You need to use directional coupler because you need something as a reference when you are doing measurement
GVVIN said:Thanks Abhi.
One query
Why we should use a directional couples . Cant I make a one port calibration and directly measure S11.
Further,
In my situation my antenna is a simple loop structure with an embedded microchip having a non 50 ohm impedance. Without the chip antenna impedance is only few ohms. to put my question in one line.
How to measure resonant frequency of an RFID tag ?
Regards
GV
GVVIN said:Thanks nccu1990
could you provide me more info on probe, vendor/manufacturer. I searched a lot and those I found was for wafer level probes and were very costly.
Regards
GV
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