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I am aware that this is a PFC, although the output except for the isolation issue will work for my application as is. I should have used PFC instead of SMPS in the title line. There's more to this reply in the following reply to the other poster.
1702950447
I get that. I know that neutral in...
Hi,
I am interested in using a switch mode controller for a project I am working on. I am having some trouble understanding the generic diagram presented in the datasheet for a particular controller. Here is a schematic for reference.
My issue is with what is apparently line input to a common...
dB = 6, Z1 = 50, Z2 = 53.5
Attached is my attempt to convert the asymmetrical pi pad equations into a set of asymmetrical t pad equations following the pattern in the symmetrical set of equations, which is basically that everything following the impedance term is turned into a reciprocal to...
Hi,
I need the equations for a T pad with different source and load impedances. I noticed that with the same source and load impedances, the equations for the Pi pad and T pad are mostly just reciprocals of each other. I tried to follow the same pattern the the Pi pad equations for different...
Is there a clear concise treatment of how to derive values for L-Match components given the complex source and load impedances?
I see there are lots of calculators around, although I would like to see and follow the derivations of the solutions for all eight L-Match permutations.
I had read Q3D needs lambda/10 or smaller because it uses quasi-static analysis, so I was using 0.095*lambda. In any case, Q3D also does 2D extraction. So I built a 2D model and that gives me all I need in one go even faster than the 3D model. It always helps to use the proper tool for the job...
I used symmetry planes with other simulators. As I understand it, they're used to speed up the sim by eliminating redundant areas of the model. In Q3D these models only take about one minute or so to run in full 3D.
The problem, rather than time of run, is that I have to run two simulations...
Update:
I am now obtaining results that agree significantly closer to actual test measurements than to the standard formula for parallel wire transmission lines. That's satisfying, although I have run two simulations to do it, one with the wires open to get the capacitance, and one with the...
I am modeling a two wire transmission line in Q3D. I want to determine the impedance of the line with arbitrary sized conductors and distance between them. I've gotten results that I am having trouble reconciling with the standard equation for two wire transmission lines L.
In the model results...
On page 98 of "Antenna Theory" 2nd Ed. Balanis says the sky temperature varies from 5 K looking up to 100-150 k at the horizon, although he omits mention of a frequency with that and inclusion of a graph that would show what kind of curve the gradient takes.
I think this paper will do for now...
I'm designing a quadrifilar helical antenna for amateur satellite communications on the 70cm band. This antenna is stationary with an omnidirectional circular polarized pattern. The satellites it communicates with are in low earth orbit around 1000 km high.
I want to use the antenna noise...
Hi,
I have a antenna project for which I want to determine a noise temperature figure. In the reference material I have, a figure of 290 K to 300 K is given for ground noise temperature and 4 K for sky background temperature. I am interested in the gradient from a zenith angle of 75 degs to...
I managed to work this out in FEKO the long way, and after studying the results I realized I misinterpreted you response. FEKO's results show that the frequency of the peak power dissipated in the source of the transmit antenna is very close to the frequency of peak power dissipated in load of...
Well, I guess I'll answer my own question.
FEKO will simulate antenna to antenna coupling. Set up one antenna with a source and then set up another with a load. Finally measure the power dissipated in the load.
Undoubtedly CST and HFSS can do this as well, although FEKO was on one so far...
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