What components there are inside a GSM antenna ?
Antennas, per se, are passive and don’t contain any components. They are, themselves, inductors with resistance and capacitance (like all components). They resonate if properly tuned, and may include external matching networks, which are sometimes contained in the “radome”, the container for the antenna, which is transparent to radio frequencies.What components there are inside a GSM antenna ?
Unfortunately, no. What is your goal?Many thanks Yaakov,
do you know some book or web site that is involved in the antenna construction, manufacturing, design,
in the GSM, GPRS and GPS area ?
Like this for example:Any GSM antenna in particular?
That is an active antenna. It is not just an antenna, it requires a power supply, so it has some active circuitry in it. This could be an amplifier, maybe with some sort of filter. The antenna itself is not powered, but the amplifier in the radome needs it.
Many thank BertusHello,
Have a look at the attached PDF.
Bertus
Due to a labeling error on a quantity of this type of antenna, i need to recognize GSM from GPS antenna.That is an active antenna. It is not just an antenna, it requires a power supply, so it has some active circuitry in it. This could be an amplifier, maybe with some sort of filter. The antenna itself is not powered, but the amplifier in the radome needs it.
So this is really two things, being imprecisely called by the name of one.
Well, there may be no simple measurement you can make but if you have samples of the good ones and you consistently read a certain capacitance and/or resistance that is different from the others, that might work.Due to a labeling error on a quantity of this type of antenna, i need to recognize GSM from GPS antenna.
I try with a capacitance meter, to measure each one, but i'd like to know what is inside GSM (GPS)
antenna, so to be sure what is the antenna i am measuring. I measure 400 - 500pF (with 2,5m of RG174 cable)
in one antenna, and no measure (overload my tester) in the other antenna (with also 2,5m of RG174 cable).
Both are SMA-M terminated.
The JCB008 model.Hello,
Wich antenna do you have?
There are several on the give page.
Bertus
The model JCB008 in the page:Any GSM antenna in particular?
I would open one up and figure out which lead is which, then measure them and see if it is consistent on others. If so, that will work.The model JCB008 in the page:
https://www.jinchanggps.com/index.php?c=content&a=show&id=183
I follow your suggestion.The data sheet says there is an LNA for the GPS antenna, so it will have components to deal with the power supply coming in on the coast and that will make it different at DC than the GSM antenna. But I think the only way to be sure is open one, identify the leads, measure resistance, capacitance, and perhaps inductance on each and see how they differ.
I opened one unit, this is a picture of the inside.The data sheet says there is an LNA for the GPS antenna, so it will have components to deal with the power supply coming in on the coax and that will make it different at DC than the GSM antenna. But I think the only way to be sure is open one, identify the leads, measure resistance, capacitance, and perhaps inductance on each and see how they differ.
by Jake Hertz
by Jake Hertz
by Jake Hertz