Provided is a dual polarization antenna realized by using four inverted
F-type radiators and a Radio Frequency Identification (RFID) reader
employing the dual polarization antenna. The dual polarization antenna
includes a ground plate and four inverted F-type radiators set up on the
ground plate. Currents of the same phase are fed to the first and second
inverted F-type radiators each other. Currents of an inverted phase are
fed to the third and fourth inverted F-type radiators each other. The
four inverted F-type radiators form an angle of 90.degree. with one
another. The first and second inverted F-type radiators radiate electric
wave of vertical polarization and the third and fourth inverted F-type
radiators radiate electric wave of horizontal polarization. Since the
dual polarization antenna has excellent orthogonal and isolation
characteristics, the antenna can extend a transmission distance between
the reader and the tag and improve a communication quality.