what does this vectorel showing mean?

[h_cet]

Hello;

I am trying to study electromagnetic teory... but I have a little problem in connection with a vectorel showing...

For example, green function is following;

G(x,y, x', y') = -1/4 Ho(k√[(x-x')^2+(y-y')^2]

why do we use x, x' and y, y'? why dont we use just G(x,y)?

thank you for your help already

be well...

 

[Jone]

Well, you clearly have a function of four variables.

 

[halls]

The x,y pair of coordinates indicate the coordinates of the observed point, while the x',y' pair indicate the coordinates of the source of influence (let's say an antenna, for example).

 

[h_cet]

hi halls;

from your answer I understand that if we know the antenna' locaiton, x' and y' are an array of the coordinates of the antenna' location, arent they?

thank you for your help already

be well...

 

[jcy]

Also, the Hankel function argument

√[(x-x')^2+(y-y')^2]

gives the Cartesian distance between the source point (x',y') and the field point (x,y).

 

[halls]

Well, x' and y' (and z') are the scalar cartesian coordinates of a puntual source, not a whole antenna, but just a point.

If you wanted to calculate the influence of the whole antena, you should sum the influences of every point of the antenna, thus, you should integrate the green function across the x',y' and z' axes.

Hope this is clearer now.

 

[h_cet]

thank you very much halls for your helps...

be well..