H - Electricity – 01 – P
Patent
H - Electricity
01
P
333/10
H01P 1/213 (2006.01) H01P 5/18 (2006.01)
Patent
CA 1216640
ABSTRACT DIRECTIONAL COUPLER FOR SEPARATION OF SIGNALS IN TWO FREQUENCY BANDS WHILE PRESERVING THEIR POLARIZATION CHARACTERISTICS. The invention relates to a directional coupler configured in a corrugated waveguide for separation of signals in two bands of frequencies while maintaining their polarization characteristics of any arbitrary nature unaltered in each band. By virtue of the reactance boundary condition, the principal waveguide supports propagation of HEll hybrid mode in the higher frequency band and HEll hybrid mode in the lower frequency band. These modes are characterized by concentration of energy near the axis in the case of HEll hybrid mode and near the boundary wall in the case of EHll hybrid mode. This principal waveguide does not allow, by reason of its size and reactance boundary condition, the propagation of unwanted higher order modes in the two bands of interest. Furthermore, the principal waveguide has means of communicating energy with four identical secondary waveguides which are disposed on the perimeter of the principal waveguide running parallel to the axis of the said waveguide such that a pair formed by two secondary waveguides placed in diametrically opposite positions, is orthogonal to similarly formed second pair. The means of communicating energy between the principal and secondary waveguides is provided by a periodically arranged coupling units in sets of four per transverse cross-section of the principal and secondary waveguides such that in each transverse plane the four coupling units are in coinciding disposition with the secondary waveguides. The coupling units are an arrangement of aperture like structures which interconnect the principal and secondary waveguides. The separation of the high frequency signal through band selective coupling with well defined directivity is achieved by virtues of, first, a close agreement of phase propagation constant between the modes in the principal and secondary waveguides in the high frequency band, secondly, an accurately maintained constant spacing between the coupling units that provides a 90° phase change between any two successive coupling units for the propagating modes in the high frequency band and, lastly, evanescence or very low phase change constant for the low frequency band in the secondary waveguides. The preservation of polarization characteristics over two large bandwidths is obtained by restraining propagation of unwanted modes in the principal waveguide.
466183
Ghosh Subir
Junior Aluizio Prata
Gowling Lafleur Henderson Llp
Telecomunicacoes Brasileiras S/a-Telebras
LandOfFree
Directional coupler for separation of signals in two... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Directional coupler for separation of signals in two..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Directional coupler for separation of signals in two... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1226868