Abstract: The invention relates to an antenna source transmitting and receiving polarized microwaves, the source including a transducer for separating the transmission signals from the reception signals, the frequencies of the transmission signals being different from the frequencies of the reception signals. The connection between the transducer and the radiating element of the antenna is such that it maintains the polarization states of the signal received by the radiating element and of the signal transmitted to said radiating element. The transducer comprises a square-section waveguide, one end of which is connected to the radiating element, the other end being connected to the transmission path, the received signals being conveyed by the side faces of the waveguide. This source makes it possible to transmit and to receive in the enlarged C band, i.e. 3.4 GHz to 4.2 GHz on reception, and 5.85 GHz to 6.65 GHz on transmission.

Abstract: The invention relates to a transition between a ridge waveguide and a planar circuit on which a conductor is provided. The transition includes at least one conductive link connecting the end of said ridge to said conductor between two contact points. According to the invention, the contact points face a common access provided for putting the conductive link in place. It is thus possible to implement the contact points industrially, e.g. by means of a thermocompression machine.

Abstract: A pseudo-elliptical filter includes positively coupled resonant cavities, the signal input and the signal output of each cavity being at 90.degree. to each other. At least one retro-coupling of signal between two of said cavities is constituted by a waveguide. Applications include pseudo-elliptical filters operating in the millimeter band.

Abstract: A magnetic device couples a main conductor of a TEM line and a waveguide forming a .lambda.g/2 resonator and procuring the propagation of an electromagnetic wave. The main conductor is fixed to a wall of the waveguide and extended by a pin inside the waveguide. The device comprises a tuning screw penetrating into the waveguide near the free end of the pin and perpendicular to the pin and an iris around and centered on the pin. The iris is closed on the side on the wall and its interior volume forms a zone in which the wave of the associated magnetic field is evanescent. The median axis of the tuning screw is in the plane of the aperture of the iris.

Abstract: A band rejection filter for a microwave wave-guide formed of a wave-guide (11) and at least one short-circuited coaxial line. An inner conductor (17) and an outer conductor (19) are coaxial with the inner conductor (17) being a conducting rod extending a screw (12) and the outer conductor being at least in part a tapped hole (19) formed in the wall of the wave-guide (11). The screw (12) forms an adjustable short-circuit. The short-circuited coaxial line has a length slightly less than an odd multiple of a quarter wavelength corresponding to the central frequency of the frequency band to be rejected, so as to form an inductive susceptance. The end of the inner conductor (17) projects slightly into the wave-guide (11) to form a capacitive susceptance which is connected to the end of the coaxial line so as to form a resonator tuned to the central frequency of the band to be rejected.

Abstract: The invention relates to a phase-shifting combiner for electromagnetic waves, the combiner comprising at least one phase-shifting cell constituted by a hybrid coupler (12), an inlet transmission line (10), an outlet transmission line (11), and a loop transmission line (13) connected between the first inlet and the first outlet of the coupler (12), the inlet transmission line (10) being connected to the second inlet of the coupler and the outlet transmission line (11) being connected to the second outlet of the coupler. It is applicable, in particular, to telecommunications.

Abstract: An orthogonal polarization duplex send-receive microwave head comprising an elongate housing (10) provided at one end (26) with a longitudinal bore (25) forming a first waveguide and with a transverse bore (28) forming a second waveguide opening out into the first waveguide, and an antenna (44) which extends into the first waveguide, said microwave head being characterized in that said antenna (44) is a receive antenna which extends into said first waveguide at a location situated between the inside end of said first waveguide (25) and the location at which said second waveguide (28) opens out therein, and in that a transmit antenna (45) extends into the second waveguide at its free end, with said antennas being connected to respective coaxial accesses (41, 42) and with a metal plate (31) being disposed longitudinally in the first waveguide between two tranverse planes containing the two antennas (44, 45).

Abstract: An adjustable band filter comprising a conductive screening body (10, 11) made of two parts (10 and 11) joined to each other on either side of a separation plane (13), a cavity (12) inside said body, said cavity containing a half wavelength resonant line (15) carried on a first face (16) of a suspended substrate (14), the substrate being end-coupled and received in grooves (17) made in the walls of the first portion (10). The first face (16) of the substrate (14) divides the cavity (12) into two asymmetrical volumes in such a manner as to enable the passband of said filter to be modified.

Abstract: The present invention relates to an E-plane type wideband composite filter comprising a conductive screening body (11, 12) having an elongate cavity (14) therein with a blade cut into a ladder shape disposed longitudinally therein. Said body comprises two portions held against each other on either side of a separation plane along which said ladder (15) is disposed, with two irises (16, 17) being disposed transversely at the inlet and at the outlet of said cavity (14), each closing off a portion thereof.

Abstract: This highly reproducible stripline band-pass filter comprises, between its two leads (A and B), n halfwave resonators (1-7) connected in series. Suitable capacitors (C0-C7) provide a powerful coupling between the successive elements of the series circuit. Quarterwave resonators (10, 11, 70, 71) each having one end connected to the series circuit provide a steep-edge amplitude/frequency response at the limits of the pass-band of the hyperfrequency, wideband filter so obtained.

Abstract: A filter comprising a metal case having a metal base and a lid forming a guide of any section but under cut-off, that is to say which does not allow guided propagation. Cylindrical dielectric resonators are in contact with the metal securing base and the resonators resonate then in the TM010 mode. For frequency tuning of the filter, the distance between the bottom of the lid and the ends of the dielectric resonators supported by the base is variable. The invention applies more especially to tuneable band-pass filters.

Abstract: Filter comprising a rectangular waveguide extended at both ends by rectangular guide-to-rectangular guide couplers and provided with lateral secondary guides. In order to enable the use of cylindrical secondary guides without introducing unwanted resonances, said couplers are given, at their ends, rectangular internal cross sections both the height and width whereof are smaller at the end coupled to the primary guide than at the end remote from the primary guide.