A dual-polarized cross-dipole antenna with wide beam and high isolation for base station

In this paper, a dual-polarized cross-dipole antenna with wide beam and high isolation is designed and analyzed for base station. The proposed antenna consists of two planar cross dipoles with four square patches, two L-shaped microstrip lines, two ground plates, four parasitic patches, and a reflector. The square patches are placed between the center of cross dipoles to couple with L-shaped microstrip lines. By introducing the parasitic patches, the wide beam can be realized. The measured results show that the proposed antenna achieves an impedance bandwidth (|S-11| < -10 dB) of about 18.7% (1.9-2.35 GHz) and an isolation better than 30 dB. A measured gain of 5.7 dBi and a half-power beamwidth over 120 degrees at the center frequency are obtained. Furthermore, the size of the proposed antenna is only 0.5 lambda(0) x 0.5 lambda(0) x 0.22 lambda(0)(lambda(0)is wavelength at the center frequency).