| 摘要 |
A switchless combiner is described, comprising a circuit (32) having a delay line consisting of a constant-impedance transmission line (12,12') and a device (10) adapted to vary the electric length of said transmission line (12,12'), wherein said device (10) comprises a metallic body (14) with an outer wall (16) and an inner wall (22) adapted to define a cavity (20), said walls (16,22) being interrupted in a manner such as to define a slot (24), said cavity (20) and said slot (24) extending along at least a portion of the length of said device (10), wherein said cavity (20) comprises a first portion (21) having a first cross-section and a second portion (23) having a second cross-section which is greater than said first cross-section, said second portion (23) comprising a dielectric element (27) with a cutout (25) corresponding to said slot (24), said first (21) and second (23) portions extending in the longitudinal direction of said device (10) and said transmission line being positioned, inside said first portion (21) and inside said second portion (23), in said cutout (25) of said dielectric element (27), said dielectric element (27) being adapted to occupy the cavity (20) of said second portion (23), and comprising translating means (1 1) integral with said metallic body (14) and adapted to translate said dielectric element (27) on said circuit (32) in the longitudinal direction of said device (10). |
