Dassault Electronique

Thales

Pierre Nicole

Gaelle Lissorgues

Patrick Sangouard

Alain Phommahaxay

Gaelle Bazin

Paul Bildstein

The present invention relates to an electromagnetic signal power limiter and its design method. The power limiter for an electromagnetic signal includes at least one transmission line for the signal. The transmission line is made up of a number of passive micro-diodes with ballistic electron transport. The micro-diodes are distributed on the transmission line, and are implemented in a controlled atmosphere. The invention applies notably to radiofrequency or hyperfrequency waves received by detection and communication devices.

Electromagnetic signal power limiter and method of designing the power limiter

A frequency translator includes two multipliers which receive one and the same high-frequency signal on first inputs in quadrature with respect to one another, and one and the same low-frequency signal on second inputs also in quadrature with respect to one another. Each multiplier comprises a pair of elements whose capacitance can be varied in a controlled manner, jointly and in opposite senses, connected in parallel. The respective outputs of the two elements of each pair are combined additively, considering their phase opposition, in order to form the outputs of the two multipliers which supply a summer.

Low-consumption frequency translator

A receiver device is intended to detect a beam of electromagnetic entry signals of a known geometry, arriving at a variable entry angle of incidence. It comprises an optical lens, comprising at least one aspherical surface capable of correcting the geometry of an incident beam according to a correction formula chosen in accordance with the entry angle of incidence, for transforming it into an incident beam and applying it to a quadratic detector. This tends to suppress the divergences of the energy received by the detector cording to the angle of incidence, and makes it possible to render substantially constant the signal-to-noise ratio of the detection and the detected signal, irrespective of the entry angle of incidence of the incident entry beam.

Device for receiving electromagnetic signals with an energy correction

The first receiver element includes a detector element subdivided into first and second detector subelements each having a photosensitive section of a general elongate rectangular shape and disposed longitudinally opposite the radiation emitted by the first emitter element, the first and second detector subelements being disposed next to each other on their longer sides, with their substep chosen to be equal to, at most, strictly half the step of the first emitter element. An electronic receiving channel is assigned to the first or second detector subelement. Main switching means electrically connect the first or the second detector subelement to the electronic receiving channel according to a predetermined reception condition relating to the signals received by the said first and second detector subelements.

Optoelectronic installation for the interconnection of electronic

In a method of transmitting an electromagnetic signal in an optical fiber a polarized optical base signal is generated and input at a first and of an optical fiber, an optical signal emerging from the fiber after the base signal has passed through it is recovered at a second end of the fiber; this emergent signal is processed by electro-optical modulation with the electromagnetic signal which is to be transmitted and polarization conversion is effected, and the optical signal modified in this way is reinput to the said second end of the fiber; an optical return signal emerging from the fiber after the modified optical signal has passed through it is recovered at the first end of the optical fiber and this is analyzed in order to determine the characteristics of the electromagnetic signal.

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Saint Cloud, France

Pierre Nicole