Thomson Licensing

Institut Francais De Recherche Pour L'exploitation De La Mer (ifremer)

Institut Francais De Recherche Pour L'exploitation De La Mer

François Le Pennec

Dominique Lo Hine Tong

Jean-Philippe Coupez

Christian Person

Serge Pinel

Hector Fabian Guarnizo Mendez

Ronan Apprioual

Christian Gac

Raymond Jezequel

The present invention relates to an underwater radio frequency antenna able to radiate in an underwater or equivalent propagation medium. It comprises a hollow conducting tube forming a resonant cavity, said conducting tube having an open end and a closed end, means of excitation of said resonant cavity which area able to be fed with signals and are arranged in such a way that the resonant cavity emits an electromagnetic radiation through said open end, at least one layer of dielectric material filling at least partially said resonant cavity so as to close the open end of the resonant cavity and render said cavity leaktight in relation to the underwater medium and to allow said electromagnetic radiation to pass through.

Underwater radio frequency antenna

The present invention relates to a mixer for signals at different frequencies comprising a network of diodes formed by a pair of diodes mounted in an anti-parallel manner, the first linking point of the diodes being connected to the ground, the second linking point being connected to the ports of transmission/reception signal paths and to the port of a local oscillator path at different frequencies. An impedance matching network for dual-mode use is connected in series in the diode network between the first linking point connected to the ground and the anode of one of the diodes of the diode network. A filtering network is connected between the second linking point and each of the ports of the transmission/reception paths and of the local oscillator path.

Dual-mode mixer

Growing community of inventors

Porspoder, France

François Le Pennec