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Electrical Engineering

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32 questions
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1 vote
2 answers
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Have you tried simulating the behaviour of a commercial IoT antenna with Lithium Ion batteries in proximity using QUCS studio? I looked for tutorials but was not able to find anything useful. Can ...
DRF's user avatar
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1 answer
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From my very limited knowledge of EM, I believed that anything tied to earth can absorb radio waves, so if an antenna was to be placed above a ground plane, why does the ground plane not just absorb ...
George kirby's user avatar
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1 answer
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Many designs of metal detector coils use different gauges of wire for the TX and RX coils - why is that? Does the wire thickness influence other parameters rather then just the resistance and current ...
ron vais's user avatar
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0 answers
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Although not directly an electronics question, there is probably someone who can help me out. I just started to use Sonnet lite to simulate a microstrip filter. There is one aspect, which to me seems ...
Waldorf's user avatar
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I'm currently solving some university E&M homework problems and to solve input impedance, we were given this formula (from Fundamentals of Applied Electromagnetics 6th Ed): But when I browse ...
jacob arnold cena's user avatar
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2 answers
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Let's consider the case of linear dipole antenna or Hertz dipole. I know that the antenna acts as a transducer and it radiates the E-M waves due to the acceleration and decelaration of the electrons ...
Moulee's user avatar
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1 answer
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I am trying to understand how basic electromagnetic communication works. From what I understand, spark-gap transmitters were the first wireless devices made by man. A couple of circuits I found online ...
Mat's user avatar
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1 answer
52 views

So in a region of free space with zero charge, all I'm given is that the electrostatic potential V is given by: $$V(x,y,z) = kz(x^2) y + 2y - 6y(z^3)$$ [Volts] To find the constant k, would I have to ...
swattsen's user avatar
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I'm currently working on a design who involve a NFC chip (ST24DV) who need to be on the board as it's used to communicate with a smartphone. Here is the picture of the antenna: There is a LED on the ...
Prof_Sims's user avatar
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According to the Fresnel equations, the effective reflectivity of an arbitrarily polarized electromagnetic wave is given as: $$ \Gamma = \frac{\Gamma_p + \Gamma_s}{2} , $$ where \$\Gamma_p\$ and \$\...
divB's user avatar
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84 views

I have read about unintentional radiators, but wonder about what their unwanted emissions detection range can be in low background noise, referring to battery powered motion-sensor activated video ...
yifos's user avatar
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1 vote
1 answer
176 views

I have a 4-layer project in AWR/MWOffice and have built a parameterized microstrip inductor schematic (named "spiral") with a "Line Type" of layer1 that I wish to reuse on another ...
KJ7LNW's user avatar
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1 vote
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I have a 902 MHz to 928 MHz UHF 8dBi far-field RFID antenna connected to a reader. I want to read RFID tags. What will be the consequences if I used this UHF antenna in the near field range when it is ...
JoeyB's user avatar
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2 answers
328 views

I cannot find a simple (or really, not-so-simple) explanation of how mixing the high-frequency carrier wave with the lower-frequency input signal works... Is it entirely due to constructive and ...
Kurt Hikes's user avatar
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4 answers
309 views

If you using a simulation tool that allows you to simulate behaviour electromagnetic waves in an environment. What differences are there in terms of doing the simulation in 2D vs 3D? Does doing the ...
JoeyB's user avatar
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