Keith Dysart wrote:
On Jul 1, 4:35 pm, Cecil Moore wrote:
Richard Harrison wrote:
Radiation resistance is a resistance. Radiated energy has its current
in-phase with its voltage.
The IEEE Dictionary is pretty clear when they define two
types of resistances: (A) a resistor with resistance and
(B) a virtual resistance with the V/I ratio in phase.

I could not find "virtual resistance" in "IEEE 100, The Authoritative
Dictionary of IEEE Standards Terms, Seventh
Edition".

Do you have a reference?
Note: Definitions (A) and (B) are not equivalent but are
supplementary. In any case where confusion may arise,
specify definition being used. See also: resistor."

Sure do, Keith - your own quote. An example of Definition
(A) is a resistor. An example of Definition (B) is the
characteristic impedance of a transmission line which
is a virtual dissipationless resistance. Another example
of (B) is the feedpoint impedance of a standing wave
antenna. Another example of (B) is the virtual impedance
at the end of a quarter-wave series section transformer.
Another probable example of (B) is the dissipationless
part of a generator's source impedance.
--
73, Cecil http://www.w5dxp.com