Continue to Site

# understanding the meaing of k number direction in plane wave

Status
Not open for further replies.

#### yefj

##### Advanced Member level 3
Hello,I am confused regarding direction in plane wave
there is X direction of the field but also i have direction of the values in "exponent."
how do i know what direction does it propogate?
how does these two directions go togother?
thanks.

If this is indeed the form of a plane wave, the direction of propagation would be theta_in, which is in the y-z plane. You can check this by taking the gradient of the field -- which for a plane wave -- gives you the direction of propagation.

You need to follow in what direction the phase changes. Because propagation of a planewave in a lossless media(like your case) is nothing but a phase change. Here, either of y or z changes the phase. Therefore we can say that it propagates into some direction in between y and z.

The K variable value must likely be either +1 or -1, determining CW or CCW rotation.

The K variable value must likely be either +1 or -1, determining CW or CCW rotation.
The k term in this context is usually wavenumber (at least where I come from), but I suppose the OP did not specify.

Status
Not open for further replies.