Patent ID: 6744412
Filing Date: 2004-06-01
Classification: H01Q

Abstract:
An antenna, including a progressive-phase-omnidirectional excitation network and an absorber configuration, comprising:first, second, third and fourth dipoles successively spaced around a vertical axis; a signal port; a progressive-phase-omnidirectional (PPO) excitation network, coupled between the signal port and the four dipoles, including (a) a first quadrature coupler coupled to the signal port and coupled between the first and second dipoles to provide first dipole excitation of a first phase and to provide second dipole excitation of a quadrature phase, and (b) a second quadrature coupler coupled to the signal port and coupled between the third and fourth dipoles to provide third dipole excitation of a phase differing by 180 degrees from said first phase and to provide fourth dipole excitation of a quadrature phase relative to the third dipole; a ground plane section with a reflective surface positioned below the four dipoles; a cylindrical structure, having a reflective surface, coupled to the ground plane section and extending around the four dipoles; an absorber configuration having a serrated upper-edge portion extending around the four dipoles above the cylindrical structure and having radiation absorption properties.