13.56MHz RFID antenna design for car access system
I am in the process of building an RFID entry system for my car & house. I will be using this tag: http://www.indiegogo.com/projects/
I have the entry system working with an arduino and this RFID reader: http://imall.iteadstudio.com/proto
However, the read range is very poor and requires the tag to touch the antenna. I need a design for an antenna which I can build and then solder onto the reader in place of the stock antenna which can extend its read range to 2-3 inches. The antenna ideally will be placed in the drivers-side door.
Happy to provide any other information required on request.