DIFFERENTIAL TRANSMISSION LINE WITH COMMON MODE NOTCH FILTER

摘要

A differential transmission line with a common mode notch filter includes adjacently arranged, repeating differential transmission line pair sections. The sections have lengths that are each equal to half of an electric wavelength of a lowest frequency of a common mode electromagnetic wave to be suppressed during transmission of an electric signal over the differential transmission line. Each section includes a pair of conductors separated from one another by a spacing. The width of each conductor and the spacing between the conductors of each section vary over the length thereof according to a same pattern such that at every point over the length of each section a differential mode impedance of the differential transmission line is identical. A common mode impedance of the differential transmission line changes periodically in accordance with the lengths of the sections.

主权项

1. A differential transmission line with a common mode notch filter, comprising:
a plurality of adjacently arranged, repeating differential transmission line pair sections, the sections having lengths that are each equal to a fraction of an electric wavelength of a frequency of a common mode electromagnetic wave to be suppressed during transmission of an electric signal over the differential transmission line, each section comprising a pair of conductors separated from one another by a spacing, wherein a width of each conductor and the spacing between the conductors of each section vary over the length thereof according to a pattern such that at every point over the length of each section a differential mode impedance of the differential transmission line is equal, and wherein a common mode impedance of the differential transmission line changes periodically in accordance with the lengths of the sections.