Abstract: The present invention relates to a radiation diversity antenna consisting of radiating elements of the slot-line type coupled electromagnetically to a feed line, in which the radiating elements (1,2,3,4,5,1a,1b) have a tree structure, each radiating element having a length equal to k?s/2 where k is an identical or different integer from one element to the next and ?s is the guided wavelength in the slot-line constituting the radiating element with at least one radiating element comprising a switching means (d1,d2,d3,d4,d?1) positioned in the slot-line constituting the said radiating element in such a way as to control the coupling between the said radiating element and the feed line (6) as a function of a command. The invention applies chiefly to wireless transmissions.

Abstract: The present invention relates to a device for the reception and/or the transmission of electromagnetic signals comprising at least one means of reception and/or of transmission of electromagnetic signals, consisting of an antenna of the slot type and a feed line coupled electromagnetically with the slot of the antenna so as to connect the means of reception and/or of transmission of electromagnetic signals to means of utilization of the signals, the feed line being coupled electromagnetically with the slot at two points chosen such that the electromagnetic waves exhibit a circular polarization

Abstract: The present invention relates to a multiband planar antenna consisting of at least one resonator formed of an element having a closed shape made on a substrate and dimensioned so as to operate in its fundamental mode at the resonant frequency of the lowest band. The resonator is fed by a feed line in such a way as to operate in all the higher modes. The resonator comprises means for modifying the resonant frequencies of the various modes in such a way as to cover the bands concerned.

Abstract: The invention relates to a device for receiving and/or transmitting electromagnetic signals comprising three annular slots (20, 21, 22) which are tangent in pairs at two points P1 and P2. These slots are supplied by two supply lines (23, 24) so as to produce a line/slot transition. One of the lines 23 passes through the point P1 while the other line 24 passes through the point P2, the two lines being connected via a T-shaped junction at a common port 1. A diode 25 or 26 is mounted at the free end of each line, making it possible to simulate a short circuit or an open circuit at the end of one of the lines and an open circuit or a short circuit at the end of the other line.

Abstract: The present invention relates to a multiband planar antenna comprising a first slot 1a dimensioned (R1) to operate at a first frequency f1 and fed by a feed line 12 positioned (Im1) in such a way that the slot lies in a short-circuit plane of the feed line, and at least one second slot 11 dimensioned (R2) to operate at a second frequency f2, the second slot being fed by the said feed line (Im2).

Abstract: The present invention relates to a device for receiving and/or emitting signals comprising at least two means for receiving and/or emitting electromagnetic waves of the slot antenna type and means for connecting the said receiving and/or emitting means to means for exploiting the signals, the means for receiving and/or emitting electromagnetic waves being symmetric with respect to a point, and the connection means consisting of supply lines coupled electromagnetically to the slots of the slot antennas, which are connected on one side to a common supply line which is in a plane passing through the point of symmetry, and on the other to an electronic component enabling a short circuit or an open circuit to be simulated at the end of one of the lines and an open circuit or a short circuit to be simulated at the end of the other line.

Abstract: The invention relates to a dual-band planar antenna formed by at least one slot of closed shape fabricated on a printed substrate having a perimeter equal to k?f, and two supply lines supplying power to the slot via two accesses separated by (2m+1)?f/4, where ?f is the guided wavelength in the slot and k and m integers greater than 0, the slot comprising means modifying the operating frequency, one of the supply lines being situated on the said means. The invention is especially applicable to antennas used in domestic wireless networks (IEEE802-11a or Hyperlan 2 standards.

Abstract: The present invention relates to a device for receiving and/or transmitting electromagnetic waves with radiation diversity. This device comprises, on a common substrate, at least one antenna of the slot type formed by a closed curve, known as a slot antenna, electromagnetically coupled to a first supply line, and an antenna radiating parallel to the substrate, positioned inside the slot antenna and connected to a second supply line, said first and second supply lines being connected via a switching means to means for exploiting the electromagnetic waves. The device can be applied, in particular, in the field of wireless transmissions.

Abstract: The present invention relates to a device for receiving and/or transmitting signals comprising an assembly of n means for receiving and/or transmitting waves with longitudinal radiation of the printed slot-antenna type, where n is an integer greater than or equal to one, and an excitation means of the microstrip-line type coupled to at least one slot line. The present invention is characterized in that it comprises a switching device which acts by controlling the coupling between the microstrip line and at least one slot line.

