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In microstrip transmission lines used on printed circuit boards, can the RF/microwave signal path be redirected simply by changing (routing/turning) the centre strip geometry?

Difficulty: Easy

Correct Answer: True

Explanation:


Introduction / Context:
Microstrip lines are planar transmission lines consisting of a conducting strip over a dielectric substrate with a ground plane on the other side. They are ubiquitous in RF PCBs for routing signals.


Given Data / Assumptions:

  • Standard microstrip on dielectric (FR-4, Rogers, etc.).
  • Controlled impedance achieved via strip width, substrate height, and dielectric constant.


Concept / Approach:
Because microstrip is a planar structure, the signal follows the metal strip. Changing the strip's path (turns, bends, meanders) redirects the guided wave, provided impedance is controlled (corner mitering, bend radius) to minimize reflections and radiation.


Step-by-Step Solution:

Routing the centre strip defines current path and fringing fields.Bends and tees re-direct the guided wave if designed with proper impedance control.Thus, altering the strip geometry does redirect the signal path on the board.


Verification / Alternative check:
EM simulators and impedance calculators for microstrip confirm field confinement to the vicinity of the strip and ground reference, following the trace path.


Why Other Options Are Wrong:

'False' options ignore practical PCB RF designs where routing is exactly how signals are guided.


Common Pitfalls:

Ignoring added discontinuity effects at sharp bends; proper mitering or arcs are used to control impedance.


Final Answer:

True
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