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Stripline: Its advantages and disadvantages

Stripline consists of a flat strip of conducting material separated from two ground planes by a dielectric material as shown in figure below:

      
Fig: Stripline

Properties of Stripline:
  • used over the frequency range from 100MHz to 30GHz.
  • the central conductor needn't be equally spaced between the ground planes.
  • the dielectric material may be different above and below the central conductor.
  • when the separation of ground planes is less than ƛ/2 , the field can't propagate in the transverse direction and decrease exponentially.
  • the energy is confined inside the line cross-section provided the width of the ground plane is at least five times greater than the spacing between the plates.

Advantages of stripline:
  • smaller than waveguide or co-axial line
  • has a greater frequency bandwidth
  • has a lower radiation loss
  • better isolation
  • good EM shielding can be achieved

Disadvantages of stripline:
  • complex and expensive in fabricating it
  • tuning or troubleshooting is complex
  • stripline trace width is smaller compare to microstrip line of same impedance and height.

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