Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
2005-03-01
2005-03-01
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
Wave guide type
C343S776000, C333S125000, C333S137000
Reexamination Certificate
active
06861997
ABSTRACT:
A parallel plate septum polarizer used in low profile, dual polarized, antenna applications such as satellite communications from a moving vehicle. The polarizer allows a wide waveguide to be fed from two thinner waveguides. Each thin waveguide operates with one propagating mode. These modes have the same field structure, wave velocity and wave impedance. Three waveguide modes can propagate in the wide guide. Two modes are desirable and are used to transmit or receive dual polarized signals. They have different field structures, wave velocities and impedances. The polarizer allows each mode in the thin guides to couple to both the desired modes in the wide guide. At the same time there is very little coupling with each other and with the undesired third mode in the wide guide. There is also very little reflection of the incident modes from the polarizer junction.
REFERENCES:
patent: 4395685 (1983-07-01), Davies et al.
patent: 5061037 (1991-10-01), Wong et al.
patent: 6577207 (2003-06-01), Volman
Le Hoang-anh
Schaap Robert J.
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