Re: NEC-LIST: resonance and Q of an antenna and scattering system

Q=2/HPBW is unloaded Q. Loaded Q is 1/HPBW. HPBW=Half-power bandwidth.
As can be seen, this is treating an antenna as a circuit element, and the Q
is only with respect to its terminal impedance. The HPBW is also a circuit
definition. Other kinds of BW are often defined, which are not directly
related to Q, such as pattern bandwidth. Amateur transmitters often can't
stand VSWR>2, so they use BW as the VSWR<2 bandwidth. This is probably
related to the HPBW, but probably not simply. I have no idea if people in
the scattering community use the Q concept.

Doug Miron

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