📝 Guided media: Coaxial Cable

Q1. If the inner conductor diameter of a coaxial cable is increased while the outer diameter remains the same, what happens to the characteristic impedance?

💡 Difficulty: easy | ✅ Correct: B

Q2. A coaxial cable with dielectric constant ε_r = 2.25 has inner diameter 2 mm and outer diameter 6 mm. If another cable uses the same outer diameter but inner diameter 1 mm, how do their characteristic impedances compare?

💡 Difficulty: medium | ✅ Correct: A

Q3. Given Z0 = 75 Ω, ε_r = 2.25, and outer diameter D = 6 mm, determine the required inner conductor diameter d using the characteristic impedance formula.

💡 Difficulty: hard | ✅ Correct: A