国产精品一区二区三区在线播放,国产高清免费一级一片视频播放 ,国产男女猛烈无遮挡免费视频,无码人妻一区二区三区免费手机

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: m.f4wow.cn

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
国产插鸡巴| 鹤岗市| 大鸡巴群交毛片儿视频在线观看| 国产亚洲成人逼| 和美女玩鸡巴视频| 去干网性爱视频| 美女让人操逼91| 美女被男生捅爽网站| 大黑鸡吧肏屄视频| 亚洲欧洲视频成人| 人妻一区二区一本| 国产视频在线视频嗯嗯啊啊啊| 亚洲超碰上在线| 下亚洲老熟妇又粗又长| 大骚女香蕉| 人妻丝袜av一区二区三区| www在线观看黄| 日本成人精品一区二区| 美女逼逼美逼操操操| 中国女人操逼美国大鸡巴| 青青草视频免费久久免线观看| 91国产老外a| 久久开心成人| 中国老熟女日逼| 大黑屌国产| 91潮吹| 激情十二月中文字幕| 操鸡网站免费看不用| 91无码大神| 美女被操射精视频| 美女搞b视频在线观看| 婷婷狠狠18禁久久| 欧美三级'日韩三级'亚洲三级人妻| 日本中文字幕一区二区电影| 无人精品在线视频观看| 制服丝袜国产美女91| 白朗县| 操逼最新| 韩国美女日逼网站| 亚洲一区AV电影| 吊视频一区二区三区在线|