Base station antenna for dual polarization

Details Base station antenna for dual polarization Base station antenna for dual polarization

1998-01-15

2000-06-06

Wong, Don

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343795, 343821, H01Q 2126

Patent

active

060724390

ABSTRACT:
An improved antenna system for transmitting and receiving electromagnetic signals comprising a backplane having a length and a vertical axis along the length. A plurality of dipole radiating elements project outwardly from a surface of the backplane. Each of the elements includes a balanced orthogonal pair of dipoles aligned at first and second predetermined angles with respect to the vertical axis, forming crossed dipole pairs. An unbalanced feed network extends along the backplane and connected to the radiating elements. A printed circuit board balun is attached to each of the dipoles. The antenna can also include a parasitic element positioned along the vertical axis such that primary electromagnetic fields induce currents on the parasitic element, these induced currents re-radiate secondary electromagnetic fields which cancel portions of the primary electromagnetic fields, thereby improving isolation.

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Brian Edward and Daniel Rees, "A Broadband Printed Dipole With Integrated Balun" Microwave Journal May 1987 (pp. 339-344).

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