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

Hi Stefan,

.The N type connector covers a higher range of frequencies than the BNC and
would yield a broader range of measurement in terms of frequency. Also, the
N-type connector is a better mechanical connection, since it is threaded.
BNC's are a little less dependable and more prone to fail. I would suggest
an N connector on the antenna.. If the spectrum analyzer you are using has
a BNC input, then it would be best to use a BNC connector on the antenna
feed cable to avoid having to use an extra BNC/N adaptor.

As far as information about biconical antennas is concerned, I can't suggest
any references at this moment since my antenna library is packed away in
boxes. I am currently looking for a new job. However, the biconical
antenna is pretty simple in that it has alot of similar characteristics to a
dipole, except over a broader range of frequencies due to it's "fatter"
construction. I also suggest that you feed it with a baun device to supress
the coax cable radiation.

All the best,
Roland
-----Original Message-----
From: Stefan Frank <stefrank_at_gmx.net>
To: nec-list <nec-list_at_gweep.ca>
Date: Wednesday, October 16, 2002 5:12 PM
Subject: NEC-LIST:nec2 newbie question: Biconical antenna

>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
>--
>The NEC-List mailing list <nec-list_at_gweep.ca>
>http://www.gweep.ca/mailman/listinfo.cgi/nec-list
>
>

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