Method and device for directional emission and reception of...

H - Electricity – 01 – Q

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H01Q 13/04 (2006.01) H01Q 25/04 (2006.01)

Patent

CA 2246724

The invention relates to a high-mode operating resonator, e.g. a coaxial wave-guide, wherein various oscillation modes of an electromagnetic field are coupled in and superimposed on each other. The mixed mode thus arising from the excitation field is used to excite an antenna, preferably a biconical antenna. The azimuthal emission characteristic of the electromagnetic wave emitted by the antenna has the same dependency as the azimuthal field distribution in the resonator. The emission characteristic has in particular, in the case of an azimuthal and anisotropic excitation field, privileged directions in the azimuthal emission. A change of direction of the maximum emission of the electromagnetic wave occurs through an additional change of the phase or amplitude relationships between the coupled electromagnetic field modes.

Dans un résonateur pouvant fonctionner dans des modes supérieurs, notamment un guide d'ondes coaxial, différents modes d'oscillation d'un champ électromagnétique sont injectés et superposés les uns aux autres. Le champ d'excitation à modes mixtes, ainsi obtenu, est utilisé pour exciter une antenne de préférence biconique. La caractéristique de rayonnement azimutale de l'onde électromagnétique émise par l'antenne présente la même dépendance que la répartition de champ azimutale dans le résonateur. En particulier, la caractéristique de rayonnement présente, dans le cas d'un champ d'excitation anisotrope azimutal, des orientations privilégiées dans l'émission azimutale. Une modification supplémentaire des relations de phase ou d'amplitude entre les modes des champs électromagnétiques injectés entraîne un changement d'orientation de l'émission maximale de l'onde électromagnétique.

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