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You often need to design a 50Ω transmission line of a certain type. [[RF.Spice A/D]] provides ten physical transmission line designer design tools. for:  * Microstrip Line* Coupled Microstrips * Stripline* Coupled Striplines* Coplanar Waveguide (CPW) Line* Finite-Ground CPW Line* Conductor-Backed CPW Line* Coaxial Line* Twin-Lead Line* Twisted-Pair Line The above line designers ignore the conductor and dielectric losses and calculate the physical dimensions of the line for a given value of the characteristic impedance Z0. For example, given a substrate with thickness h and relative permittivity ε_r, the "Microstrip Designer" calculates the microstrip width in mm for a given value of Z0 (50 Ohms by default). Some line type like CPW and coaxial line have more than one dimensional parameter that can be varied. For example, CPW has slot width (w) and center strip width (s), while coaxial line has inner and outer conductor radii. In such cases, the line designer dialog provides radio button options to fix one parameter and vary the other.