Method for employing a rfid walk-through gate

A method for tag detection by using a walk-though gate (WTG), the method comprising:

• constructing a WTG structure including a first wall and a second wall, the first and second walls defining a walk though pass way between an entrance and an exit;
• positioning at least one sensor at the entrance and the exit of a cavity defined by the walk though pass way;
• positioning at least one first antenna facing toward an inside region of the WTG structure;
• positioning at least one second antenna facing away from the inside region of the WTG structure;
• connecting an RFID reader to the at least one first and second antennas;
• judging, via a judgement module, if an RFID tag is located inside or outside the walk though gate structure;
• and
• constructing curved surface structures in both the first and second walls of the WTG structure.