RE: NEC-LIST: Zero-Q antenna

Edward
Thank you for the reply. All replies so far have been negative towards the
Grimes & Grimes work. Is there anybody on the list who thinks their results
are right?
Alan

-----Original Message-----
From: Dr. Edward P. Sayre [mailto:esayre_at_nesa.com]
Sent: 21 January 2003 17:02
To: alan.boswell_at_baesystems.com; Edward.Altshuler_at_hanscom.af.mil;
nec-list_at_gweep.ca
Subject: RE: NEC-LIST: Zero-Q antenna

Alan:

I have to amplify what Ed Altschuler says. Harrington's work on Antenna Q
and bandwidth proceeds from first principles and sets the relationships
between bandwidth and Antenna Q. Zero Q antennas are physically and
network theory based unrealizable elements.

ed sayre
================================

At 01:52 PM 1/21/2003 +0000, alan.boswell_at_baesystems.com wrote:
>Ed
>I am ready to believe what you say but it would be helpful if you could
>summarise the main points of the Collin paper saying why you think the
>Grimes papers are faulty.
>Thanks
>Alan
>
>
>
>-----Original Message-----
>From: Altshuler Edward E Civ AFRL/SNHA
>[mailto:Edward.Altshuler_at_hanscom.af.mil]
>Sent: 21 January 2003 13:27
>To: 'alan.boswell_at_baesystems.com'; ccc_at_space.mit.edu; nec-list_at_gweep.ca
>Subject: RE: NEC-LIST: Zero-Q antenna
>
>
>Dear Colleagues,
>
>Unfortunately the Grimes & Grimes papers are filed with misconceptions and
>errors that lead them to invalid results. For those who are interested I
>refer you to an excellent paper by Prof. Robert E. Collin on "Minimum Q of
>Small Antennas," Journal of Electromagnetic Waves and Applications, Vol.
12,
>1369-1393, 1998.
>
>Ed Altshuler
>
>-----Original Message-----
>From: alan.boswell_at_baesystems.com [mailto:alan.boswell_at_baesystems.com]
>Sent: Monday, January 20, 2003 4:51 AM
>To: ccc_at_space.mit.edu; nec-list_at_gweep.ca
>Subject: RE: NEC-LIST: Zero-Q antenna
>
>
>Chuck
>Quote: An ensemble of four dipoles, two electric and two magnetic ones,
one
>of each type lying along each of the x- and y-axes. More details are said
>to be in the 2000 paper in MOT Letters. They say there is strong
intermodal
>coupling between the x-directed electric moment and the y-directed magnetic
>moment, and vice versa (I think that's questionable).
>Alan
>
>
>-----Original Message-----
>From: Chuck Counselman [mailto:ccc_at_space.mit.edu]
>Sent: 17 January 2003 18:05
>To: alan.boswell_at_baesystems.com
>Subject: Re: NEC-LIST: Zero-Q antenna
>
>At 2:01 PM +0000 1/17/03, alan.boswell_at_baesystems.com wrote:
> >Has anyone seen / modelled / experimented with the "zero-Q antenna"
> >proposed by Grimes et al in Microwave and Optical Technology
> >Letters, vol. 28 no. 3, Feb. 5, 2001, also in vol. 27 pp. 53-58
> >(2000)?
>
>I haven't; sorry; but I wish, and I bet others do, too, that you
>would post a summary of what it is and how it works, to the list.
>
>Tnx -chuck.
>
>
>
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