Edge Coupled Stripline Impedance Calculator

Edge Coupled Stripline Impedance Formula:

\[ Z = \frac{60}{\sqrt{\varepsilon_{\text{eff}}}} \times \ln\left(\frac{8h}{\pi w}\right) \]

Edge-Coupled Stripline Impedance (Z):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Edge-Coupled Stripline Impedance?

Edge-coupled stripline impedance refers to the characteristic impedance of parallel transmission lines in a stripline configuration where the conductors are placed edge-to-edge. This configuration is commonly used in high-frequency circuits and microwave applications for creating directional couplers and filters.

2. How Does the Calculator Work?

The calculator uses the edge-coupled stripline impedance formula:

\[ Z = \frac{60}{\sqrt{\varepsilon_{\text{eff}}}} \times \ln\left(\frac{8h}{\pi w}\right) \]

Where:

\( Z \) — Characteristic impedance (Ω)
\( \varepsilon_{\text{eff}} \) — Effective dielectric constant (dimensionless)
\( h \) — Height between ground planes (mm)
\( w \) — Conductor width (mm)

Explanation: This formula provides an approximate calculation of the characteristic impedance for edge-coupled stripline configurations, accounting for the dielectric properties and physical dimensions of the structure.

3. Importance of Impedance Calculation

Details: Accurate impedance calculation is crucial for designing high-frequency circuits, ensuring proper signal integrity, minimizing reflections, and achieving optimal power transfer in microwave and RF applications.

4. Using the Calculator

Tips: Enter the effective dielectric constant (dimensionless), height between ground planes in mm, and conductor width in mm. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for edge-coupled stripline impedance?
A: Typical values range from 50Ω to 100Ω, though specific applications may require different impedance values.

Q2: How accurate is this approximation formula?
A: This formula provides a good approximation for preliminary designs, but for precise calculations, more complex models or simulation tools should be used.

Q3: What factors affect the effective dielectric constant?
A: The effective dielectric constant depends on the substrate material properties, frequency of operation, and the geometry of the transmission line structure.

Q4: When should I use edge-coupled stripline vs other configurations?
A: Edge-coupled stripline is preferred in applications requiring tight coupling, good isolation, and symmetrical performance in balanced circuits.

Q5: Are there limitations to this equation?
A: This equation assumes ideal conditions and may not account for edge effects, conductor thickness, or frequency-dependent dispersion effects.