Abstract: The present invention relates to a planar antenna comprising a resonating slot 12 dimensioned to operate at a given frequency, the slot being realized on a substrate 10 and supplied by a feed line 13 in a short circuit plane in which it is located. The substrate has a variable thickness 10b. The invention can be used in wireless networks.

Abstract: A device, applicable to the field of wireless transmission, receives and/or transmits electromagnetic waves with radiation diversity. This device comprises, on a common substrate (3), at least one antenna of the slot type (1) formed by a closed curve, known as a slot antenna, electromagnetically coupled to a first supply line (6), and an antenna radiating parallel to the substrate (2), positioned inside the slot antenna and connected to a second supply line. The first and second supply lines are connected via a switching means to means to exploit the electromagnetic waves.

Abstract: The present invention relates to a planar antenna carried by a substrate comprising a slot in the form of a closed curve dimensioned to operate at a given frequency, supplied by a feeder line intersecting the slot at a point known as an excitation point, characterized in that at least two short circuits in parallel on the slot are positioned with respect to the excitation point so as to match the impedance to the excitation point and/or the polarization of the antenna.

Abstract: The present invention relates to a multiband planar antenna comprising, on a substrate having a ground plane, at least a first slot dimensioned for operation at a first frequency and a second slot dimensioned for operation at a second frequency, the two slots having a closed shape and being excited by a common supply line. Furthermore, the slots are coupled to the supply line such that the coupling with the first slot is implemented in an electrical plane of the supply line of a first type and the coupling with the second slot is implemented in an electrical plane of the supply line of a second type, the supply line having, at its free end, a control element comprising two states allowing the type of electrical plane at the coupling points of the line with the first and second slots to be modified, the slots being positioned with respect to the supply line such that only one of them radiates for a given state of the control element.

Abstract: The invention proposes an antenna operating in two frequency bands and having two separate ports. The invention is a printed antenna with slot produced on a ground plane. Said antenna consisting of a slot 1, said antenna having a first port produced by a first microstrip line 2, the coupling between the first line 2 and the slot 1 being produced at a first distance L1 from a closed end of the slot, and a second port produced by a second microstrip line 4, the coupling between the second line 4 and the slot 1 being produced at a second distance L2 from the closed end of the slot. The invention also pertains to a system of antennas which comprises at least two twin-port antennas.

Abstract: The invention proposes a primary feed providing an asymmetrical illumination compatible with an elliptical reflector and having a small space requirement. The invention uses a short rod to modify the radiation of an open waveguide section. The invention is an antenna comprising a radiating feed made up of a waveguide, one end of the waveguide forming a radiating aperture. The end forming the radiating aperture is fitted with a rod made of dielectric material, said rod being partly inserted in the waveguide. The rod is extended outside the waveguide over a length less than twice the guided wavelength and the section of the rod develops outside the waveguide differently in each of the planes.

Abstract: The present invention relates to an element of transition between a waveguide and a transition line on a substrate. The element of transition comprises a securing flange on the substrate, the flange being dimensioned so that at least, in the direction microstrip line, the width d of the flange is selected in such a manner as to shift the resonant modes away from the useful band. The invention is used particularly for circuits using SMD techniques at millimeter frequencies.

Abstract: The present invention relates to a radiating device intended to receive and/or transmit electromagnetic signals comprising at least two antennas connected by slot and having a common slot. Connection means enable at least one antenna to be connected to processing means of electromagnetic signals. The connection means include two connection lines connected to the processing means. The two lines are terminated by an open circuit and are coupled electromagnetically to the common slot of the two antennas so as to enable a phase difference to be introduced between the electromagnetic signals of the two antennas when the connection is switched from one line to the other by means of a switching device present on the connection lines.

Abstract: The invention proposes an antenna operating in two frequency bands and having two separate ports. The invention is a printed antenna with slot produced on a ground plane. Said antenna consisting of a slot 1, said antenna having a first port produced by a first microstrip line 2, the coupling between the first line 2 and the slot 1 being produced at a first distance L1 from a closed end of the slot, and a second port produced by a second microstrip line 4, the coupling between the second line 4 and the slot 1 being produced at a second distance L2 from the closed end of the slot. The invention also pertains to a system of antennas which comprises at least two twin-port antennas.

Abstract: The present invention relates to a planar antenna comprising a resonating slot 12 dimensioned to operate at a given frequency, the slot being realized on a substrate 10 and supplied by a feed line 13 in a short circuit plane in which it is located. The substrate has a variable thickness 10b. The invention can be used in wireless networks.

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 method for producing an antenna comprising a conductive wire, formed by a wire, made of a conductive material, whose path has a helical shape. In accordance with the invention, such a method is characterised in that a print is formed in relief on one side of an element of an electrically insulating material such that the helical shape is generated by depositing the conductive material in this print.

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 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 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 multiband planar antenna comprising, on a substrate having a ground plane, at least a first slot dimensioned for operation at a first frequency and a second slot dimensioned for operation at a second frequency, the two slots having a closed shape and being excited by a common supply line. Furthermore, the slots are coupled to the supply line such that the coupling with the first slot is implemented in an electrical plane of the supply line of a first type and the coupling with the second slot is implemented in an electrical plane of the supply line of a second type, the supply line having, at its free end, a control element comprising two states allowing the type of electrical plane at the coupling points of the line with the first and second slots to be modified, the slots being positioned with respect to the supply line such that only one of them radiates for a given state of the control element.

Abstract: The present invention relates to an electromagnetic wave transmission/reception source for a multireflector antenna of the Cassegrain type comprising longitudinal-radiation means operating in a first frequency band and an array of n radiating elements of the travelling-wave type operating in a second frequency band with the n radiating elements arranged symmetrically around the longitudinal-radiation means, the array and the longitudinal-radiation means having an approximately common phase centre, the array of n radiating elements being excited by a waveguide of polygonal cross section. The invention applies especially in satellite communication systems operating in the C-, Ku- or Ka-bands.

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 invention proposes a transition 105 between a microstrip technology circuit and a waveguide 103, the waveguide (103) being furnished with a probe 122 linked electrically to the microstrip circuit. The transition comprises at least one first resonant cavity 127 coupled by a first hole 124 placed level with the said plane. The transition furnished with the cavity 127 behaves as a bandstop filter. The transition 105 is placed in an outside unit 1 of a transmission system comprising a transmit circuit embodied in microstrip technology and an antenna of waveguide type. A transmit circuit comprises at least one local oscillator and the resonant cavity 127 is tuned to the frequency of the local oscillator.

Abstract: The invention reduces the size of waveguide circuits. The invention proposes to change the cross section of a waveguide in a curved part. Thus, a curved element according to the invention makes it possible at the same time to make a change in waveguide cross action.