AMPLIFIER IN DOHERTY CONFIGURATION COMPRISING A DEVICE FOR VARYING THE WORKING FREQUENCY AND METHOD THEREOF

摘要

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). The cavity (20) includes a first portion (21) having a first cross-section and a second portion (23) having a second cross-section which is greater than the first cross-section, the second portion (23) includes a dielectric element (27) with a cutout (25) corresponding to the slot (24), the first (21) and second (23) portions extending in the longitudinal direction of the device (10) and the transmission line being provided, inside the first portion (21) and inside the second portion (23), in the cutout (25) of the dielectric element (27), the dielectric element (27) occupying the cavity (20) of the second portion (23), and including a translator (11) adapted to translate the dielectric element (27) on the circuit (32) in the longitudinal direction of the device (10).

主权项

1. An amplifier in Doherty configuration, comprising:
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, wherein said device comprises a metallic body with an outer wall and an inner wall adapted to define a cavity, said walls being interrupted in a manner such as to define a slot, said cavity and said slot extending along at least a portion of the length of said device, wherein said cavity comprises a first portion having a first cross-section and a second portion having a second cross-section which is greater than said first cross-section, said second portion comprising a dielectric element with a cutout corresponding to said slot, said first and second portions extending in the longitudinal direction of said device and said transmission line being provided, inside said first portion and inside said second portion, in said cutout of said dielectric element, said dielectric element being adapted to occupy the cavity (20) of said second portion, and in that it comprises translating means integral with said metallic body and adapted to translate said dielectric element on said circuit in the longitudinal direction of said device.