Product Info

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the Type 1SC antenna pad by means of a transmission line implemented on the PCB.
In the case the antenna is not directly connected at the antenna pad of the Type 1SC, then a PCB line is needed
in order to connect with it or with its connector.
This transmission line shall fulfil the following requirements:
Item
Value
Characteristic Impedance 50 ohm
Max Attenuation 0.3 dB
Coupling Coupling with other signals shall be
avoided
Ground Plane Cold End (Ground Plane) of antenna
shall be equipotential to the Type 1SC
ground pins
The transmission line should be designed according to the following guidelines:
 Ensure that the antenna line impedance is 50 ohm;
 Keep the antenna line on the PCB as short as possible, since the antenna line loss shall be less than 0.3
dB;
 Antenna line must have uniform characteristics, constant cross section; avoid meanders and abrupt
curves;
 Keep, if possible, one layer of the PCB used only for the Ground plane;
 Surround (on the sides, over and under) the antenna line on PCB with Ground, avoid having other signal
tracks facing directly the antenna line track;
 The ground around the antenna line on PCB has to be strictly connected to the Ground Plane by placing
vias every 2mm at least;
 Place EM noisy devices as far as possible from Type 1SC antenna line;
 Keep the antenna line far away from the Type 1SC power supply lines;
 If you have EM noisy devices around the PCB hosting the Type 1SC, such as fast switching ICs, take
care of the shielding of the antenna line by burying it inside the layers of PCB and surround it with
Ground planes, or shield it with a metal frame cover.
 If you don't have EM noisy devices around the PCB of Type 1SC, by using a micro strip on the superficial
copper layer for the antenna line, the line attenuation will be lower than a buried one;
Transmission line design
The placement of components has been chosen properly, to keep the line length as short as possible, thus leading
to lowest power losses possible.