huytergan
Member level 3
Assuming that I have a GHz antenna with integrated LNA. I can use power supply to feed the LNA integrated to the antenna. How I can measure how much current the whole system draw?
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Using a resistor between them and make measurement on that with a multimeter couldn't be efficient since it's high freq and the resistor might not be suitable?Simply insert a amperometer in series between power supply and antenna.
No, the (low level) RF signal will not affect the DC measurement. However the insertion of the measurement system, if not properly RF decoupled will affect the RF performances of the antenna.
If you want just measure once the current consumption you can use the multimeter that has to be removed during the normal operation of the antenna.
I wanna ask one more Question. I did measure the current. After some voltage level, the current remained same even tho I increased the voltage( between the supply volt. limits of LNA). Does that mean it is okayCorrect. Remove then the multimeter when you want operare normally the antenna
What function can you imagine is included in the device to do this? It must also provide a constant impedance for input and output matching.I wanna ask one more Question. I did measure the current. After some voltage level, the current remained same even tho I increased the voltage( between the supply volt. limits of LNA). Does that mean it is okay