Abstract: The present invention relates to a radio frequency antenna (10) including an antenna array (12) operating at one wavelength and comprising: a powered dipole (14A) connected at an access point (15) to a radio frequency transmitter generating or receiving a wave at the wavelength, at least one coupled dipole (14C1, 14C2, 14C3) connected at an access point to a respective load (Z1, Z2, Z3), the powered dipole (14A) and each coupled dipole (14C1, 14C2, 14C3) including two strands extending from the access point (15), the access points (15) being arranged so as to form a polygon, the first strand of a dipole (14) extending along the second strand of a neighboring dipole (14) at a distance less than one tenth of the wavelength.

Abstract: A monopole wire-plate antenna that is reconfigurable in a frequency range of operation, comprising: a ground plane (1); a capacitive roof (2); a probe feed (3), which is electrically insulated from the ground plane (1), and which extends between the ground plane (1) and the capacitive roof (2) so as to electrically feed the capacitive roof (2); at least one shorting wire (4), which is arranged to electrically connect the capacitive roof (2) to the ground plane (1), and which is coated in a magneto-dielectric material (5) having a complex magnetic permeability, which varies as a function of a static magnetic field applied to the magneto-dielectric material (5).

Abstract: The invention relates to a directional antenna network adapted to operate in at least one predetermined frequency band, which comprises at least one pair of metal antennas (8,10) formed by a first metal antenna and a second metal antenna, the second metal antenna being sequentially rotated by a predetermined angle of rotation relative to the first metal antenna, a load circuit (6), with each metal antenna connected to said load circuit, and a monopole antenna (12), having a central position in the antenna network, connected to said load circuit (6). The metal antennas and the monopole antenna are arranged on a ground plane (4) and coupled, with the load circuit (6) being parameterized to provide radiation in which the monopole antenna (12) has a destructive contribution of a magnetic transverse radiation mode, whereby radiation by said at least one pair of metal antennas of selected circular polarization is obtained.

Abstract: A balun including first and second conductive tracks located vertically in line and at a distance from each other and having a same pattern.

Abstract: This antenna includes: a ground plane; a capacitive roof, parallel with the ground plane; a supply probe, which is electrically isolated from the ground plane and runs between the ground plane and the capacitive roof so as to supply the capacitive roof with electricity, the supply probe being intended to be connected to a transmission line; a set of shorting wires, which are arranged in parallel around the supply probe such that each shorting wire electrically connects the capacitive roof to the ground plane, each shorting wire being coated with a magneto-dielectric material.

Abstract: A compact antenna device has a ground plane at floating potential and at least one dipole antenna extending through the ground plane. The at least one dipole antenna has first and second strands extending on either side of the ground plane. A control circuit is arranged on the ground plane in order to control the at least one dipole antenna.

Abstract: A monopole wire-plate antenna that is reconfigurable in a frequency range of operation, comprising: a ground plane (1); a capacitive roof (2); a probe feed (3), which is electrically insulated from the ground plane (1), and which extends between the ground plane (1) and the capacitive roof (2) so as to electrically feed the capacitive roof (2); at least one shorting wire (4), which is arranged to electrically connect the capacitive roof (2) to the ground plane (1), and which is coated in a magneto-dielectric material (5) having a complex magnetic permeability, which varies as a function of a static magnetic field applied to the magneto-dielectric material (5).

Abstract: This antenna includes: a ground plane; a capacitive roof, parallel with the ground plane; a supply probe, which is electrically isolated from the ground plane and runs between the ground plane and the capacitive roof so as to supply the capacitive roof with electricity, the supply probe being intended to be connected to a transmission line; a set of shorting wires, which are arranged in parallel around the supply probe such that each shorting wire electrically connects the capacitive roof to the ground plane, each shorting wire being coated with a magneto-dielectric material.

Abstract: This device has a ground plane at floating potential; at least one dipole antenna, extending through the ground plane, and comprising first and second strands extending on either side of the ground plane; and a control circuit, arranged on the ground plane in order to control the or each dipole antenna.

Abstract: A negative impedance circuit including: a first and a second bipolar transistors having a common collector, a base of the first transistor being connected to an emitter of the second transistor; a third and a fourth bipolar transistors having a common collector, a base of the third transistor being connected with an emitter of the fourth transistor; and at least one first impedance formed of one or of a plurality of passive components coupling the common collector of the first and second transistors to the common collector of the third and fourth transistors, a base of the second transistor being coupled to the collector of the third and fourth transistors and a base of the fourth transistor being coupled to the collector of the first and second transistors.

Abstract: A negative impedance circuit including: a first and a second bipolar transistors having a common collector, a base of the first transistor being connected to an emitter of the second transistor; a third and a fourth bipolar transistors having a common collector, a base of the third transistor being connected with an emitter of the fourth transistor, and at least one first impedance formed of one or of a plurality of passive components coupling the common collector of the first and second transistors to the common collector of the third and fourth transistors, a base of the second transistor being coupled to the collector of the third and fourth transistors and a base of the fourth transistor being coupled to the collector of the first and second transistors.