Recent content by baby_1

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...

Hello, You didn't mention about the material of your cylindrical wave guide. If it is PEC, you need to calculate the wave inside of the wave guide by boundary condition where E_t=H_t=0. For solving your problem, follow these rules Write the \nabla^2 \vec{E}_{z}=(j\omega \mu \sigma-\omega...

Hello, 1) The Gaussian surface around the charge is a Sphere too. So we can write: D_{r}4\pi r^2=q_{in}=>D_{r}=\frac{q_{in}}{\pi r^2}=>E_{r}=\frac{q_{in}}{\varepsilon \pi r^2} It is valid between the Sphere and charge. Outside of sphere we have no charge regarding the sphere is grounded. 2) For...

Hello, Something has made me confused after studying the Snell equations these days. Regarding the Balanis Advanced engineering electromagnetic( the pages have been attached), and based on that the reflection and transmission coefficient can be complex I need to rewrite the (5-23a) again...

I see the Like is nothing to thank you. I really appreciate your explanations and the time you spent to draw the shape and explain more and more.