ABSORBING FILTER-TRANSFORMER Russian patent published in 2020 - IPC H03H7/09 

FIELD: electricity.

SUBSTANCE: invention relates to selective transforming circuits of absorbing type and can be used in various receiving-transmitting radio equipment operating up to UHF range. In particular, it can be input part of high-power amplifiers, by means of which due to absorption at low frequencies of parasitic excitations, their stability during matching impedances of transistors with standard resistances, differing from each other by high transformation ratios, increases. Absorbing filter-transformer comprises four capacitors 46–49, three inductive elements 50–52 and two resistors R and r elements 53 and 54, which differ from each other in n-fold: R/r=n>1, where n is transformation ratio equal to ratio of wave resistances of paths at input Z₀ and output Z. At that L₁ and L₂=L₁/n – inductances of elements 50, 51 have magnetic coupling with close to unit by its coefficient: where M is mutual inductance of elements 50 and 51, and capacitances of elements 46, 47 form electrical connections between similar clamps of inductive elements 50 and 51. With such electrical and magnetic links are given ratios of capacity C₁, C₂ elements 48, 49 and C₃ elements 46, 47 and inductance L₃ of element 52, as well as calculating values of total capacitances C and nC, which provides expansion in times operating frequencies range, and matching of active resistances, differing from each other by high transformation ratio.

EFFECT: absorbing filter-transformer is proposed.

1 cl, 8 dwg