ANTENNE CASSEGRAIN INVERSEE POUR RADAR A FONCTION MULTIPLE

• Main Author: JEAN-MICHEL BRUCKER ET BERNARD ESTANG
• Format: Patent
• Language: French
• Published: 07.10.1983
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; ELECTRICITY

LA PRESENTE INVENTION EST UNE ADDITION AU BREVET PRINCIPAL ET CONCERNE UNE ANTENNE CASSEGRAIN INVERSEE A ROTATION DE POLARISATION.LE MIROIR POLARISEUR UTILISE SE COMPOSE DE DEUX OU PLUSIEURS ELEMENTS REFLECTEURS-POLARISEURS ARTICULES AUTOUR DE CHARNIERES PERPENDICULAIRES A LA DIRECTION D'ELARGISSEMENT DESIREE. UNE NAPPE N COMPRENANT DES FILS METALLIQUES PARALLELES 100 RECOUVRE L'ENSEMBLE DES ELEMENTS. POUR CHAQUE ELEMENT E, E UN FILM METALLIQUE 105, 104 EST SEPARE DE LA NAPPE N PAR UNE PREMIERE COUCHE DIELECTRIQUE 103, 102 ET D'UNE LANGUETTE METALLIQUE 108, FIXEE AU FILM 105 ET EN CONTACT ELECTRIQUE AVEC LE FILM 104, PAR UNE DEUXIEME COUCHE DIELECTRIQUE 107, 106.LA PRESENTE INVENTION EST APPLICABLE AUX RADARS A FONCTION MULTIPLE. An inverted Cassegrain antenna utilizing polarization rotation. The polarizer-reflector or mirror utilized comprises two or more polarizer-reflector elements joined together around hinges perpendicular to the widening direction required. A sheet comprising parallel metal wires covers the whole of the elements. For each element, a metal film is separated from the sheet by a first dielectric layer. Each hinge is formed, on one side, by the flexible sheet of metal wires which straddles the gap between elements. The other side of the hinge includes a second dielectric layer backed by a rigid metal strip, also straddling the gap. One end of the metal strip is fixed to the metal film of one adjacent element while the other end of the metal strip is in moveable electrical contact with the metal strip of the other adjacent element. The antenna is particularly applicable to multiple function radars.