Adslinecalc's calculation of the equivalent electrical length of the strip line refers to the ratio of the mechanical length of the copper strip line placed in the middle of the dielectric between two conductive planes to the wavelength of the electromagnetic wave transmitted on the line by mathematical method according to the known number in the calculation of the advertising line. Advertising and advertising. S line & calc means advertising line calculation. Calculation: according to the known number, the unknown number is obtained by mathematical method. A stripline is a copper stripline placed in the middle of a dielectric between two conductive planes. Equivalence means the same utility. The electrical length is the ratio of the mechanical length (or geometric length) of the transmission line to the wavelength of the electromagnetic wave transmitted on the line. Therefore, the calculation of the equivalent electrical length of the strip line by adslinecalc refers to the ratio of the mechanical length of the copper strip line placed in the middle of the medium between two conductive planes to the wavelength of the electromagnetic wave transmitted on the line, which is obtained mathematically according to the known number in the calculation of the advertising line.