piecat

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piecat ,

The last time I heard someone say that, they were taking about bidets, and it was life changing.

piecat ,

That can be for a few reasons...

In some cases you're tuning (or detuning) the antenna capacitively.

On other cases, like if your tv gets interference when you're standing in part the room, there may be standing waves causing interference, as the rf is bouncing around your room.

piecat ,

Depends. If the antennas were resonant dipoles placed some fraction of a wavelength away from each other (1/4 wave away), you may get some cancellation of the signal.

Look up the "yagi uda" antenna, it's the classic rooftop tv antenna. The elements are spaced by fractions of a wavelength to achieve directivity. One single element is driven, the others are just resonant lengths of wire.

piecat ,

Sorry, your comment doesn't make sense and doesn't seem correct to me.

Yes there is a capacitance, but capacitance isn't "voltage potential". Capacitance is a ratio of coulombs per volt. Anyway, that's beside the point.

There is capacitance and it's defined by geometry.

"The potential between you and the antenna affects the filter of the signal"

You're not adding potential to anything, nor are you affecting any filters.

Any capacitance you add will change the impedance of the resonant antenna. You get maximum power transfer when the impedance is matched.

Another way to look at it, you're changing the resonant frequency.

piecat ,

... Was this written by ai

I'm an rf engineer and I swear it feels like I'm having a stroke reading your comments

piecat ,

  1. as the distance increases the capacitance reduces. But C=Q/V doesn't mean you're not inducing any potential into the antenna... You're adding to the load... C=ε*A/d is the equation that says capacitance will decrease with distance, but that isn't going to induce any voltage in this case.

  2. yes this is what I'm saying.

  3. in the very near field, conductive tissue, ie a body, will have Eddy currents. Your body has an ε term as well as σ. You can definitely load an antenna. The R term will dominate but there will be some effect on inductance.

piecat ,

And yet most of us are making way less than we need

piecat ,

It… Kinda is?

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