connected to a plurality of switch lines, each switch line includes a plurality of cascaded isolation units, each switch line The last isolation unit is connected with a signal output port, and the adjacent isolation units are connected by a strip line; each isolation unit contains a radio frequency switch and a shielding wall, the radio frequency switch is a single-pole double-throw switch, and the shielding wall adopts microwave multilayer There are shielding holes evenly distributed on the shielding wall, and the shielding holes are "m-shaped" shielding holes. There is a metal shielding shell on the shielding wall, and the isolation of each switch line is 130dB in the frequency range of 100kHz‑8.5GHz.