Recent content by baby_1

Hi, Below are the expressions for the electric (E) and magnetic (H) fields in a good conductor. Using those, the Poynting vector can be determined as follows. By applying the appropriate conversions and starting from these equations, we obtain: However, the result differs from the one in...

I realized my mistake: in the main equation, the sign of the propagation constant should be negative. Thank you once again for your help!

Dear TSny, Thank you for your help. In many electromagnetics resources, I have noticed that the propagation constant is often represented with a "j," but I am having trouble understanding why this is the case. I have attached one of the references for your review.

Here is my question: $$ \nabla^2 \bar{E} + \omega^2 \mu \left( 1 - j \frac{\sigma}{\omega} \right) \bar{E} = 0 $$ where $$ \gamma = \alpha + j \beta $$ $$ \gamma^2 = \omega^2 \mu \left( 1 - j \frac{\sigma}{\omega} \right) $$ $$ \gamma = j \sqrt{ \omega^2 \mu \left( 1 - j...

Thank you very much for your response. Yes, the optimization is performed numerically. So it means I should use the numerical form of the above equation instead of the analytical form.

I appreciate your help. Yes, I don't understand how they obtain ##\rho (\phi)## for different values of ##\phi## -because this equation should be solved for many values of ##\phi##. No, the FDIWO is the acronym of frequency-dependent IWO- an optimization algorithm to find the C0 to Cn values-.

Hello, Please see this part of the article. I need to obtain the ##\rho (\phi)## value after obtaining the c0 to c5 constants of the ##\sigma (\phi)##. But as you can see after finding the coefficients, solving Eq.(1) could be a demanding job(I wasn't able to calculate the integral of Eq(1)...

Thank you Malawi_glenn, Yes, it seems the administrators changed the group of my question. My question is part of an article instead of a textbook.

As you can see in this picture: This explanation "relation between the normal and the slope of a curve" is formulated here: $$\frac{1}{\rho} \frac{d\rho }{d\psi }=\tan\left(\frac{\theta+\psi}{2}\right)$$ I got confused because I don't have the curve equation(regarding the slope of the curve...

Thanks berkeman, Regarding this web page, I am curious to know why the electric currents should be zero. In addition, which parameter in PMC is infinite( for example for perfect electric conductor(PEC) the conductivity (sigma) is infinite).

Hello, I need to know why having an electric current in Prefect Magnetic Conductor(PMC) violate current conservation. Based on the boundary conditions or lorentz force or ..., I couldn't be successful to prove that surface current can violate current conservation. In the textbooks, they...

I highly recommend to read this book.

Dear daiisibil, First, It is not the image theorem when the surface is not limited. It is just a simple question: if we have a conductor near a positive charge, based on the free electron which exist on the conductor they are affected by the charge electric field and they sit on the conductor...

Based on the Gaussian law qin is the charge which is enclosed by the surface not out of the Gaussian surface. Total charge which is the sum of +q and induced charge is equal to each other and cancel each other( when the sphere is grounded). If sphere is not grounded the the Total charge out of...

Dear Delta2, if cylindrical dielectric wave-guide without the PEC body is assumed the user should calculate the above equation which has been obtained by separation of variables for outside and inside of wave-guide and then connect them via boundary conditions. But I thought that the user is...