Hey guys, thanks for coming back to Wi Fi fundamentals location and analytics. This course will help you to muster the air. At the end of RF wave Part One will describe the RF energy as it spreads in the air in the form of a sine wave. We have also mentioned its properties, period, frequency, wavelength, amplitude, and phase. But before we dive in into each, I want to give you another view of a sine wave that I believe will make it clear and simple to understand. We've mentioned the signs are related to circle.

Alright, so how do you measure the distance around the circle? Well, it seems that if you draw a line from the circles outer edge through its center To the opposite outer edge, which is the diameter and multiply it times pi, which is a constant equal to three point 14, you will get the distance around the circle which is also called the circumference. It doesn't matter if your circle is huge or small. You can also measure the distance around the circle using degrees. A full circle everyone knows is 360 degrees. If we cut the circle to have, we've actually stepped 180 degrees from the zero degrees origin.

If we continue to cut the circle into four pieces, half of 180s 90 degrees, and so we have the circle splitted into degrees, from zero to 90 and then to 180 270 360 Now let's tear down the circle to two pieces and rotate the button half. What do we get? Do you see that says sine wave, it's the same circle circumference just differently. If we start to measure it, we start with that zero degrees, move along to 90 degrees up to 360 degrees. You will very soon learn that a Wi Fi signal that starts from the origin in different degree, which we also call a phase is the basis for higher data rate. Okay, now let's understand our waves property.