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[Reply #15 on:]

Someone said me; "RFID reader's mhz is must be high" so I'm searching them. Is there any problem? If you have any idea or advice I'll be happy.

They were wrong.
You can do a car park entry system with an active transponder at any frequency.
That transmitter will allow you to make a transponder ( tag ) but will need one for every car and you need a receiver.

[Reply #16 on:]

Can anyone advice me active RFID reader which can be used 3-4 meters away reading?
I want to use it with Arduino Uno R3.
I need hep. SOS.

[Reply #17 on:]

Can anyone advice me active RFID reader which can be used 3-4 meters away reading

assuming you have googled
active rfid tags

What do you mean by advise you?
Do you want a list of tags and readers you can use?

http://www.activewaveinc.com/applications_parking_lots.php

http://www.technovelgy.com/ct/Technology-Article.asp?ArtNum=21

http://www.pacw.org/no-cache/issue/june_2011_issue/news/technology_news/rfid_radiofrequency_identification.html

[Reply #18 on:]

Yes, googled and learned how it works but couldn't find products which are suitable for Arduino usage.
If you say; "You can buy this active RFID reader and tags..", I'll google them and search similar ones.

[Reply #19 on:]

Yes, googled and learned how it works but couldn't find products which are suitable for Arduino usage.

The only readers that are not sutiable for an arduino are those with USB connections or fire wire. All the others are.

[Reply #20 on:]

I'm buying this one with active tags.
http://www.ebay.com/itm/RF40315T-x-Active-RFID-40-Meters-Transmitting-Module-/300070090192?pt=LH_DefaultDomain_0&hash=item45dd9235d0
Will I have a problem with Arduino?