PCB Design - Advanced Routing Techniques
If the dielectric thickness (H) is doubled while keeping other parameters constant, how does the impedance of a microstrip trace generally change?
If the dielectric thickness (H) is doubled while keeping other parameters constant, how does the impedance of a microstrip trace generally change?
medium📝 Formula Result Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand relationship between H and impedance
Impedance is roughly proportional to the dielectric height H; increasing H increases impedance.Step 2: Analyze effect of doubling H
Doubling H increases the numerator inside the ln term, increasing overall impedance.Final Answer:
Impedance increases -> Option AQuick Check:
Higher dielectric thickness = Higher impedance [OK]
Quick Trick: More dielectric height means higher impedance [OK]
Common Mistakes:
MISTAKES- Assuming impedance decreases with H
- Thinking impedance is independent of H
- Confusing dielectric thickness with trace width
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