[SI-LIST] Re: PCB Trace Antenna

Boopathy
It sounds like you are making a smartcard reader antenna. These are normally 
tuned circuits as Istvan mentioned.

Therefore, your resonance frequency will depend on the loop inductance and your 
chosen parallel capacitance. Once the size and the Q of the circuit have been 
decided you know what inductance you ideally want. Then you can decide whether 
you have a single or multiple turn loop. If you look in the ISO standards for 
RFID / smartcards then there are several examples of standard reader circuits. 
Presumably, your reader will have to be ISO compliant anyhow, so they are worth 
a look at.

Regards

Andrew

Boopathy,

:Not knowing the RF system parameters you have
:to achieve, just based on the stated frequency,
:you probably want to create a tuned loop antenna. 
:In this case the trace impedance matters less,
:in fact you may want to increase it as much
:as possible. More will matter the size
:(and orientation) of loop and the number of turns.


:regards,

:Istvan novak
:SUN Microsystems

Boopathy J. wrote:

>Content-Type: text/plain;
>       charset="us-ascii"
>Content-Transfer-Encoding: quoted-printable
>HI,
>
> We are designing HF card Reader  at f =3D 13.56MHZ.
>
>we need to implement the Antenna In PCB  traces. As I haven't worked =
>much on
>
>RF PCB design, I would like to know how to implement it &
>
>how to determine the Trace length & impudence for 13.56MHz.
>
>=20
>
>=20
>
>Thanks In advance
>
>=20
>
>Regards,
>
>Boopathy J
>
>=20
>
>
>
> 
>

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