他揉捏她两乳不停呻吟a片,亚洲国产成人精品无码区99,无码jk粉嫩小泬在线观看欧美,黑人上司粗大拔不出来电影

Online Service
Scan it
Support hotline
18681482740
Service Hotline:
18681482740
中文  |   English
News
Contact

Address: Floor 1, Building 2, Quanshengchang Industrial Park, Buyong Shajing Road, Shajing Street, Shenzhen

Contact: Mr. Li 18681482740

Email: lilinhan1314@126.com

Website: www.kotuajans.com

News
What should be paid special attention to in the design of antenna shrapnel
04-30 / 2024

What should be paid special attention to in the design of antenna shrapnel?




1、 Motherboard




1. When wiring associated with RF, special attention should be paid to using a 45 degree angle or arc treatment at turns, and ground paving protection and characteristic impedance simulation of wiring should be done well. In addition, the RF ground should be designed reasonably and effectively. The reference ground plane for RF wiring should be found correctly, and the signal return path should be ensured to be the shortest when RF signal wiring, and the corresponding layer between RF signal wires and ground should not be affected by other wiring. The boundary between the board and the ground should be marked with a "ground wall". The antenna feed microstrip line led from the RF control module of the PCB circuit board should not be placed in the middle layer of the PCB circuit board to prevent the characteristic impedance of the line from being uncontrollable and reduce losses. It is advisable to design it on the TOP surface, and the reference layer should be a complete reference plane. And at the junction with the shielding box, the shielding box should be designed with slots and bypasses to prevent short circuits and bypass coupling.




2. Protect the surrounding area of the RF control module from scattered unshielded parts, and minimize the opening of heat dissipation holes. The most taboo is the elongated hole groove. The projection area of the mobile phone antenna shrapnel has a complete ground pavement, and it is best not to distribute components on the antenna side, especially parts containing metal components, such as audio speakers, motor motors, camera substrates, and low-frequency drive components, to be grounded as much as possible. These have a significant negative impact on the electrical characteristics of antenna shrapnel




3. The spatial radiation of antenna shrapnel will be coupled and absorbed by the metal parts of the motherboard (including the metal component decorative parts around the antenna on the chassis), resulting in a certain amount of secondary radiation. The frequency is related to the size of the metal product. This can lead to a certain level of noise in the entire machine, which is also related to the series resonance pairing control circuit between the antenna and RF control module. If the stability performance of the series resonance pairing control circuit is poor, it is easy to excite disturbances that generate higher-order harmonics. Therefore, it is stipulated that such parts have good grounding to eliminate or reduce secondary radiation.




2、 Design of the casing




Because the built-in antenna shrapnel on a mobile phone is relatively sensitive to the conductive medium around it, the design of the phone shell is inevitably related to the antenna characteristics. The surface coating material of the shell should not contain metal components, and it is best not to design any metal decorative or electroplated parts near the periphery of the shell near the antenna. If necessary, non-metallic processing techniques should be used to achieve this. The conductive spraying on the inner side of the casing should stop at a distance of 20mm from the antenna. For pure metal battery covers, they should be at least 20mm away from the antenna. If a monopole antenna is used, it is prohibited to use metal shells and circular metal decorations on the panel. The distance between the battery (including the electrical connection base) and the antenna should be designed at least 5mm.


Links:Zibo CNC machine tool automatic car washing machine Qingdao refrigeration equipment grinder equipment steel grit fire inspection cabinet sweeper motor desulfurization denitrification equipment drawing mold washing machine automatic soldering machine server repair HART475 hand operator dust-free cloth dust-free paper stack screw type Sludge dehydration machine, precision repair welding machine, Shandong motor repair, rotary hot pot equipment, integrated ultrasonic cleaning machine, Zhongjie radial drilling machine, beer equipment, Shenzhen brass manufacturer, welcome lamp, lens digging, drilling rig, aluminum housing manufacturer, automatic dispensing machine, automatic screwing machine neodymium Iron boron magnet 4g router wireless bridge
We provide you with high quality products
国产特黄a片aaaa毛片| 鸡毛飞上天电视剧全集观看免费| 特黄三级又爽又粗又大| 98国产精品综合一区二区三区| 亚洲成色www久久网站| 成人乱短篇500章小说| 古代翁妇乱高h辣文| 性一交一乱一交a片久久四色| 无码人妻丰满熟妇区96| 亚洲一区二区嗯好爽快点| 精品人伦一区二区三区蜜桃小说| 国自产拍偷拍精品啪啪模特| 又圆又大的奶越摸越大| 可以自由侵犯的游戏| 51精产国品一二三产区区别| 亚洲av无码成人精品区日韩| 97高清视频在线观看免费| 国产精品扒开腿做爽爽爽视频| 农村熟妇高潮精品a片| 亚洲视频在线观看| aa片在线观看视频在线播放| 男女作爱免费网站| 学生呦侵视频在线观看| 精品久久久久久亚洲偷窥一区| 大胸美女视频| 马鞍山师范高等专科学校| 国产精品毛片av久久66| 哭叫爽的翻白抽搐翻白眼| 国色天香一卡2卡三卡4卡乱码| 污调教贱乳打屁股扒开作文| 人妻熟人中文字幕一区二区| 美女动态高潮激烈xxoo270| 精品无码人妻一区二区三区| 国产av旡码专区亚洲av苍井空| 清冷医生h打开腿乖听话| 去部队探亲被全队肉辣文| 变成黑皮辣妹和朋友| 美少年高潮h跪趴扩张调教喷水| 岳让我弄进去看a片| 国产精品后入内射日本在线观看| 男女打扑克|