uhf rfid

Hello guys, i have a project automatic door for cat, that when the cat is near 20cm or 30cm from the door, then the door will open. So im going to use rfid, i try to use rfid passive disc tag, but then im confuse about rfid reader that can read at a long range, after searching at google i found...

I bought this antenna for my Sparkfun Simultaneous Reader, but I don't understand which jumper will do what function. The antenna didn't come with datasheet and I can't find it on the Internet. I tried connecting different jumpers and tried to make sense what jumper will do what, but can't...