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Electronics Forum / CAD / July 2008


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Model of Loopstick Antenna??

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Jim Thompson - 30 Jun 2008 03:43 GMT
Is the proper model of a loopstick antenna an inductance with a
voltage source in series (representing the signal)?

Or would something else be a better representation?

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Wimpie - 30 Jun 2008 09:19 GMT
On 30 jun, 04:43, Jim Thompson <To-Email-Use-The-Envelope-I...@My-Web-
Site.com> wrote:
> Is the proper model of a loopstick antenna an inductance with a
> voltage source in series (representing the signal)?
[quoted text clipped - 13 lines]
> |                                                                |
> |  Due to excessive spam, googlegroups, UAR & AIOE are blocked!  |

Hello Jim,

Whether an inductor is a reasonable model depends on what you do and
what you want. I would use at least an RLC approach (all in parallel
and a voltage source in series with the L or current source parallel
to the RLC circuit).

The reason for this is that around the resonant frequency your input
amplifier may show strange behavior (oscillation?) that you may
overlook by just using an inductor.

For modeling the frequency dependent core losses, you need a higher
order model. In most cases that is not required.

Best regards,

Wim
PA3DJS
www.tetech.nl
the email does work when you remove abc.
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Robert Baer - 01 Jul 2008 06:41 GMT
> Is the proper model of a loopstick antenna an inductance with a
> voltage source in series (representing the signal)?
>
> Or would something else be a better representation?
>
>                                         ...Jim Thompson
  Add a frequency dependent resistance in series, and a capacitance in
parallel to that (at minimum)...
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JosephKK - 05 Jul 2008 00:07 GMT
>Is the proper model of a loopstick antenna an inductance with a
>voltage source in series (representing the signal)?
>
>Or would something else be a better representation?
>
>                                        ...Jim Thompson

Depending on what you wanted to model. you could also add a large
stack of modulated sources.   Consider resonant antennas, adjacent
channel interference, image rejection, and similar issues as needed.
Model what is needed for the design in question.
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