The RF antenna connection uses one of the LGA pads of the WS6318 embedded module, with ground pads at both sides.
This LGA pad must be connected to a 50Ω RF line in order to protect the antenna line from the noise coming from baseband signals.
This 50Ω line is surrounded by two ground planes in order to protect this antenna line from noise.
The length of the line shouldn’t be too long (more than a few centimeters) because of RF insertion loss. The width of the line must be calculated in order to ensure a 50 Ω characteristic impedance.
For this same reason, the RF embedded line should likewise be kept about 1cm away from any (noisy) baseband signal in order to ensure good RX sensitivity level.
The other end of the RF 50Ω line can be connected to a n RF connector or a soldering pad in order to connect an antenna.
It is also possible to use an antenna chip or to design a PCB antenna directly on the application board.
The ANT pin of the WS6318 embedded module is ESD protected, for both ±4KV contact and ±8KV air discharge. One of the suggested ESD diodes is listed below:
Manufacturer: INNOCHIPS TECHNOLOGY CO.
Part Number: ULCE0505A015FR
In order to enhance the antenna’s resistance to higher ESD levels, it is recommended to add an ESD diode close to the RF connector of the final application