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A dual-band antenna with pattern diversity designed by antenna coupled method, and arranged in a λ/2 transmission line, 108 mm, to improve the isolation of the proposed antenna is presented in this paper. The proposed antenna is consisted of folded monopole antenna with perpendicular patch, and a folded transmission line of half-wavelength from the edge of perpendicular patch extending and combining to the other monopole antenna. And the antenna coupled gap of monopole antenna and the length of λ/2 transmission line will make the isolation be changed. The dual-band antenna is fabricated by FR4 substrate. This size of proposed antenna is 70(L) × 10(W) × 7.1(H) mm3 to apply in handset device. The substrate of measurement, 7.1 mm, includes air, 5.5 mm, and FR4, 1.6 mm. And, the measured operating bands are 750 MHz to 960 MHz of lower band and 1750 MHz to 2400 MHz of higher band with S11 <;= -6 dB and S21 <;= -10 dB. The length of ground plane, 110 mm, can obtain a near 0.75λ pattern. In this paper, using a closed-end antenna jams with other antennas difficultly, but it will get lower total radiation efficiency. Then, the peak antenna gain and total radiation efficiency will be shown in this paper.