Dual band multimode coaxial tracking feed

H - Electricity – 01 – Q

Patent

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H01Q 5/00 (2006.01) H01Q 13/02 (2006.01) H01Q 13/06 (2006.01) H01Q 19/08 (2006.01)

Patent

CA 2423489

A dual band multimode coaxial antenna feed has an inner section of longitudinal hollow waveguide having first and second orthogonal mode transducers that interface first and second orthogonally polarized cylindrical waveguide TE11 mode signals lying in a first upper (e.g.,Ka) frequency band. An outer coaxial waveguide section has a Potter horn surrounding the inner waveguide section, which terminates at a polyrod. The outer section includes third and fourth orthogonal mode transducers that interface orthogonally polarized coaxial waveguide TE11 mode signals lying in a second lower (e.g.,X) frequency band. A tracking port coupled to the outer coaxial waveguide section provides an output representative of the difference pattern of the radiation profile produced by transverse electromagnetic TEM mode signals generated and propagating in the outer coaxial waveguide. A mode supressor in the outer waveguide section adjacent its two orthogonal mode transducers locally supresses TEM signals in their vicinity.

Une source primaire d'antenne coaxiale multimode à double bande présente une section intérieure de guide d'ondes creux longitudinal ayant un premier et un second transducteurs en mode orthogonal qui interfacent des premiers et seconds signaux en mode TE¿11? guides d'ondes cylindriques polarisés orthogonalement, se situant dans une première bande de fréquence supérieure (par exemple, Ka). Une section de guide d'ondes coaxiale extérieure présente un cornet Potter entourant la section de guide d'ondes intérieure qui se termine par une antenne cierge. La section extérieure comprend un troisième et un quatrième transducteurs en mode orthogonal qui interfacent des signaux en mode TE¿11? guides d'ondes coaxiaux polarisés orthogonalement, se situant dans une seconde bande de fréquence inférieure (par exemple, X). Un port de poursuite, couplé à la section de guide d'ondes coaxiale extérieure constitue une sortie représentative des modèles différentiels de profils de rayonnement produits par des signaux en mode TEM électromagnétiques transversaux générés et se propageant dans le guide d'ondes coaxial extérieur. Un suppresseur de mode dans la section de guide d'ondes extérieure, adjacente à ses deux transducteurs en mode orthogonal, supprime les signaux TEM dans leur voisinage.

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