Abstract: A method for making a wideband Doherty amplifier with reduced plan width, adapted to transport a radio-frequency signal at a frequency value comprised within a frequency range defined between a minimum frequency value and a maximum frequency value, the amplifier including: a signal source adapted to generate an input signal; a hybrid coupler or a splitter network adapted to receive the input signal and divide it into first and second output signals phase-shifted by 90°; a carrier amplifier adapted to receive as input the first output signal; a peak amplifier adapted to receive as input the second output signal; an output network arranged between the carrier and peak amplifiers and a delivery node adapted to be connected to a load, the output network including a recombination node adapted to receive the signals output by the carrier amplifier and the peak amplifier, and a transmission line implemented as a printed circuit track applied to an insulating substrate, wherein capacitors are inserted on the track wh

Abstract: A method for transforming the impedance of a radio-frequency transmission line of a printed circuit from a first impedance value to a second impedance value, the radio-frequency transmission line being adapted to transport a radio-frequency signal at a frequency value comprised in a frequency range defined between a minimum frequency value and a maximum frequency value, wherein the following steps are envisaged:—dividing the radio-frequency transmission line into a plurality of circuit sections each one of the circuit sections including a first and a second impedance connected in parallel with each other by two circuit branches placed at a maximum distance (dmax) from each other, wherein the circuit sections have respective third impedance values that gradually increase, respectively decrease, from the first impedance value to the second impedance value;—determining the maximum distance between the circuit branches in such a way as to avoid any undesired frequency values within the frequency range;—setting a

Abstract: A method for making a wideband Doherty amplifier with reduced plan width, adapted to transport a radio-frequency signal at a frequency value comprised within a frequency range defined between a minimum frequency value and a maximum frequency value, the amplifier including: a signal source adapted to generate an input signal; a hybrid coupler or a splitter network adapted to receive the input signal and divide it into first and second output signals phase-shifted by 90°; a carrier amplifier adapted to receive as input the first output signal; a peak amplifier adapted to receive as input the second output signal; an output network arranged between the carrier and peak amplifiers and a delivery node adapted to be connected to a load, the output network including a recombination node adapted to receive the signals output by the carrier amplifier and the peak amplifier, and a transmission line implemented as a printed circuit track applied to an insulating substrate, wherein capacitors are inserted on the track wh

Abstract: A method for transforming the impedance of a radio-frequency transmission line of a printed circuit from a first impedance value to a second impedance value, the radio-frequency transmission line being adapted to transport a radio-frequency signal at a frequency value comprised in a frequency range defined between a minimum frequency value and a maximum frequency value, wherein the following steps are envisaged: —dividing the radio-frequency transmission line into a plurality of circuit sections each one of the circuit sections including a first and a second impedance connected in parallel with each other by two circuit branches placed at a maximum distance (dmax) from each other, wherein the circuit sections have respective third impedance values that gradually increase, respectively decrease, from the first impedance value to the second impedance value; —determining the maximum distance between the circuit branches in such a way as to avoid any undesired frequency values within the frequency range; —setting

Abstract: A switchless combiner includes a circuit having a delay line consisting of a constant-impedance transmission line and a device adapted to vary the electric length of said transmission line, the device including a metallic body with walls defining a cavity, the walls being interrupted to define a slot, the cavity and the slot extending along at least a portion of the length of the device, the cavity including a first portion having a first cross-section and a second portion having a second cross-section which is greater than the first cross-section, the second portion having a dielectric element with a cutout corresponding to the slot, the first and second portions extending in the longitudinal direction of the device and the transmission line being positioned, inside the first and second portion, in the cutout, the dielectric element occupying the cavity of the second portion, and having an element to translate the dielectric element on the circuit in the longitudinal direction of the device.

Abstract: A transmission line, in particular of the rigid type and for a radiofrequency power application, includes: a first conductor having a tubular shape; a second conductor, concentrically and coaxially positioned inside said first conductor; a dielectric, in particular consisting of air, positioned between the first conductor and the second conductor; a connector having a body adapted to be coupled to a terminal tract of the first conductor, wherein the connector includes at least one first connection element adapted to be inserted, at least partially, into a seat formed in one end of the second conductor, in particular the at least one first connection element including a substantially tubular first portion from which a plurality of first elastic tabs extend. The second conductor includes a second connection element at least partially positioned in the seat, the second connection element being adapted to be coupled to the first connection element by inserting it into a cavity of the first connection element.

Abstract: A switchless combiner includes a circuit having a delay line consisting of a constant-impedance transmission line and a device adapted to vary the electric length of said transmission line, the device including a metallic body with walls defining a cavity, the walls being interrupted to define a slot, the cavity and the slot extending along at least a portion of the length of the device, the cavity including a first portion having a first cross-section and a second portion having a second cross-section which is greater than the first cross-section, the second portion having a dielectric element with a cutout corresponding to the slot, the first and second portions extending in the longitudinal direction of the device and the transmission line being positioned, inside the first and second portion, in the cutout, the dielectric element occupying the cavity of the second portion, and having an element to translate the dielectric element on the circuit in the longitudinal direction of the device.

Abstract: A method for generating a variable delay in an electromagnetic signal that crosses a main transmission line includes: coupling to the main transmission line a secondary transmission line terminated at both ends by respective variable-reactance circuit elements, wherein the main transmission line and the secondary transmission line are immersed in the same dielectric medium at a distance from each other; simultaneously varying a reactance value of the variable-reactance circuit elements; selecting the reactance value by varying physical and electrical parameters of the main transmission line and of the secondary transmission line, so as to obtain, on the main transmission line, an absorption peak at an absorption frequency higher than a predetermined working frequency of the main transmission line, and an adaptation peak at a frequency lower than the transmission frequency, the adaptation peak corresponding to the predetermined working frequency.

Abstract: An amplifier in Doherty configuration includes a circuit (32) having a delay line consisting of a constant-impedance transmission line (12) and a device (10) adapted to vary the electric length of the transmission line (12). The device (10) includes a metallic body (14) with an outer wall (16) and an inner wall (22) adapted to define a cavity (20). The walls (16,22) define a slot (24).

Abstract: A method for synchronizing in time a plurality of transmitters (T1-T7) belonging to a single frequency network, the transmitters (T1-T7) being adapted to distribute a radio frequency signal over a territory, includes: identifying, for each transmitter of the plurality of transmitters (T1-T7), at least two transmitters (T1-T5; T6,T7) whose catchment area (B1-B7) includes at least one common catchment area (B12,B23,B34,B45; B67), and associating the at least two transmitters (T1-T5; T6,T7) with a subset of transmitters (S1; S2); identifying, within the subset of transmitters (S1; S2), one reference transmitter (TX) and at least one secondary transmitter (TS); determining, for each secondary transmitter (TS), a respective time offset with respect to the reference transmitter (TX) on the basis of time references contained in the radio frequency signal transmitted by the reference transmitter (TX) and received by the secondary transmitter (TS); adjusting the transmission parameters of the secondary transmitter (TS