Coef Reflexão
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Reflection Coefficient Calculator is an online tool that helps determine the reflection coefficient of a wave at an interface between two media with different impedances. The reflection coefficient is calculated using the formula R = ((Z₂−Z₁)/(Z₂+Z₁))², where Z₁ and Z₂ are the impedances of media 1 and 2, respectively.
This calculator is useful in various areas of physics and engineering, such as acoustics, optics, and microwave engineering. The reflection coefficient is important for understanding how waves behave when interacting with different materials and surfaces. For example, at an air-water interface, the reflection coefficient is high due to the large difference between the impedances of the two media.
When using this calculator, it is essential to be careful with the units of impedance, which must be consistent. Additionally, it is crucial to remember that the formula assumes that the waves are planar and that the interface is flat and infinite. In real-world situations, there may be additional effects that influence the reflection coefficient.
This calculator can be used in cases such as antenna design, analysis of wave reflection on rough or smooth surfaces, and in studies of wave propagation in heterogeneous media.
Frequently asked questions
What is the reflection coefficient?
The reflection coefficient is a measure of how much a wave is reflected when interacting with an interface between two media with different impedances.
What are the units of the reflection coefficient?
The reflection coefficient is dimensionless, meaning it has no units.
Can I use this calculator for electromagnetic waves?
Yes, this calculator can be used for electromagnetic waves, such as light or microwaves, as long as the impedances are correctly defined.
What if the impedances are complex?
If the impedances are complex, it is essential to use the complex form of the reflection coefficient formula. This calculator can handle complex impedances.
What are the limitations of this calculator?
This calculator assumes that the waves are planar and that the interface is flat and infinite. In real-world situations, there may be additional effects that influence the reflection coefficient.