input impedence of antenna

[Barack]

can I using LCR to measure the input impedence of an antenna. the resualt I can trust or not.

 

[volker_muehlhaus]

You mean ... at low frequency for RFID tag?

 

[flanello]

I would say it depends on the frequency of your LCR meter and the antenna.
If the frequency are the same, it should work.
But you cannot measure with a LCR meter the impedance of a high frequency antenna.

 

[Barack]

yes, you right. 58kHz or 8.2MHz

---------- Post added at 02:51 ---------- Previous post was at 02:42 ----------

center frequency of the antenna only 58KHz, so, you mean...I can measure the impedence of the antenna if I set LCR meter with right parameters?

 

[volker_muehlhaus]

center frequency of the antenna only 58KHz, so, you mean...I can measure the impedence of the antenna if I set LCR meter with right parameters?

Yes, you can.

 

[Barack]

thank you volker_muehlhaus but another queastion, measure the antenna, the parameter of LCR, how big measure voltage I have to set?
and the impedence of the antenna can I measure the capacitor, inductor, resistor with individual, then plus them together?

 

[volker_muehlhaus]

how big measure voltage I have to set?

This makes no difference.

and the impedence of the antenna can I measure the capacitor, inductor, resistor with individual, then plus them together?

Measure inductance and resistance at (or near) the operating frequency. The antenna tag is described by series R-L.

 

[biff44]

Raidation resistance models an "imaginary loss", and does not contribute to thermal noise. radiation resistance is in series with metal ohmic losses, ground losses, etc to form the total input resistance.

 

[Barack]

thank you for this post.:grin: