ORIGINAL MESSAGE:

On 24 Jul 2006 00:45:39 -0700, "palaniappan chellappan"
wrote:

Hi all,
I am trying to do a loop antenna (HF - 13.56 Mhz - RFID Application),
I found people using air variable capacitors and mica variable
capacitors.
can i use ceramic capacitors ? will that affect the performance a lot ?
will that spoil the Q of antenna a lot ?

regards,
palani

------------ REPLY SEPARATOR ------------

You didn't give many details such as the bandwidth of the antenna, but
if you use the NP0 type ceramic capacitors you should be ok. Loops,
especially small ones, are notorious for narrow bandwidth and stable
caps are a must.

Bill, W6WRT