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4. A microstrip line is constructed of a copper conductor and nylon phenolic board. The relative dielectric constant of the board material is 4.19, measured at 25 GHz, and its thickness is 0.4836 mm (19 mils). The line width is 0.635 mm (25 mils), and the line thickness is 0.071 mm (2.8 mils). Calculate the 11 Problems 493 a. Characteristic impedance Zo of the microstrip line b. Dielectric filling factor q c. Dielectric attenuateon constant ad d. Surface skin resistivity R, of the copper conductor at 25 GHz e. Conductor attenuateon constant a