RadioBanter - View Single Post - How was antenna formula for uV/Meter Derived?

July 31st 03, 12:05 AM

(Tom Bruhns) wrote in message m...

I'd think the best examples come from dynamic systems, because the EM
wave is dynamic. In fact, you can define mechanical impedances, too.
You can have a long row of masses connected by springs, for example,
and spring force may be analogous to current, and mass displacement to
voltage.

Consider a mass on the end of a spring compared to an L-C tank
circuit.

The mechanical equivalent of inductive impedance would be simply
the mass. That is, the resistance to the change of current compared
to the inertia of a massive body.

The spring force would be analogous to the voltage charge in a
capacitor, not the current.

The velocity of the mass is analogous to the current in the tank
circuit.

The displacement of the mass is analogous to the total stored
charge in the capacitor. I.E., max displacement corresponds to max
charge storage in the cap, with the corresponding max voltage and max
force from the spring (fully stretched or compressed).

Slick