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Coax Impedance Calculator. Calculate the impedance of a coaxial transmission line. Notes: *Optimal D/d ratio for breakdown voltage is 2.718. *Optimal D/d ratio for power transfer is 1.65. *Optimal D/d ratio for minimum attenuation is 3.59. *Equation from Brian C. Wadell, “Transmission Line Design Handbook”. Coplanar_Waveguide_Calculator.php 12064 Bytes 26-05-2021 05:38:25 Coplanar Waveguide Impedance Calculator ( Bottom layer as well as adjacent copper is ground ). 35mm. The antenna fed with coplanar waveguide, makes the antenna working frequency band has a good impedance matching by adjust the width of the feeder (w f) and the gap (s 0). Fig. 2. configuration of dual-band antenna It is found that the impedance bandwidth of the proposed design can be improved by adjusting the bottom side of.