[Antennas] Q
Mike J Maloney
[email protected]
2002年10月12日 22:12:34 -0500
In electrical terms Q can be considered a measure of how well a device or
circuit stores energy compared to how much it looses due to losses or
radiation. A mechanical analogy would be a pendulum. A "high Q"
pendulum would be one that would keep on swinging long after the force
that set it into oscillation was removed. An LC (coil/capacitor) "tank"
circuit or an equivalent frequency resonant antenna likewise can store
energy once the electric force that began the oscillations is removed.
With high Q circuits the losses to resistance (heat) or space (radiation)
are relatively small. The high rf voltage levels at the ends of a
dipole antenna (higher than the 2X fwd wave predicted by transmission
line analysis), can be attributed to the "Q" of the antenna.
You will probably have to go to some very old physical science or physics
books to really find a good definition. I'll see what my 1930's "Radio
Physics Course" text book says on the subject, if your wanting to get any
deeper into it?
73, Mike, ac5p
On 2002年10月12日 11:58:12 -0400 WD8 O KN <[email protected]> writes:
> Where do I find a good definition and explanation of "Q"?
>> WD8OKN
> Michigan
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