| 摘要 |
A dipole antenna 10 comprises two dipole halves 12, 14 which extend away from each other and are parallel to an axis 13, where the dipole halves 12, 14 are spaced apart in a direction perpendicular to the said axis 13 such that the input impedance of the dipole 10 matches that of a feed line 34 connected to the dipole. The dipole antenna 10 maybe used in a crossed dipole formation where the dipole halves 12, 14 each comprise an L-shaped planar member projecting from a conductive base plane. Each of the dipole halves 12, 14 may have a hole in it and a stub projecting from its distal end. A feed line 34 may be directly electrically connected to and integrated with a dipole halve 12. The dipole halves 12, 14 may have a space between them in the range of 0.0015 g to 0.02 g with a length of g /4 where g is the mean operating wavelength of the dipole antenna. The dipole arrangement may be used in an antenna array which includes isolation means between crossed dipole elements. The antenna array may have antenna elements which operate at different frequencies and these antenna elements may have different spacing between other elements according to their intended operational frequency. The antenna may be used in mobile telecommunication systems to provide a good standing wave ratio performance over a wide bandwidth with good signal isolation. |
