Re: NEC-LIST:nec2 newbie question: Biconical antenna

Hi Stefan,

Your model contains a lot of geometry warnings about segments
within the volume of other segments. This is happening down where
the radials meet the origin on both sides of the cone. Essentially
what this means is that the wire radius of one wire is encompassing
the segment(s) of an adjacent wire.

Also, the RP causes program execution and generation of the currents
so in your situation the XQ is not needed. This is trivial but
just thought I'd mention it.

I hope this helps.

Regards,

Joe
Nittany Scientific, Inc.

At 11:05 PM 10/16/02 +0200, you wrote:
>Hello list,
>
>I'm a student in electrical engineering and I try to create a
>biconical antenna for measurements at 900MHz and 1800MHz (GSM cell
>phones). I haven't found much information about biconicals (only in
>Kraus' book and an old article in the Microwave Journal from 1979
>about wire biconicals plus some web pages), so I'm not sure if I'm on
>the right way.
>The antenna should be connected to a spectrum analyzer via BNC or
>N-Connector (50 ohms).
>
>Criticism, hints, corrections are really appreciated :-)
>
>Thanks a lot,
>Stefan
>
>CM Biconical antenna
>CM Cone angle 30 deg.
>CE
>GW 1 14 0 0 0 .02381 0 .04125 .002
>GW 2 7 .02381 0 .04125 0 0 .04125 .002
>GR 1 8
>GM 0 0 0. 0. 0. 0. 0. .003
>GM 0 1 180. 0. 0. 0. 0. 0.
>GW 61 3 0 0 -.003 0 0 .003 .002
>GE 0
>EX 0 61 2 0 1.
>FR 0 36 0 0 500. 50.0
>RP 0 73 73 1001 -90. 0 5. 5. 10000.
>XQ
>EN
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>
>

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