Abstract: The present invention relates to a planar antenna carried by a substrate including a slot (11) consisting of a closed curve dimensioned in order to operate at a given frequency and fed by a feed line (12) positioned so that the slot lies in a short-circuit plane of the feed line. This antenna includes, in parallel on the slot 11, at least one switching means 13 capable of assuming a closed state or an open state so as to modify the operating frequency band of the planar antenna. This antenna is particularly suitable for domestic wireless networks.

Abstract: The present invention relates to a device for the reception and/or the transmission of multibeam signals of the type comprising:

Abstract: The present invention relates to a dielectric resonator antenna comprising a block (10) of dielectric material of which a first face intended to be mounted on an earth plane is covered with a metallic layer (11). According to the invention, at least one second face perpendicular to the first face is covered with a partial metallic layer (12) having a width less than the width of this second face.

Abstract: Compact, planar antenna made on a substrate comprising an annular slot which is dimensioned to operate at a given frequency and which is placed in a short-circuit plane of a line via which the antenna slot is fed. A second slot feed line is symmetrically disposed with respect to the first line in the line short-circuit plane common to them. Each of the lines, furnished with a port, is connected to a switching facility so as to allow the feeding of the antenna through one or the other of the two ports.

Abstract: The present invention relates to a device for the reception and/or the transmission of signals comprising at least two means of reception and/or of transmission of waves, the said means consisting of a slot type antenna (10, 11), and means for connecting at least one of the said means of reception and/or of transmission to means of utilization of the multibeam signals.

Abstract: The present invention relates to a wideband antenna consisting of a dielectric resonator 1 or DRA mounted on a substrate 2 with an earth plane.

Abstract: The present invention relates to a multiband planar antenna comprising a first slot 1a dimensioned (R1) to operate at a first frequency f1 and fed by a feed line 12 positioned (Im1) in such a way that the slot lies in a short-circuit plane of the feed line, and at least one second slot 11 dimensioned (R2) to operate at a second frequency f2, the second slot being fed by the said feed line (Im2).

Abstract: The present invention relates to a device for receiving/transmitting electromagnetic waves with omnidirectional radiation of the type comprising: a first set (100a, 100b, 100c, 100d) of means for receiving/transmitting waves with longitudinal radiation of the printed antenna type, the said means being arranged in order to receive a wide azimuthal sector and at least a second means (104) for receiving/transmitting waves with transverse radiation of the printed antenna type, the second means having radiation complementary to the radiation of the first means, and means (103) capable of connecting in emission the said first and second wave receiving/transmitting means. The invention is especially applicable to domestic networks.

Abstract: Planar antenna carried by a substrate comprising an annular slot, which is dimensioned to operate at a given frequency and which is fed via a line (2), such as a microstrip line, in a short-circuit plane of which the slot is situated. The annulus formed by this slot (1a), is deformed as indentations in at least one zone of the plane in which the electric field is a minimum for the given frequency and a given mode, this making it possible to obtain a lengthening of the slot perimeter with respect to an annular slot (1), of corresponding circular shape, without surface extension of the substrate zone wherein the slot is made.

Abstract: The present invention relates to a planar antenna carried by a substrate including a slot (11) consisting of a closed curve dimensioned in order to operate at a given frequency and fed by a feed line (12) positioned so that the slot lies in a short-circuit plane of the feed line. This antenna includes, in parallel on the slot 11, at least one switching means 13 capable of assuming a closed state or an open state so as to modify the operating frequency band of the planar antenna. This antenna is particularly suitable for domestic wireless networks.

Abstract: The present invention relates to a device for the reception and/or the transmission of electromagnetic signals comprising at least two means of reception and/or of transmission of electromagnetic signals of the slot-fed antenna (11a, 11b, 11c, 11d) type and means of connection for connecting at least one of the said means of reception and/or of transmission to means of utilization of the multibeam signals, in which the means of connection consist of two feed lines (12, 13) connected by a connection element to the utilization means (P), the two lines being coupled electromagnetically with the slots of the slot-fed antennas, each line terminating in a switching element (14, 15) arranged in such a way as to simulate, as a function of a monitoring signal, an open circuit or a short circuit at the extremity of one of the lines and a short circuit or an open circuit at the extremity of the other line so as to obtain different radiation patterns.