Abstract: The invention relates to a miniature microwave component having: a microwave chip (18, 60, 140) encapsulated in an individual package (61) for surface mounting. A metal base (80) mounts the chip in the package via its rear face. The base has an aperture (82). At least two access ports are provided for the communication of electrical signals between the inside and the outside of the package. A contactless microwave access port (62), by electromagnetic coupling at the aperture in the base, ensures transmission of coupling signals at a working frequency F0. A subharmonic access port (110) via a contact, inputs, into the integrated circuit, a subharmonic frequency F0/n of the working frequency F0. The chip includes, among its electrical conductors, a coupling electrical conductor (96) connected to the electronic elements of the chip. The coupling conductor is placed at the contactless microwave access port (62) in order to transmit microwave signals by electromagnetic coupling at the working frequency F0.

Abstract: The invention relates to a miniature microwave component having: a microwave chip (18, 60, 140) encapsulated in an individual package (61) for surface mounting. A metal base (80) mounts the chip in the package via its rear face. The base has an aperture (82). At least two access ports are provided for the communication of electrical signals between the inside and the outside of the package. A contactless microwave access port (62), by electromagnetic coupling at the aperture in the base, ensures transmission of coupling signals at a working frequency F0. A subharmonic access port (110) via a contact, inputs, into the integrated circuit, a subharmonic frequency F0/n of the working frequency F0. The chip includes, among its electrical conductors, a coupling electrical conductor (96) connected to the electronic elements of the chip. The coupling conductor is placed at the contactless microwave access port (62) in order to transmit microwave signals by electromagnetic coupling at the working frequency F0.

Abstract: The invention relates to millimetric packaged electronic components for applications at high frequencies greater than 45 GHz. According to the invention, to facilitate the design of a system including MMIC chips working at these frequencies, it is proposed to use packages containing one or more chips, these packages making it possible to work at these frequencies and including two types of port: a port with transition by contactless electromagnetic coupling providing a connection with an antenna at the high working frequency F via a waveguide; and a port with microstrip or coaxial line type transition enabling a connection at a subharmonic frequency F/N (preferably N=6 or 4 or, if necessary, 3) of the working frequency.

Abstract: The invention relates to millimetric packaged electronic components for applications at high frequencies greater than 45 GHz. According to the invention, to facilitate the design of a system including MMIC chips working at these frequencies, it is proposed to use packages containing one or more chips, these packages making it possible to work at these frequencies and including two types of port: a port with transition by contactless electromagnetic coupling providing a connection with an antenna at the high working frequency F via a waveguide; and a port with microstrip or coaxial line type transition enabling a connection at a subharmonic frequency F/N (preferably N=6 or 4 or, if necessary, 3) of the working frequency.

Abstract: A system including a first station (1) known as a beacon and at least one second station (2) known as a badge, each station having a transmission channel with an antenna and a reception channel with an antenna.To allow multiplex exchanges, using simultaneous transmission and reception, the two antennas (6, 11) (13, 15) in any given station are decoupled by cross-polarization but antennas which communicate with each other (6, 13) (11, 15) have compatible polarization.Applications to identification systems using microwave transmission.

Abstract: In order to increase the sensitivity and range of a system for the exchange of data by microwaves between a fixed station, or reader, and a mobile station, or badge, the modem of the badge includes an oscillator. A single transistor works, under a first bias, as a detector of the wave transmitted by the reader and demodulates this wave, and then, under a second bias, it works as an oscillator and modulates the response transmitted by the badge. Applications to the exchange of data at a distance.

Abstract: This active antenna is incorporated in the terminal station of a system for data exchange with a central station, by the modulation of a microwave carrier. The terminal station is of the chip card type. The modem of the active antenna is constituted by a transistor, the bias current of which is switched over from a low value at demodulation to a high value at modulation. The switch-over is obtained by a circuit with three resistors (R.sub.d, R.sub.gd, R.sub.g), which themselves have their values switched over by two transistors parallel connected with the resistors, these transistors being controlled by two signals emitted by the control circuit of the terminal station. The active antenna can be applied to long-distance data exchange, for example in the remote management of toll-charge systems, remote cash dispensing, localization of moving bodies etc.

Abstract: In a system for the exchange of data by microwaves between a fixed station and a mobile station or portable badge, the information bit rate is limited, in the standby state, by the low power consumption of the badge and the high output impedance of the modem. To increase the information bit rate of the modem of a badge, the information processing circuit associated with the modem sends the modem an activation signal to reduce its output impedance. The means implemented are transistors that switch over the load of the detector transistor or of the amplifier transistor.

Abstract: The disclosure relates to the field of data exchange by microwaves between a fixed station, or reader, and a mobile station, or badge. To achieve economy in the energy consumption of the badge, which has a "chip card" format, its input circuit or modem connected to the antenna does not transmit the modulated signal towards the reader. It reflects, in varying degrees, the carrier transmitted by the reader. The modulation of the reflection coefficient of the antenna is obtained by variation of the gate-source junction capacitance, which it itself related to the variation of the gate-source bias voltage of the input transistor of the modem. Application to remote-control toll-gates, remote money transactions and security checks.

Abstract: The disclosure concerns a microwave amplifier. To improve the efficiency of an amplifier having a field-effect transistor, an input quadripole and an output quadripole, the voltage applied to the gate is limited to a deviation between the pinch-off voltage V.sub.P and the positive maximum gate voltage V.sub.GS, using a diode of a second order harmonic reverse feedback circuit. Application to microwave circuits.

Abstract: An ultrahigh-frequency oscillator. To double the frequency of an oscillator having a single field-effect transistor (10), whose fundamental frequency is adjusted by an impedance of gate (13) and an impedance of source (15), a filter (16+17) is mounted between the drain of transistor (10) and the ground. This filter, formed by a self-induction coil (16) in series with a varactor (17) is adjusted to the fundamental frequency: it assures the rejection, and favors the generation of the second harmonic, at double frequency. Application to ultrahigh-frequency sources.

Abstract: The invention relates to an ultra-high frequency oscillator operating in the X band. The oscillator circuit comprises a common gate-connected field effect transistor. The source connected tuning circuit comprises a variable capacitor of the varactor type controlled by a voltage and a choke in parallel. The control voltage is decoupled from earth by a capacitor. According to the invention, the transistor, the varactor and the capacitor are integrated into the same box or case in the form of a micromodule. The capacitor acts as a base for the transistor and the varactor, which are welded in juxtaposed manner. The length of the connection between the varactor and the source of the transistor has a minimum value, which makes it possible to broaden the linear frequency band as a function of the control voltage.

Abstract: The invention relates to an ultra-high frequency oscillator (11-14 GHz) having a plurality of transistors, stabilized on at least one of their electrodes by a microstrip line coupled to a dielectric resonator. The oscillator according to the invention groups the transistors on the periphery of an insulating substrate, which centrally supports a single dielectric resonator common to all the transistors. The microstrip lines have two end portions, which are not coupled and are parallel to the field lines of the resonator, and a coupled central portion, perpendicular to the field lines. The transistors and microstrip lines are coplanar. The output is by a coaxial cable at the center of the substrate or by a microstrip line coplanar to the substrate.