Message-ID: <005b01c082f1$d30938a0$401686d4@ericadodd>
From: "g3ldo" <g3ldo@ukonline.co.uk>
To: rsgb_lf_group@blacksheep.org
References: <200101181624_MC2-C22B-D97E@compuserve.com>
Subject: LF: Re: Loading Coils
Date: Sat, 20 Jan 2001 14:46:11 -0000
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Sender: <majordom@post.thorcom.com>

Roger, G2AJV, said

>The loading coil is not just a matching device, it is also a primary source
>of vector potential and it is the vector potential, rather than its
>offspring, the magnetic and electric fields, which is the fundamental
>source of electromagnetic radiation.


Could I ask what 'Vector Potential' is?

According to the IEE Handbook of Antenna Design:

"It is convenient when working with some antennas to introduce the concept
of a vector potential, A.
Many problems can be solved by the use of the vector potential because the
expressions for the vector potential are much simpler than those for
electric and magnetic fields. The fields can always be derived from the
vector potential;  B = (nabla) x A"

>From this it would appear that vector potential is a mathematical device to
simplify electromagnetic calculations rather than an entity generated by the
loading coil itself.

Regards,
Peter, G3LDO

<g3ldo@ukonline.co.uk>

p.s.
Please note my change of e-mail address.