[Antennas] Re: Hairpin monopoles

Wed, 7 May 2003 07:58:50 -0700 (PDT)

Thanks Roy for sparing me the task of making the same
argument.
--- Roy Koeppe <[email protected]> wrote:
> Oh, oh, regarding,
>> "It's not a matter of what I think - it's a simple
> fact. The resistive
> component of the antenna's input impedance (the
> radiation resistance) is
> generally higher than a conventional, non-folded
> radiator."
>>> This old hams' tale has persisted throughout the
> years and now rears its
> head again? Radiation resistance and input impedance
> are two entirely
> separate things. With a folded element the input
> impedance is simply
> stepped up by transformer action alone, just as if
> you installed a
> transformer at the feedpoint. Radiation resistance,
> on the other hand,
> remains constant. Actually, most folded monopoles
> have a slightly LOWER
> radiation resistance than their single conductor
> counterparts. This
> obeys the law about "the thinner the conductor, the
> higher the radiation
> resistance, for the same self-resonant element." Fat
> elements are
> physically shorter than thinner ones for the same
> resonant frequency,
> hence have a lower radiation resistance.
>> 73, Roy K6XK/0
>>>>> - - - 
>> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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