Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1987-07-27
1988-10-11
LaRoche, Eugene R.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333113, 333135, H01P 1213, H01P 518
Patent
active
047774576
ABSTRACT:
A directional coupler is provided which has an appropriately dimensioned principle waveguide with a frequency dependent reactive boundary interior surface such that the principle waveguide is suitable to simultaneously: (i) support, without depolarization, effective propagation of first signals in a high frequency band at a HE11 mode with greater concentration of energy near the axis of the principle waveguide than near the interior surface and no effective propagation of first signals at any unwanted mode, and (ii) support, without depolarization, effective propagation of second signals in a lower frequency band at a EH11 mode having a greater concentration of energy near the interior surface of the principle waveguide than near the axis and no effective propagation of second signals at any unwanted mode. Four identical secondary waveguides are placed symmetrically at equal radial intervals about the outside perimeter of the principle waveguide with the longitudinal axis of each of the secondary waveguides running parallel to the longitudinal axis of the principle waveguide. A plurality of coupling units are disposed at longitudinal intervals along the principle waveguide with each coupling unit comprising four aperture-like structures interconnecting a respective one of the secondary waveguides and the principle waveguide for exchanging energy in the first signals between the secondary waveguides and the principle waveguide. This structure provides a directional coupler for separation of signals in the first and second frequency bands while preserving their polarization characteristics.
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Ghosh Subir
Prata, Junior Aluizio
LaRoche Eugene R.
Lee Benny
Telecomunicacoes Brasileiras S/A - Telebras
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