Gee, you're not posting any new information on the actual topic being discussed. Making your own charger is not answering the question, I'm not going to rip the charger out of my Sorento and replace it with a coil of wire there! Also, simply coupling a signal between two coils is not proving anything, the question is why can't we wirelessly charge through an aluminum case.
If it were one or even two of the chargers that was affected, I'd point the finger at the chargers. The fact that ALL the wireless chargers I happen to have ready access to, including the one that's built into the car, fail with a sheet of aluminum foil between the phone and the charger. BTW, I just found a couple more in a box that were of a different manufacturer, so now it's six for six that fail to charge through a single sheet of aluminum foil.
I don't pretend to understand in copious detail the in's and out's of how cellphone wireless charging is done or exactly why they won't work through any kind of metallic backing. I actually sort of see that your argument seems on the surface to make sense. However, the plain facts are, wireless charging as it's currently implimented in virtually all phones, if not really all phones, does not work through aluminum foil. I tried an iPhone 11, the Galaxy S20, and my older Galaxy S8+, exact same result with all of them, they don't notice the wireless charger at all. The chargers either alternate between sensing and a brief pulse of charging status or just sit there and visibly do nothing with their status LED, depending on the specific manufacturer of the charger.
It's also telling that Google had to cut a hole in their aluminum shell to allow the wireless charging to function. What I don't understand is why you think you're smarter than all the engineers that have worked on this problem and have not come up with a workable solution! I'm pretty sure someone has to have analyzed this issue to death, and probably somewhere there is a rational explanation of why this doesn't work. What I know for certain is, with the current generation of cellphones and chargers, it doesn't work!
If it were one or even two of the chargers that was affected, I'd point the finger at the chargers. The fact that ALL the wireless chargers I happen to have ready access to, including the one that's built into the car, fail with a sheet of aluminum foil between the phone and the charger. BTW, I just found a couple more in a box that were of a different manufacturer, so now it's six for six that fail to charge through a single sheet of aluminum foil.
I don't pretend to understand in copious detail the in's and out's of how cellphone wireless charging is done or exactly why they won't work through any kind of metallic backing. I actually sort of see that your argument seems on the surface to make sense. However, the plain facts are, wireless charging as it's currently implimented in virtually all phones, if not really all phones, does not work through aluminum foil. I tried an iPhone 11, the Galaxy S20, and my older Galaxy S8+, exact same result with all of them, they don't notice the wireless charger at all. The chargers either alternate between sensing and a brief pulse of charging status or just sit there and visibly do nothing with their status LED, depending on the specific manufacturer of the charger.
It's also telling that Google had to cut a hole in their aluminum shell to allow the wireless charging to function. What I don't understand is why you think you're smarter than all the engineers that have worked on this problem and have not come up with a workable solution! I'm pretty sure someone has to have analyzed this issue to death, and probably somewhere there is a rational explanation of why this doesn't work. What I know for certain is, with the current generation of cellphones and chargers, it doesn't work!