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 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 and a system are described for controlling and stabilizing in time, as temperature changes, the frequency of a signal generated by a controllable oscillator (3), the method includes the steps of: measuring the frequency of the signal generated by the controllable oscillator (3) by using a first signal, whose duration is proportional to the length of a delay line (5) includes at least a first (7) and a second (9) delay line portions arranged in series and having a first (L1) and a second (L2) lengths, respectively; applying a frequency correction to the signal generated by the controllable oscillator (3) if the difference in frequency between the signal and the desired frequency value exceeds a predetermined threshold; providing the first portion of the delay line (5) by coupling a conductive material to a first dielectric material having a first negative gradient of its dielectric constant as a function of temperature; providing the second portion (9) of the delay line (5) by coupling or another cond

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 and a system are described for controlling and stabilizing in time, as temperature changes, the frequency of a signal generated by a controllable oscillator (3), the method includes the steps of: measuring the frequency of the signal generated by the controllable oscillator (3) by using a first signal, whose duration is proportional to the length of a delay line (5) includes at least a first (7) and a second (9) delay line portions arranged in series and having a first (L1) and a second (L2) lengths, respectively; applying a frequency correction to the signal generated by the controllable oscillator (3) if the difference in frequency between the signal and the desired frequency value exceeds a predetermined threshold; providing the first portion of the delay line (5) by coupling a conductive material to a first dielectric material having a first negative gradient of its dielectric constant as a function of temperature; providing the second portion (9) of the delay line (5) by coupling or another cond

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