The Microstrip Mitred Bend Calculator determines the optimal miter dimensions for a 90° microstrip bend to minimize reflection and maintain characteristic impedance continuity. Proper mitering ensures smooth signal transition and reduces impedance mismatch in high-frequency PCB layouts.
Formulas
D = W * √2
X = W * √2 * (0.52 + 0.65 * e−1.35 * (W / h))
A = X * √2 − W
Where:
- W = Width of the microstrip line
- h = Height (thickness) of the substrate
- D = Diagonal length of the mitered square corner
- X = Effective diagonal compensation distance
- A = Adjusted (compensated) length to maintain impedance at the bend
Applications
- Used in PCB design to minimize reflection at right-angle bends.
- Ensures consistent characteristic impedance across microstrip transitions.
- Improves signal integrity in RF and microwave circuit layouts.
- Commonly used in microwave filters, couplers, and antenna feed networks.
Example Calculation
Input: W = 1112 mil, h = 22 mil
Results:
- D = 1112 × √2 = 1572.61 mil
- X = 1112 × √2 × (0.52 + 0.65 × e−1.35 × (1112 / 22)) ≈ 817.75 mil
- A = 817.75 × √2 − 1112 ≈ 44.48 mil