Installation Instructions

Table Of Contents

L508 Hardware Design

 Pre-project evaluation

The selection of the antenna position first ensures that the antenna and the base station remain in the

Horizontal Direction, which produces the highest efficiency; second, try to avoid placing in the

switching power supply or data lines, chips and other devices that may produce electromagnetic

interference or near the chip. At the same time, avoid positions where the hand can be placed on the

antenna, which prevents the human body from attenuating the antenna, and take into account both

the reduced radiation and the structural feasibility. Therefore, the layout evaluation needs to be done

by the structure, ID, circuit, and antenna engineers at the beginning of the design.

 Antenna matching circuit

Antenna placement for notebook products: The ideal placement of LCD in the upper left or upper right,

this location is far from the motherboard, the electromagnetic interference is small, and considering

the relatively far from the human body, the SAR index is easy to meet; The next best position is the

left or right side of the LCD. Other products such as routers, e-books and so on according to the

specific characteristics of the product evaluation.

 Antenna footprint recommendation

Because different antenna manufacturers may use different antenna forms, therefore, the antenna

reserve space is also different: 4G 7-mode 17-frequency main antenna: 8mm (thick) * 12mm (wide) *

100mm (long).

 Motherboard Layout

There is a strong interference in the area of the motherboard, and the experimental results show that

the performance of the module will be worse if the module is placed in the area. When designing a

laptop, it is best to separate the module from the MOTHERBOARD PCB rather than install it on the

motherboard. If the separation is not possible, the module should be as far away from the chip and

memory, power interface, data line interface and other modules and devices that may cause EMI.