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slffea
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Joined: 19 Oct 2009
Posts: 3
Location: California

 Posted: Mon Oct 19, 2009 11:33 pm    Post subject: maths on page http://www.antenna-theory.com/tutorial/wavegui I'm going over the math on the page: http://www.antenna-theory.com/tutorial/waveguides/waveguides2.php and I think there are some mistakes when you discuss the zeroing out of constants based on the boundary conditions. Specifically, when you talk about the constant c3, you accidentally refer to it as c4. Look at the discussion below where you talk about the boundary condition: Ex(x, y=b, z)=0 [10] Similarly, I think there is a mistake when talking about c2 and c1 and the boundary conditions: Ey(x=0, y, z)=0 Ey(x=a, y, z)=0 For Ey = 1/eta(dFz/dx) at x=0.0, the c1*cos(kx*x) becomes c1*sin(kx*x) which is 0 at x = 0. So it is the c2 term that should be 0. Thanks.

Joined: 03 Jan 2007
Posts: 203

 Posted: Tue Oct 20, 2009 5:47 am    Post subject: Wow, those were both good catches. I updated the page so that it now refers to the correct constants. Thank you very much.
slffea
Antenna-Theory.com Newbie

Joined: 19 Oct 2009
Posts: 3
Location: California

 Posted: Tue Oct 20, 2009 9:29 pm    Post subject: I think there are a few more problems. On the next page: http://www.antenna-theory.com/tutorial/waveguides/waveguides3.php for Ex in equation [1] you have: Ex = ...cos()*cos().. but it should be: Ex = ...cos()*sin().. Thanks.

Joined: 03 Jan 2007
Posts: 203

 Posted: Thu Oct 22, 2009 4:05 am    Post subject: Thanks again. I fixed the mistake.
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