RFID antenna design.

[Boki]

Hi All,

I am modifing a RFID antenna.

The sample board work well, however, we did a same board by ourself
but the result is bad.

The sample board work range is about 10cm.

My board is about 1 cm.

The big different is our circuit do not use the large capacitor as
sample board.

I am thinking that the capacitor is for huge current using when RFID
send out power to read tag.

So, the problem should be the capacitor. ( I am trynig to change it to
test )

However, beside this capacitor, I heard there is no Banul filter
there, and no consider to the 3/4 lamda issue.

Could you please advice what are them ? and how should I get it work
better ?

P.S I have only baseband (ADC) EE knowledge background.

Appreciate!

Best regards,
Boki.

 

[Wimpie]

Hi All,

I am modifing a RFID antenna.

The sample board work well, however, we did a same board by ourself
but the result is bad.

The sample board work range is about 10cm.

My board is about 1 cm.

The big different is our circuit do not use the large capacitor as
sample board.

I am thinking that the capacitor is for huge current using when RFID
send out power to read tag.

So, the problem should be the capacitor. ( I am trynig to change it to
test )

However, beside this capacitor, I heard there is no Banul filter
there, and no consider to the 3/4 lamda issue.

Could you please advice what are them ? and how should I get it work
better ?

P.S I have only baseband (ADC) EE knowledge background.

Appreciate!

Best regards,
Boki.

Hi Boki,

To enable readers to give useful feedback, I think you should provide
some additional information (frequency, antenna type, chip, maybe your
circuit/layout and evaluation board circuit/layout, etc).

Best regards,

Wim
PA3DJS
www.tetech.nl

 

[Boki]

Hi Boki,

To enable readers to give useful feedback, I think you should provide
some additional information (frequency, antenna type, chip, maybe your
circuit/layout and evaluation board circuit/layout, etc).

Hi Win,

2.45GHz.
It is a print board antenna.
It seems we don't need to use Balun filter for RFID, right ?

Best regards,
Boki.