Gatesair, Inc.

Onetastic S.r.l.

Gatesair S.r.l.

Carlo Bombelli

Silvio Coradi

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&#xb0;; 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 which are adapted to compensate for the non-ideality characteristics of the semiconductor used for making the line.

Method for making a wideband Doherty amplifier with reduced plan width and amplifier thereof

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:&#x2014;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 (d) 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;&#x2014;determining the maximum distance between the circuit branches in such a way as to avoid any undesired frequency values within the frequency range;&#x2014;setting a fourth impedance value of one of the two impedances;&#x2014;calculating a fifth impedance value of the other one of the two impedances, such that the impedance value of the circuit section is the third respective impedance value.

Method for transforming the impedance of a radio-frequency transmission line of a printed circuit and printed circuit thereof

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.

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Roncadelle, Italy

Carlo Bombelli