Re: toll road RFID antenna

I want to know what type of antenna is used in TOLL ROAD RFID applications working in this frequency range: 2350-2450MHz...

also if anyone can provide me with the specifications of this prticular antenna,like length and width of the patch, length ,width and thickness of substrate and dielectric constant value...

Also I may need a simulated antenna file on HFSS..

thanx

Added after 6 minutes:

kindly reply with ur suggestions..I need them really badly...thanks

They are usually a phased array of patches. Many such antennas today have the patches fed through slots excited by a trace extending beyond the slot. This is a multilayer board, but it separates the transmission line layer from the radiating layer so both can be independently optimized.

can i have the dimensions of this whole thing?