This security gate antenna adopts 3D sensing patent technology. It can promptly sense RFID tag omni-directionally within 3D sensing zoom, support ISO 15693 RFID labels, initiative and passive alarm modes. Under initiative alarm mode, there are AFI, EAS and AFI+EAS anti-theft modes for option. Security gate can be assembled densely, that is one entrance can up to 10set security gate abreast, its widest identifying width is 90cm.