Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1995-10-19
1998-10-06
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343789, 343795, 343872, H01Q 2126
Patent
active
058183973
ABSTRACT:
A circularly polarized antenna has an open reflector box, an array of crossed dipoles, and a single binary feed network. The open reflector box is formed of conductive material, has a ground plate and four side walls defining an opening, and has an input port for receiving an input signal. The single binary feed network is disposed within the open reflector box, is connected to the input port, and has a microstrip transmission line spaced from the ground plate. The microstrip transmission line has conductive bars mounted parallel to the ground plate and spaced therefrom forming an air dielectric low loss microstrip. Each pair of crossed dipoles has a first dipole comprising two downwardly bent radiating elements arranged at an angle with respect to the ground plate, and has a second dipole comprising two straight radiating elements arranged parallel to the ground plate. Each pair of crossed dipoles also has a pair of phase loop connectors and standoffs for respectively connecting an associated downwardly bent radiating element of the first dipole to a corresponding straight radiating element of the second dipole for providing circular polarization in an axial direction. One downwardly bent radiating element is connected to the ground plate, and another downwardly bent radiating element is connected to a respective conductive bar of the single binary feed network, for providing a circularly polarized horizontal beamwidth pattern having a horizontal width determined by the angle of the downwardly bent radiating elements with respect to the ground plate.
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Powell Charles M.
Yarsunas George D.
Le Hoanganh T.
Radio Frequency Systems Inc.
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