Reading and writing function test is normal, both universal card readers and mobile phones can read and write, including UID.
After receiving the cards, the customer
found that the card could not be issued normally.
The customer wanted us to find the cause,
but the reader for the project is inconvenient to provide.
It’s known to all that there are three major factors to judge a RFID product. Frequency, Q value and attenuation.
Using T8200Pro-G can test these three factors simultaneously.
|
Frequency |
13.734 MHz |
Normal(green) |
|
Attenuation |
-1.329 dB |
Normal(green) |
|
Q value |
31.182 |
Normal(green) |
|
Communication test result |
|
FAIL(red) |
|
14443A UID |
|
N/A(gray) |
|
Frequency |
123.423 KHz |
Normal(green) |
|
Attenuation |
-1.361 dB |
Normal(green) |
|
Q value |
9.558 |
Normal(green) |
HF Inlay performance problems
The frequency, Q value and attenuation tests can be displayed normally, but the dB value is found to be too small and the communication test fails. Based on experience and reasoning, it may be related to the size and design of the antenna.
New antenna design: Enlarge the size of the HF
antenna.
- Original antenna:
HF
and LF are arranged side by side with circular antenna.
- New
antenna:
HF
is replaced by a larger square antenna and place the LF antenna inside the HF
antenna.
|
Frequency |
14.174 MHz |
Normal(green) |
|
Attenuation |
-7.499 dB |
Normal(green) |
|
Q value |
36.308 |
Normal(green) |
|
Communication test result |
|
PASS（green） |
|
14443A UID |
0408xxxxxxxx（7bit） |
|
|
Frequency |
122.523 KHz |
Normal(green) |
|
Attenuation |
-1.741 dB |
Normal(green) |
|
Q value |
9.600 |
Normal(green) |
Customer feedback after receiving improvement:
Conclusion
Only measured frequency and general read and write for non - standard small card or micro tag is not enough!
Except frequency, Q value and attenuation are also the key parameters to measure the performance of label!
Designing antenna or verifying label performance must use professional testing tools!