Lecture -- Scattering from a Dielectric Slab

[@AJAdkins99]

I watch your videos for entertainment because the explanations are so good

[@pedroalonso7606]

Very illustrative video!

[@empossible1577]

Thank you!

[@egghead55425]

Excellent video! Z-phase hexaferrite from Transtech has a permittivity=permeability=10 whose characteristic impedance is matched to air (both are 377 Ohms), but the Brewster angle begins to narrow and I'm finding the bandwith of antennas are narrower vs. the same antenna in air/FR4. I'd love to see an analysis of this situation! Thank you for your most excellent videos!

[@empossible1577]

Great to know! My experience with these types of materials is that they are expensive, temperature sensitive, lossy, and highly dispersive (i.e. properties change abruptly with frequency). I don't know specifically about this one. In general, mu=eps materials are very interesting!

[@egghead55425]

@@empossible1577 Z-Phase Hexaferrites are not dispersive or lossy but they are very expensive! Reflection losses are minimized by matching the characteristic impedance to air, but the Brewster angle gets closer to 90 degrees. There are other materials which have much higher indices of refraction with permittivity=permeability at low loss which have recently published. We're able to shrink an antenna/lens by a factor of 10 to 20 while maintaining high efficiency and soon at low-cost!

[@moamenshahbazi]

Could you please teach how do you simulation field distribution in slab

[@empossible1577]

Absolutely! I can point you to several resources. I think the best method for slabs is the transfer matrix method (TMM). The primary drawback of TMM is that it will only ever simulate slabs. I offer free learning material for TMM here: empossible.net/academics/emp5337/ The above are the notes and videos I use for my face-to-face class so they do not include any codes or calculating internal fields. If you are struggling with the codes, there is the paid TMM Implementation course here: empossible.thinkific.com/courses/tmmmatlab If you think you want to simulate additional types of structures instead of just slabs, you may consider a method like finite-difference time-domain (FDTD) or finite-difference frequency-domain (FDFD). These can certainly simulate the slab problem, but also virtually anything else you may have in mind. For FDTD, here is an absolutely spectacular fully online course intended for the complete beginner: empossible.thinkific.com/collections/FDTD-in-MATLAB For FDFD, I recently wrote a book on this method. If you want to get into computational electromagnetics and you are not sure where to start, this is the perfect book. Here is a link the course website: empossible.net/fdfdbook/ Hope this helps!

[@moamenshahbazi]

Thank you so much for your answer, it is pleasure talking to you .can I have your email address?

[@empossible1577]

@@moamenshahbazi emprofessor(at)empossible.net

[@gunjankumari7792]

Kindly make a video on the EDC Effective Dielectric Constant method.

[@empossible1577]

I am not entire sure what you are referring to. I do have some notes on homogenization of metamaterials, also called parameter retrieval. The notes are newer than the video. See Lecture 5d in the "21st Century Electromagnetics" class: empossible.net/academics/21cem/

[@gunjankumari7792]

@@empossible1577 Thank you for your response. I will go through the referred notes. Actually, I was searching for videos on the EDC (Effective Dielectric Constant) method so I request you to make a video on this topic.