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Which statement is false about microstrip line over stripline?

Which statement is false about microstrip line over stripline? Correct Answer Less radiative

Explanation:

A microstrip line consists of a conductor built on a low-loss dielectric substrate with a grounded plane. It can be easily integrated into a microwave device.

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From the above, we observe that it consists of:

1) A conductor of width W

2) A dielectric substrate of thickness d and permittivity ϵ

On the other hand,

1. Stripline is often described as a coaxial cable that was run over by a truck, with its outer ground planes, the inner conductor and isolating dielectric material between the three metal layers.

2. Stripline conductors are well isolated by the surrounding dielectric material due to which they do not radiate and are described as being non-dispersive. 

Hence Microstripline is more radiative than stripline but it is easier for component integration due to stripline being totally covered structure.

So the correct answer is option (1).

Important Point:

  • The presence of the dielectric (commonly thin with d << λ) concentrates the field lines in the region between the conductor and the ground plane, with some fraction being in the air region above the conductor, leading to quasi-TEM modes of propagation in which dispersion occurs as a function of wavelength.
  • It is called a quasi TEM mode because some fraction of the wave escapes the desired region.
  • A Microstrip transmission line displaying a quasi-TEM mode of propagation is shown in the above figure. 

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