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

Just to add something that I'm sure Davor knows but didn't say:

Biconical dipoles and discones are both broadband dipoles. They both
broadband a conventional half wave dipole by virtue of a tapered "fat"
element. Discones are popular at higher frequencies because of the solid
surface of the elements being better behaved than individual wire elements.
I don't have it readily available, but there was a good paper in the IEEE
Transactions on Antennas and Propagation a couple of years back on the
modeling of a skeletal biconical with NEC. They struggled quite a bit to
make the model match the real thing (a Rhode & Schwarz if I remember
correctly). I tried to reproduce their work and found similar problems
trying to model an EMCO 3108.

Brent

-----Original Message-----
From: nec-list-admin_at_gweep.ca [mailto:nec-list-admin_at_gweep.ca]On Behalf
Of Davor Virkes
Sent: Thursday, October 17, 2002 12:42 AM
To: nec-list_at_gweep.ca
Subject: Re: NEC-LIST:nec2 newbie question: Biconical antenna

Hi,

>The antenna should be connected to a spectrum analyzer via BNC or
>N-Connector (50 ohms).

Discones are much better suited for excitation with coax, and are easily
built. In this configuration, it could be designed as a snap-on, and used
as a handy reference antenna for signal level measurements eg. for micro
and pico cells.

Davor

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