....I was writing to say about the same thing in what you edited on the mode of TM212, good observation Jose ...
Quote from: apoc2021 on 06/28/2015 02:22 pmThanks so much for these movies !The effect of the antenna is beautifully displayed.highest field intensity is clearly at the SMALL BASE of the truncated cone.Action is NOT symmetric left to right (which many critics do NOT take into account).Wave to the SMALL BASE is travelling progressively and well formed towards the SMALL BASE.Recoil wave originating at small base to the BIG BASE occurs sharply and all of a sudden. Not progressive and occurs more like a shock.
Quote from: rfmwguy on 06/28/2015 01:45 am257.5 g for frustum exoskeleton, simply tacked together. Will need stiffening, should come in well under 750 g. Weight budget for everything at 1.5 kg looks fine. Circle cutting 11.01 and 6.25 was a hassle. Probably less stiffening needed with thicker copper clad pcb, oh well. Mr. Whiskers supervising...Edit...corrected gram weight...sheesh...sniffed too much solder smoke.This excites me to no end!!! Good for you and it looks like you do great work, clean edges and I like the way you supported the axis with the 4 standoffs. Smart man.cute kitty!Shell
257.5 g for frustum exoskeleton, simply tacked together. Will need stiffening, should come in well under 750 g. Weight budget for everything at 1.5 kg looks fine. Circle cutting 11.01 and 6.25 was a hassle. Probably less stiffening needed with thicker copper clad pcb, oh well. Mr. Whiskers supervising...Edit...corrected gram weight...sheesh...sniffed too much solder smoke.
Quote from: Rodal on 06/28/2015 02:40 pmQuote from: apoc2021 on 06/28/2015 02:22 pmThanks so much for these movies !The effect of the antenna is beautifully displayed.highest field intensity is clearly at the SMALL BASE of the truncated cone.Action is NOT symmetric left to right (which many critics do NOT take into account).Wave to the SMALL BASE is travelling progressively and well formed towards the SMALL BASE.Recoil wave originating at small base to the BIG BASE occurs sharply and all of a sudden. Not progressive and occurs more like a shock.Thanks apoc2021! I just finished getting one done and ready to post and boom, you're fast! Thanks again.This shock wave is a key I was looking for and I suspected it and now makes sense to see it happening.This is one full cycle, right?Shell
Quote from: apoc2021 on 06/28/2015 02:22 pmThanks so much for these movies !The effect of the antenna is beautifully displayed.highest field intensity is clearly at the SMALL BASE of the truncated cone.Action is NOT symmetric left to right (which many critics do NOT take into account).Wave to the SMALL BASE is travelling progressively and well formed towards the SMALL BASE.Recoil wave originating at small base to the BIG BASE occurs sharply and all of a sudden. Not progressive and occurs more like a shock.Asymmetries like this (left to right) are of paramount importance to explain momentum to one side (just like the difference between the ejecting jet of air and the vacuuming intake of air in acoustic propulsion of bottles).
A delta function excitation at the antenna might be instructive, since then the time evolution would be only due to cavity modes and not to a mixture of antenna and cavity. However, I fear that a delta function will not propagate successfully down a waveguide. Perhaps the best one could do in this regard, then, would be to excite the antenna with a single cycle and record the cavity fields one cycle later.
...Althouth it looks like the field strength is stronger at the small end, we have no data. What about averaging the field values for each frame we see in this video and produce the resulting "averaged" field strength ?
I was thinking of a few modifications. One idea was to fill the cavity with barium titanate which I think slows down the propagation speed and allows us to move into the radio frequency range. ...
...- Barium titanate at MHz has an extraordinarily high relative pemittivity. This translates (via sqrt) into a high refractive index....
Quote from: deuteragenie on 06/28/2015 03:47 pm...Althouth it looks like the field strength is stronger at the small end, we have no data. What about averaging the field values for each frame we see in this video and produce the resulting "averaged" field strength ?We need NUMBERS to quantify this, there is no other way around it. Without numbers one cannot compare.At least now we have everything scaled to the same Max Min numbers, unfortunately we don't know the numbers.Can you tell aero how to output NUMBERS in Meep?
Quote from: Rodal on 06/28/2015 03:51 pmQuote from: deuteragenie on 06/28/2015 03:47 pm...Althouth it looks like the field strength is stronger at the small end, we have no data. What about averaging the field values for each frame we see in this video and produce the resulting "averaged" field strength ?We need NUMBERS to quantify this, there is no other way around it. Without numbers one cannot compare.At least now we have everything scaled to the same Max Min numbers, unfortunately we don't know the numbers.Can you tell aero how to output NUMBERS in Meep?Outputting numbers is usually just write to a CSV file. The problem is to include some corresponding time stamp so we can associate which numbers go to which frame and which color. I.e., the CSV file will need an interpreter.Todd