Smart library Bookshelf Antenna is a high-performance antenna specially designed for library RFID smart bookshelves,which can read overlapping book tags (book thickness not less than 0.8CM;)at the same time.it can control the signal well to prevent to read books in the hands of readers outside the bookshelf. The combination of smart bookshelf antennas and our four-port,six-port.twelve-port and twenty-four-port high-power readers could realize a multi-layer structure of smart bookshelf products.