Societe D'etude Du Radant

Contre Mesure Hyperfrequence C M H

Henri Sadones

Claude D Chekroun

Yves C Michel

In a radar, a protective radome is placed in front of a to-be-protected antenna. The antenna is made of several networks that are superimposed. At least one of the active networks can be controlled electrically in two distinct states A or B. In state A, the radome, which is placed in front of the antenna, is transparent for the radar operation frequency band and reflective outside that band. For state B, the radome is reflective for all radar frequencies. The invention especially protects the radar against jammers that transmit outside the radar operation frequency band, while providing for the total camouflaging of the radar when it is not being used.

Anti-sensing method and device for radar

The invention refers to the analysis of a very high frequency radiation beam of electromagnetic waves. According to the invention, a network of conductor wires is placed in the path of a beam to be analyzed, the wires being interrupted at intervals by switches. One controls the conducting state of a diode and one blocks the others and one makes the position of the diode vary electronically and sequentially in the conducting state. The return signal received on a sensor R is used by detecting the significant characteristics of that return according to the position of the diodes in the conducting state.

Method and device for analyzing a very high frequency radiation beam of

The invention relates to an adaptive spatial microwave filter for multipolarized antennas and the process of its application. According to the invention, the filter principally consists of two conjugated networks of lines L.sub.1, l.sub.1 ; L.sub.2, l.sub.2 ; . . . of sections of wires loaded with diodes D mounted in series and essentially symmetrically superposed. The lines are passed through by polarizing currents I.sub.1, I.sub.2 . . . which according to selected distribution enables attenuation at reception of certain secondary lobes of the antenna pattern. The invention applies in particular to the localization and neutralization of jammers.

Adaptive spatial microwave filter for multipolarized antennas and the

Process to attenuate or cancel certain side lobes of a microwave antenna pattern by using a network of parallel wires loaded with resistances that are adjustable at will, arranged as a filter in front of the antenna. Application of this process to the elimination of the effects of active or passive interferences, as well as to the localization of jammers. Adaptive filter for microwave antennas.

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Paris, France

Henri Sadones