Abstract: An omnidirectional antenna to equip a sonar, the antenna centered around a longitudinal axis and comprises an assembly of emission rings stacked along the longitudinal axis, each emission ring formed around the longitudinal axis. The emission rings are assembled in groups of ring, the antenna comprises at least two groups of rings and each group of rings comprises at least two rings, the inter-ring spacings between the rings of one and the same group and the inter-group spacings between two successive groups of rings chosen so as to optimize the emission bandwidth and the sound level.

Abstract: A compact omnidirectional antenna for dipping sonar comprises multiple elementary transmission rings formed around a longitudinal axis of the antenna and multiple hydrophones distributed around the longitudinal axis, the antenna intended to be dipped in water, the hydrophones separate from the elementary transmission rings, the hydrophones and the elementary transmission rings fixed in the antenna. The elementary transmission rings and the hydrophones are interlinked along one and the same height (H) measured along the longitudinal axis.

Abstract: An omnidirectional antenna to equip a sonar, the antenna centered around a longitudinal axis and comprises an assembly of emission rings stacked along the longitudinal axis, each emission ring formed around the longitudinal axis. The emission rings are assembled in groups of ring, the antenna comprises at least two groups of rings and each group of rings comprises at least two rings, the inter-ring spacings between the rings of one and the same group and the inter-group spacings between two successive groups of rings chosen so as to optimize the emission bandwidth and the sound level.

Abstract: An integrated antenna device comprises a protective casing of hydrodynamic shape delimiting an inner cavity and an upper fixing interface suitable for being fixed mechanically on a carrier structure, the device further comprises an antenna housed inside the inner cavity and fixed to the internal wall of the casing at the level of at least one fixing point, an assembly of cables comprising power supply and signals reception cables linked to the antenna. The protective casing is closed in a hermetic manner and traversed in a leaktight manner by the cables.

Abstract: A compact omnidirectional antenna for dipping sonar comprises multiple elementary transmission rings formed around a longitudinal axis of the antenna and multiple hydrophones distributed around the longitudinal axis, the antenna intended to be dipped in water, the hydrophones separate from the elementary transmission rings, the hydrophones and the elementary transmission rings fixed in the antenna. The elementary transmission rings and the hydrophones are interlinked along one and the same height (H) measured along the longitudinal axis.

Abstract: A sealed compressor comprises a motor pump unit, a hermetic casing and means of electrical connection, the motor pump unit positioned inside the hermetic casing, the connection means allowing the motor pump unit to be powered electrically through the hermetic casing, the connection means comprising an earth rod and at least two power supply terminals. The connection means comprise a mobile housing and a power supply cable, the housing arranged at the end of the cable, connection of the housing to the earth rod and to the power supply terminals achieved in a translational movement in a direction of insertion. Connection of the housing to the earth rod comprises non-return means that prevent the housing from moving in an opposite direction to the direction of insertion.

Abstract: The present invention relates to high-frequency antennas with high transmission power. The invention consists in making the backing layer of such an antenna with a heat-conductive foam and enables the transmission power to be appreciably doubled.

Abstract: The invention relates to high-frequency antennas with high transmission power. It consists in making the backing layer (201) of such an antenna with a heat-conductive foam. It enables the transmission power to be appreciably doubled.