RLSA antenna having two orthogonal linear polarizations

Communications: radio wave antennas – Antennas – Slot type

Reexamination Certificate

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C343S770000

Reexamination Certificate

active

07061444

ABSTRACT:
The network antenna of the RLSA type in the form of a radial waveguide has a feed structure allowing simultaneous excitation of the antenna in two orthogonal linear polarizations. The feed structure, essentially placed to the rear of the antenna, consists of a circular waveguide placed at the centre of the radial waveguide and coupled to the latter by two circular slots for the excitation of the antenna in a first linear polarization and of a coaxial waveguide surrounding the circular waveguide and coupled to the radial waveguide by radial slots, the coaxial waveguide being excited by a ring-shaped waveguide placed coaxially on the outer periphery of the coaxial waveguide and coupled to the latter by slots distributed around the inner periphery of the ring for the excitation of the antenna in a second linear polarization orthogonal to the first linear polarization.

REFERENCES:
patent: 3032762 (1962-05-01), Kerr
patent: 3063049 (1962-11-01), Kelly
patent: 4716415 (1987-12-01), Kelly
patent: 5661498 (1997-08-01), Goto et al.
patent: 4212886 (1993-10-01), None
M. Ando et al: “A Linearly Polarized Radial Line Slot Antenns” IEEE Transactions on Antennas and Propagation, IEEE Inc. New York, US, vol. 36, No. 12, Dec. 1, 1988, pp. 1675-1680.
Copy of Search Report Dated Nov. 18, 2003.

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