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This paper presents the design and development of a compact dual linearly polarized aperture coupled microstrip patch antenna array at S-band for RFID reader applications. The 2/spl times/2 array uses two symmetric dog-bone shaped coupling aperture. The prototype array yields 14.6 dBi peak gain, 36/spl deg/ half-power beam width (HPBW) in both E and H-planes, 28 dB cross-polarization levels and an isolation better than 35 dB between the two polarization at the designed frequency bandwidth. These performances make the antenna very much suitable for RFID reader applications.