Circuit and Method for Generating A Variable Delay in an Electromagnetic Signal Crossing Said Circuit, in Particular for Use in A Doherty-Configured Amplifier

摘要

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.

主权项

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