PN5180 Antenna Matching

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PN5180 Antenna Matching

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Draxter
Contributor II

Hello,

I try design PCB Antenna for the PN5180 but i have not a lot of experiences with RF circuits. I watched and read tutorials how to design NFC Antenna. I don't know if the antenna is properly designed for the PN5180.

I used NXP NFC Antenna Tool to design circuit. The app gave me a below results:

design_pcb_antenna.png

 

After That I assembled circuit and measure. My antenna has 3-turns. I used NanoVNA V2 for measured antena coil. Results:

La = ~1.48uH @13.56MHz,

Ra = ~2.5R @13.56MHz,

Ca = ~1 - 2pF (?)

I used RFSim99 tool for tuned antenna. After tuned the curcuit looks like this:

antenna_circuit_after_tunned.PNG

 The NanoVNA shows:

Return Loss: -15.66dB
SWR: 1.45
Reflection power: ~2.7%
Z =  36.4R @13.56MHz

DSC_0935.jpg

 

DSC_0939.jpg

 

 

Is the antenna matching result good for PN5180?

 

 

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1 Solution
1,311 Views
fangfang
NXP TechSupport
NXP TechSupport

Hello,

 The matching seems no problem. But One may refer to the video  testing it.

URL: https://www.nxp.com/video/nfc-antenna-design-5-test-qualification:ANTENNA-TEST-QUALIFICATION-VIDEO.

Hope it help you. Have a nice day.

 

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4 Replies
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gabrielcuellar
Contributor I

Hi Draxter, you should use NXP-NFC-Reader Antenna Tuning.xls.

Must achieve measurement for PN5180
Z = 20R @13.56MHz for best transfer.

1- Measure your antenna with NanoVNA without circuit only antenna (Be careful with the calibration with the wire to measure), and obtain the R and L parameters (C not yet)

2-In these values in the NXP-NFC-Reader Antenna Tuning.xls (Attention in this) must reach the value indicated in the "C0 Calculated" field is very important.

3- Assemble your circuit and measure with the NanoVNA, then adjust the R L C values of the antenna in the simulation until you get a shape and values similar to those you read in reality.

4- You must in these values obtained from this "antenna" in the file NXP-NFC-Reader Antenna Tuning.xls and recalculate.

5- At this point you should have the final values to match at Z = 20 ohm 13.56Mhz

If step 5 didn't work for you, there may be something wrong, like a bad calibration or some value in the file that wasn't loaded correctly.

You should get this graph in the simulation and in reality

rec.PNG

Example in my case

ValoresFinalesGenerados.PNG

Note: Unconnect the soldering iron for add a change in your board if you have the nanovna connected.

Hope it help you. Have a nice day.

1,084 Views
Draxter
Contributor II

The circuit works but the maximum distance is only about 2-3cm. How Can I increase distance up to 7-8cm?

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1,306 Views
Draxter
Contributor II

Thank you for the reply and advice.

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1,312 Views
fangfang
NXP TechSupport
NXP TechSupport

Hello,

 The matching seems no problem. But One may refer to the video  testing it.

URL: https://www.nxp.com/video/nfc-antenna-design-5-test-qualification:ANTENNA-TEST-QUALIFICATION-VIDEO.

Hope it help you. Have a nice day.

 

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!
- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
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