Pertinent dimensions for the transmission line shown in Figure 13.2 are b = 3 mm and d = 0.2 mm. The conductors and the dielectric are nonmagnetic.

(a) If the characteristic impedance of the line is 15 Ω, find ˆˆ'_r. Assume a low-loss dielectric.

(b) Assume copper conductors and operation at 2 × 10⁸ rad/s. If RC = GL, determine the loss tangent of the dielectric.

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Dielectric (σ, ε μ) Conductor (o.)