Abstract: This invention covers a phase shifter-equalizer circuit including a purely resistive impedance, a purely reactive impedance, at least one of which adjustable, and a phase inverter device, which permit to adjust in a continuous way the phase between the output current and the input current, while maintaining the amplitude of the output current constant and substantially equal to the amplitude of the imput current versus phase and group delay variations between the two currents. Furthermore, continuous phase adjustment is achieved by adjusting one only parameter of the circuit.

Abstract: It is described a process to obtain thin film lines by photolithography of thick resist and subsequent selective galvanic growth of gold which enables to obtain very thin lines (2-10 micron) with high definition, that is with nearly vertical walls and with a tolerance in the width of about 1 micron. Such results have been achieved by using polyimide as thick resist, by particular cure cycles of the same polyimide and by a particular dry etching of the polyimide layer to obtain seats in which afterwards the lines become grown.

Abstract: The invention relates to a driver for a semiconductor laser which makes it possible to obtain a high switching rate as well as bias and modulation current control. These objects are achieved with an asymmetric mirror current generator and current variation means using one transistor only.

Abstract: A thin film power coupler, in particular, a 3 dB and 90 degree power divider, is fabricated of lumped circuit elements. The main characteristics of the coupler is in having achieved the coupled inductances by mutual induction. Such an achievement has been obtained with 2 microstrip lines facing each other and wrapped in a square shaped spiral. Another important characteristic of the power coupler is the presence of a capacitor in the circuit which joins the two branches of the coupler, with sufficient tolerance to obtain the wanted coupling and to recover possible tolerances incurred by manufacturing the thin film inductors.

Abstract: A pin diode variable attenuator featuring decouping values higher than those achievable using the technique used so far, is described. This result has been achieved by implementing the line sections which the pin diodes are connected to with a characteristic impedance different than the characteristic impedance input and output to/from the attenuator.

Abstract: High-power transmitter valves are located in a housing through which a fan feeds a cooling air stream between an inlet point and an outlet point, the inlet air temperature being required to lie within a range set by the valve manufacturer. The device according to the invention, which is located outdoors, comprises a first duct connected to the inlet point of said housing and a second duct connected to the outlet point thereof. Both the first and second ducts are connected to the outside atmosphere, the first by way of a filter and the second by way of a throttle valve which enables a fraction of the air flowing through the second duct to be recycled to the first duct upstream of the filter, and which for this purpose is controlled by a temperature transducer located in the first duct downstream of filter.

Abstract: A directional coupler of the 3 DB and 90 degree branchline type with four ports. Four pairs of coupled lines of microstrip construction provide the connections between the ports. The first and third ports are opposite each other as are the second and fourth ports, with the first and third ports connected to associated circuits and the second and fourth ports unconnected.

Abstract: A station for the transmission and reception of electromagnetic waves (e.g. from a communication satellite in stationary earth orbit), operating in a multichannel band with two conjugate polarizations, includes a regenerative distortion compensator in a receiving waveguide branch and a predistorter in a transmitting waveguide branch, both controlled by a processor responsive to output signals from a subsequent i-f stage in which a distortion monitor measures cross-talk between the two polarizations on the basis of two central beacons extracted from the incoming message band.