Abstract: An elementary microstrip antenna includes a stack of layers, stacked in a direction z, the stack comprising: a first conductive radiating element of disc shape having a first centre, an axis in the direction z and passing through the first centre being called the central axis; a coupling assembly configured to couple an exciting device and the first radiating element, the coupling assembly comprising: a first slot comprising a centre called the slot centre located on the central axis; a second slot comprising a centre coincident with the slot centre, and substantially perpendicular to the first slot, the first and second slots each comprising circularly arcuate ends on the same circle centred on the slot centre; the slots and the stacked layers being configured so that a transverse footprint of the elementary antenna is disc-shaped.

Abstract: The present disclosure relates to a bituminous binder including bitumen and at least two additives making it possible to reduce the manufacturing, processing and compacting temperatures of mixes and asphalts, the first additive being a Tall Oil derivative, alone or in a mixture, and the second additive being a monoester of a mixture of fatty acids. The disclosure also relates to low-temperature methods for the preparation of the mixes and asphalts obtained from the binder containing additives. The disclosure finally relates to the use of the binder containing additives in order to produce mixes and asphalts at lower temperatures, and the use of these mixes or asphalts, in particular in road applications, for sub-base courses, base courses, foundation courses, surface courses such as binder courses and/or wearing courses.

Abstract: The disclosure relates to cold asphalt coatings, in particular cold-poured asphalt coatings. The cold asphalt coatings according to the disclosure include one or more polymerized fatty acids. The cold asphalt coatings, prepared using a bitumen emulsion, have a pre-breakage mixing time that imparts good workability thereto. The cold asphalt coatings, and particularly cold-poured asphalt coatings, have increased cohesion that enables the same to be used under high-speed traffic. Finally, the cold asphalt coatings have good mechanical resistance.

Abstract: A multiple-beam electronic scanning antenna including an array of phase-shifters (2, Dij). The N simultaneous beams are obtained in N directions by a law of excitation (fij) applied to each computed phase-shifter (Dij) by summing the phase laws &psgr;1, &psgr;2, . . . &psgr;k, . . . &psgr;N associated respectively with each 1, 2, . . . k, . . . N order direction and by applying the resultant phase-shift (&psgr;tij) to the phase-shifter, without applying the resultant amplitude modulation (&rgr;ij). The multiple-beam electronic scanning antenna especially is applicable to uniquely phase-controlled antennas in satellite or terrestrial communications requiring simultaneous communications with several variable sites.