Recent content by fred3142

I can confirm that the lecturers answer for the width is simple wrong and what I've done is correct. As for the width the inset gap has to be, I still don't know. I think it is meant to have something to do with the phase of the wave (perhaps it should be made, say, half or quarter wavelength).

I'm trying to work out what 3.d) is meant to be. I'm not entirely sure which part of the antenna it is referring to; I assume it's referring to width of the gap between the feed and the patch. If this is the case, I have no idea what width one would want to make it. I would've thought as small...

Hi, I'm an electrical engineering student starting research in nonlinear optics, and I'd like some good books to do with nonlinear optics. I'm looking for book similar in style to Nonlinear Optics by Robert Boyd as I really quite like that book. Other books I've gone through include Optical...

Hi, I'm rather confused as to how this diagram in my book. I know that in order for a mode to propagate, a standing wave must be formed in the waveguide, and this happens above some cutoff frequency that one designs for. What I don't understand is, below cutoff, what happens? I don't...

Ah okay, sorry I did not realize. Thank you nonetheless!

Thanks for the clarification. I'm not sure I entirely understand, from what I understand, you're saying that in order to excite the TE10 mode, one must place the antenna in a particular location in the guide; does this mean that then only the TE10 mode will be excited (because in order to...

Hi, I know that to receive or inject a signal into a rectangular waveguide (I'll just call it a waveguide from now on with the assumption that I mean rectangular waveguide), you can get a dipole of some sort, and poke it into the waveguide. What I'm wondering about is, if I got a dipole...

It's a parallel plate transmission line. Is that different to a parallel plate waveguide?

Hi, I think I'm missing something with how a parallel plate waveguide works. In the picture I've shown below, there intensity of the E-field change depending on how far across the waveguide it is. While I know that this has to happen in order for anything to propagate, I don't quite...

Thank you. Are you aware of any books which go into this? The article seems quite good too!

Hi, I'd love a to have a more graphical understanding of how a plane wave interacts with a boundary. I know the maths that describes it, Fresnel's equations etc, and how Brewster's angle is derived and stuff. I'm rather confused with the dipole concept. From what I understand, when a plane...

Hi, I am trying to gain a better understanding of the classical model of electrodynamics, so what I mean by this is, using the idea of dipoles and electron movement to understand electrodynamics. More specifically, I'm studying plane waves, and I can't understand why when a plane wave hits a...

Thank you for the reply. I understand the derivation of these equations (at least I think I do), and I understand that they are based upon the boundary conditions (tangential fields equal on either side of the boundary and perpendicular components not necessarily equal, and a charge...

Hi, I'm struggling to conceptually understand why Brewster's angle occurs. I know Fresnel's equations and can see that at some angle, the reflected parallel component goes to zero. What I don't understand is why this is conceptually happening. I understand that the material is made up of...

Okay, so basically it's a quarter wave because in a quarter wave, the impedance goes from a minimum (at, say, the beginning of the line) to a maximum (at, say, the end of the line) and so basically the sine wave (representing the impedance) can then be scaled to meet the requirements of input...