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[SOLVED] 125 Khz Coil antenna design

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guytoub

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Hello,
I want to built a 125khz coil antenna but i don't know how to calculate it.
do someone have any idea please?
i want to simulate i in CST

Thanks
 

125 kHz has become a frequency often used for RFID. Ordinarily a long wire suspended outdoors is recommended to pick up radio broadcasts at a distance.
If you're interested in RFID system, the link below relates to the same question as yours.

https://electronics.stackexchange.c...design-125khz-antenna-for-1-meter-rfid-reader

It states: "LF RFID is primarily near field inductive power transfer."
Which is saying electromagnetic waves are not a chief ingredient.

The discussion advises trial and error.
 

Good morning,
the object of my study is for RFID tag reading.
the idea is to make a coil to capture this frequency at 125 khz but that it is small.
I want to model it on CST or ADS. I know how to make miscrostrip antennas but I have never done this kind of study at low frequency.
Should I make a representation in R,LC?
if you have examples of study and modeling even on different frequencies I am interested.
 

Common practice is to tune a coil & capacitor tank circuit so it resonates at your desired frequency. Since you want high Q this is achieved with a high L:C ratio.

Selection of values depends on how much current is available to operate (or drive) the LC pair.
Say it's a few mA and 0.1 V. Suitable values to start with: 16 uH, 100 nF.

Simulation shows it has a pronounced peak at 125 kHz.
 

Common practice is to tune a coil & capacitor tank circuit so it resonates at your desired frequency. Since you want high Q this is achieved with a high L:C ratio.

Selection of values depends on how much current is available to operate (or drive) the LC pair.
Say it's a few mA and 0.1 V. Suitable values to start with: 16 uH, 100 nF.

Simulation shows it has a pronounced peak at 125 kHz.
Thanks ,

i tried it and it works well.
 
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