Hello,
In one of my projects, I use a GSM/LTE modem (SIM7000G by Simcom)
In the current design, we use a U.FL connector for the antenna.
We use a flexible printed antenna that is connected to the U.FL connector and glued to the interior of the enclosure.
Now, the customer wants the option to connect an external antenna but he doesn't want the end user to open the enclosure.
I added an SMA antenna connector in parallel to the U.FL connector.
My questions are as follows:
1. Is this design common practice? Considering the the U.FL antenna is always connected, will another, un-terminated SMA connector can interfere with the antenna reception/transmission?
2. Will connecting the second, external antenna, can interfere with the device reception/transmission? - In that case we have two working antennas connected to the same line.
See schematics of the relevant part attached.
Thanks,
Tomer
In one of my projects, I use a GSM/LTE modem (SIM7000G by Simcom)
In the current design, we use a U.FL connector for the antenna.
We use a flexible printed antenna that is connected to the U.FL connector and glued to the interior of the enclosure.
Now, the customer wants the option to connect an external antenna but he doesn't want the end user to open the enclosure.
I added an SMA antenna connector in parallel to the U.FL connector.
My questions are as follows:
1. Is this design common practice? Considering the the U.FL antenna is always connected, will another, un-terminated SMA connector can interfere with the antenna reception/transmission?
2. Will connecting the second, external antenna, can interfere with the device reception/transmission? - In that case we have two working antennas connected to the same line.
See schematics of the relevant part attached.
Thanks,
Tomer