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For a parallel plate transmission line, let v be the speed of propagation and Z be the characteristic impedance. Neglecting fringe effects, a reduction of the spacing between the plates by a factor of 2 results in (A) halving of v and no change in Z (B) no changes in v and halving of Z (C) no change in both v and Z (D) halving of both v and Z

1. (A)
2. (B)
3. (C)
4. (D)

Correct answer: (B)

Solution

Reducing the spacing between the plates of a parallel plate transmission line decreases the capacitance, which in turn lowers the characteristic impedance Z, while the speed of propagation v remains unchanged because it is determined by the dielectric properties of the medium between the plates.

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