Enter the relative permittivity of the dielectric material, height of the dielectric material, and width of the stripline trace into the calculator to determine the impedance, and this calculator can also evaluate any of the variables given the others are known.
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To calculate the impedance of a stripline, divide 60 by the square root of the relative permittivity of the dielectric material. Then, take the natural logarithm of the expression (4h/w) plus the square root of 1 plus (4h/w) squared.
What is a Stripline Impedance?
Stripline impedance is a critical parameter in the design of high-frequency electronic circuits, particularly in the field of radio frequency (RF) and microwave engineering. It refers to the characteristic impedance of a stripline, which is a type of transmission line used to convey RF signals. The stripline is a flat conductor sandwiched between two ground planes. The impedance of a stripline is determined by the width of the conductor, the thickness and dielectric constant of the insulating material between the conductor and the ground planes, and the distance between the ground planes. The characteristic impedance is important because it determines how signals will propagate along the line. If the impedance is not properly matched at all points along the line, reflections can occur, leading to signal distortion or loss. Therefore, accurate calculation and control of stripline impedance is essential for the successful design of high-frequency circuits.
How to Calculate Stripline Impedance?
The following steps outline how to calculate the Stripline Impedance.
- First, determine the width of the stripline (W) in millimeters.
- Next, determine the height of the dielectric material (H) in millimeters.
- Next, determine the relative permittivity of the dielectric material (εr).
- Finally, use the following formula to calculate the Stripline Impedance: Z = 87 / √(εr) * ln(5.98 * H / W + 1.74 * W / H).
- After inserting the values of W, H, and εr into the formula, calculate the Stripline Impedance.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Width of the stripline (W) = 10 mm
Height of the dielectric material (H) = 5 mm
Relative permittivity of the dielectric material (εr) = 4.5
