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This line of transmission shall fulfill the following requirements:
Antenna Line on PCB Requirements
Characteristic Impedance
50Ohm
Max Attenuation
0.3dB
Coupling with other signals shall be avoided
Cold End (Ground Plane) of antenna shall be equipotential to the HE910 V2 ground pads
Furthermore if the device is developed for the US and/or Canada market, it must comply with
the FCC and/or IC requirements.
This device is to be used only for mobile and fixed application.
Ensure that the antenna line impedance is 50ohm.
Keep line on the PCB as short as possible to reduce the loss.
Antenna line must have uniform characteristics, constant cross section, avoid meanders
and abrupt curves.
Keep one layer of the PCB used only for the Ground plane; if possible.
Surround (on the sides, over and under) the antenna line on PCB with Ground. Avoid
having other signal tracks directly facing the antenna line track.
The Ground around the antenna line on PCB has to be strictly connected to the main
Ground plane by placing vias once per 2mm at least.
Place EM noisy devices as far as possible from HE910 V2 antenna line.
Keep the antenna line far away from the HE910 V2 power supply lines.
If EM noisy devices are around the PCB hosting the HE910 V2, such as fast switching
ICs, take care of shielding of 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 do not have EM noisy devices around the PCB of HE910 V2, use a strip line on
the superficial copper layer for the antenna line. The line attenuation will be lower than
a buried one.
The HE910 V2, due to its sensitivity characteristics, is capable of performing a fix
inside buildings. (In any case the sensitivity could be affected by the building
characteristics i.e. shielding)
The Antenna must not be co-located or operating in conjunction with any other antenna
or transmitter.
Antenna shall not be installed inside metal cases.
Antenna shall be installed also according antenna manufacture instructions.
Содержание HE910-EU V2
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Страница 49: ...The RS232 serial port lines are usually connected to a DB9 connector with the following layout ...
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Страница 71: ... Telit_SIM_Integration_Design_Guide_Application_Note ...