Re: NEC-LIST: Small antennas: can they me multiply resonant?

In this discussion of "small antennas" I think it would be instructive if we
identify what dimension is under consideration. For example is it the
Max(x,y,z) in the Cartesian system, R in the spherical system or the length
of a line as in a meander line or the total periphery of a loop (simple or
fractal)?

Malcolm M Bibby

----- Original Message -----
From: "D. B. Miron" <dbmiron_at_paulbunyan.net>
To: <alan.boswell_at_baesystems.com>
Cc: "NEC-LIST" <nec-list_at_gweep.ca>
Sent: Tuesday, January 07, 2003 10:01 AM
Subject: Re: NEC-LIST: Small antennas: can they me multiply resonant?

> Good day Alan,
>
>
>
> Here are a couple of papers I've written. Volume loading is a way of
> getting so much structural capacitance that series resonance can be
induced
> even for very tiny antennas. Of course, high Q becomes an issue if you go
> small enough. The CTHA is essentially a radiating transmission-line
> structure which is electrically-small at the first three standing-wave
> resonances.
>
> "Volume Loading-A New Principle for Small Antennas", ACES Journal, July
'99.
>
> "A Study of the CTHA Based on Analytical Models", IEEE Trans. on Antennas
> and Propagation, August, 2001.
>
> Also, there are fractal loops that have resonances below 0.3 wavelength.
I
> can't find the last article I saw on the subject, you might contact Chip
at
> fractenna_at_aol.com.
>
> ----- Original Message -----
> From: <alan.boswell_at_baesystems.com>
> To: <dbmiron_at_paulbunyan.net>; <nec-list_at_gweep.ca>
> Sent: Tuesday, January 07, 2003 4:53 AM
> Subject: RE: NEC-LIST: Small antennas: can they me multiply resonant?
>
>
> Doug
>
> I am interested in who has found such structures and where the results
were
> published. An electric element has a small radiation resistance in series
> with a capacitive reactance, an magnetic element is the same except the
> reactance is inductive. What other sorts are there?
>
> All the best,
>
> Alan
>
>
>
> -----Original Message-----
> From: D. B. Miron [mailto:dbmiron_at_paulbunyan.net]
> Sent: 06 January 2003 19:16
> To: NEC-LIST
> Subject: Re: NEC-LIST: Small antennas: can they me multiply resonant?
>
>
> David, Steve, and Alan,
>
> I think most of us working on small antennas define "small" in terms of
> wavelength of operation, rather than being subresonant. Some of us have
> found structures that don't include lumped elements that have one or more
> resonances at wavelengths where the antenna is still small. So, I agree
> with Steve's posting.
>
> Doug Miron
>
> ----- Original Message -----
> From: <alan.boswell_at_baesystems.com>
> To: <d.jefferies_at_surrey.ac.uk>; <nec-list_at_gweep.ca>
> Sent: Monday, January 06, 2003 11:49 AM
> Subject: RE: NEC-LIST: Small antennas: can they me multiply resonant?
>
>
> David
> If you define a small antenna as an antenna operated below its lowest
> natural resonant frequency, the question disappears (lumped components
must
> be disallowed).
> Alan
>
>
>
>
>
> -----Original Message-----
> From: David Jefferies [mailto:d.jefferies_at_surrey.ac.uk]
> Sent: 06 January 2003 17:02
> To: nec-list_at_gweep.ca
> Subject: NEC-LIST: Small antennas: can they me multiply resonant?
>
>
> Dear List,
>
> Revisiting the arguments about the CHU limit on Q for
> small (very small) antenna structures, in the light of
> my comments about multiple resonances, can a structure
> which is very much smaller than the radian sphere
> contain multiple radiating resonant elements, or is
> it necessarily the case that small antennas are only
> singly-resonant?
>
> regards
>
> --
> David Jefferies
> http://www.ee.surrey.ac.uk/Personal/D.Jefferies/
> http://www.eryptick.net/
> fax +44 (0)1483 534139 attn D.Jefferies
> --
> The NEC-List mailing list <nec-list_at_gweep.ca>
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>
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