FRIENDCOM WSN27-915R Gebruikershandleiding - Pagina 7

Blader online of download pdf Gebruikershandleiding voor {categorie_naam} FRIENDCOM WSN27-915R. FRIENDCOM WSN27-915R 20 pagina's.

The Wi-SUN RF module is packaged in a stamp hole patch. All I/O ports and antenna ports need to

be led out from the user board. Suggested RF signal routing: PCB Layout RF routing between the

module and the antenna is required to be 50Ω Impedance rule design, and trace length as short as

possible. Since the impedance cannot be controlled, it is recommended that the impedance line

width be 0.8-1mm when routing the PCB Layout, and the distance between the surrounding

grounding copper foil be 1-1.5 times the line width. Ground vias to ensure that the grounding

impedance is as small as possible. Keep the RF port away from all sources of interference, especially

high-speed digital signals and switching power supplies, otherwise the receiving sensitivity of the

module will be reduced.

If a long trace is used, a matching network needs to be added in the middle, as shown in the figure

below.

In order to reduce the reduction of the antenna performance caused by the parasitic capacitor

caused by the RF pad, the first and second layers of the module radio frequency port pads are

recommended to be hollowed out, as shown in the figure below.

The method of outer radiation frequency feed cable or IPEX welding is connected to the module,

but it is necessary to ensure the sufficientness of the welding and prevent excessive cable damage

from affecting the radio frequency performance of the module. The effect diagram of the two

connection methods is shown in the figure below.

The antenna used in the module must meet the equipment standards. The Bobby should be

between 1.1 and 1.5, the input impedance is 50Ω, the use environment is different, and the gain

requirements for the antenna are also different. Generally, the greater the internal gain, the more

foreign gain, the gain of the external gain, The smaller, the better the antenna performance

Notice: Check the stick external antenna specification for details.