What are the design details of the motherboard shielding covers used in mobile phones, routers, tablets, etc.?

In the products we often use such as mobile phones, routers, transformers, MIDs, etc., most of the motherboard shields are used on the motherboard. The shielding cover is an alloy metal cover, which is an important part to reduce the radiation of the display. It can effectively reduce the mutual interference between modules when used in MID or VR products. It is common in the main control function module, power supply module and Wifi module. Isolation between. And what issues should be paid attention to in the design of the motherboard shielding cover? Generally, there are products that use wireless communication, and shielding frames are usually designed on the circuit board (to isolate electromagnetic interference (EMI), but for the shielding frame to function, two parts are generally needed, one is to use SMT The other is the shielding frame. In this case, more than two sets of press molds are required. The surface of the shielding frame is mostly hollow, which is directly welded to the main board. The shielding cover is buckled around and directly buckled On the shielding frame. It is convenient to remove the shielding frame without removing the shielding frame when disassembling and repairing. In the PCB design of MID or VR products, we often shield some modules 1. Power module ( PMU+DCDC+LDO) Usually the power module exists on the PCB as a heat source and interference source, and a shielding cover is added to it to effectively reduce its external radiation interference. 2. Core module (CPU+DDR+Flash[ EMMC]) The core module is the core part of the PCB. Stable and undisturbed operation is an important part of the stability of the system. As a module that is susceptible to external interference, a shielding cover is usually designed to shield it. 3. Wifi And Bluetooth module With the continuous increase of module integration, WiFi module also integrates many other functions, such as Bluetooth. The more integrated, it will naturally interfere with the reception of WiFi signals. Another main source of interference is the PCB board. Components and high-frequency circuits when they work will produce strong interference. At this time, most brand manufacturers will use shielding to remove or reduce the interference from the motherboard to the antenna. Metal shields are a good choice, they can effectively shield The influence of electromagnetic waves on the internal circuit, of course, also blocks the electromagnetic waves generated inside from radiating outward. Of course, the location of the antenna is also more important. Generally, it is placed in a clean place on the side of the board. A Wifi Bluetooth module with a shielding cover is demonstrated. In the design of the main board shielding cover, some irregular shapes and designs with large convex-concave drop are avoided as much as possible. Hardware, 15 years of focusing on motherboard shielding, 5000 square meters production workshop, hundreds of precision processing production equipment, monthly processing capacity of 100+ sets of stamping dies, daily production capacity of 3 million punches, flatness control of motherboard shielding at 0.07mm, 16 The quality inspection is strictly controlled at all levels. Can quickly solve time-critical problems for you, solve stamping accuracy problems, and solve production quality problems!