CONTROLLED STRIP IMPEDANCE TRANSFORMER Russian patent published in 2020 - IPC H01P1/203 

FIELD: physics.

SUBSTANCE: invention relates to microwave. Summary: controlled impedance stripline transformer comprises dielectric substrate on lower surface of which there is a metal grounded base. On upper surface there are side screens connected with metal base by metalized holes. Between the side screens there are n sections of cascade-connected stepwise inhomogeneous strip lines having increasing width w_i (i = 1, 2, ..., n) from the impedance transformer input to its output and length. Sections of strip lines of the second and next stages are split into two parts with the same width with a longitudinal slot, the length of which is less than the total length of sections with numbers 2, 3, ..., n. Above the line sections with width w₂, w₃, ..., w_n there are additional dielectric substrates overlapping these sections. On the outer sides of the additional substrates there are control metal strips with width w₂, w₃, ..., w_n, which are separated by lengthwise crosswise gaps. Between lateral sides of control strips and side screens there are control elements, which are represented by capacitors or varicaps. Ends of the segment portions with a width w_n, which are the output transformer impedances bridged. High-resistance input of transformer is input end of section with width w₁, and low-ohm output - ends of section with width w_n.

EFFECT: invention can be used for matching circuits in a wide frequency band.

1 cl, 7 dwg