## About SIW Calculator (Formula)

The SIW Calculator is designed to calculate the effective cross-sectional area (aeff) for Signal Integrity Waveguides (SIW) based on the provided parameters. The formula for calculating aeff is as follows:

**aeff=a−(d2/0.95∗s)**

Where:

- $a_{eff}$ is the effective cross-sectional area.
- $a$ is the distance between two via rows.
- $d$ is the diameter of the vias.
- $s$ is the distance between two successive vias in the same row.

This formula is used in the context of SIW design to calculate the effective cross-sectional area of the waveguide, which is an important parameter for understanding and analyzing the electrical properties of the waveguide. A larger effective cross-sectional area can lead to lower signal losses and better signal integrity in the SIW structure. The calculator takes these parameters as input and computes the effective cross-sectional area based on the provided values.