Re: NEC-LIST:STACKED DIPOLES

some basic ways..
A phasing network between the dipoles, feeding the bottom dipole at the
bottom. Often, this just takes the form of a helically wound "spring" of
suitable length (you need an electrical half wavelength, or so). Some cut
and try or modeling is necessary. There are some examples in the ARRL
antenna book. Also, lots of vehicular cellular antennas look like this..

Separate dipoles fed separately from an impedance matching network. You can
then use sleeve dipoles, for instance, and run the coax up the center.

You might want to take a look at "twelfth wavelength" matching
configurations, which are fairly convenient, but I'm not sure if you'll get
16% bandwidth.

Other strategies, somewhat similar, are a turnstile configuration (esp in a
"bat wing") with multiple bays, a Lindenblad (3 or 4 angled dipoles in a
circle)

----- Original Message -----
From: "zvi frank" <zvi_f_at_mti-group.co.il>
To: "NEC LIST (E-mail)" <nec-list_at_ee.ubc.ca>
Sent: Monday, April 22, 2002 7:41 AM
Subject: NEC-LIST:STACKED DIPOLES

> Hi Everyone,
> I need to make a VHF >3dBi Omni antenna with about 16%
> bandwidth. I understand this can be done with stacked dipoles. Any ideas
on
> how to connect these together? Thanks in advance ,
>
> Zvi
> --
> The NEC-List mailing list <nec-list_at_gweep.ca>
> http://www.gweep.ca/mailman/listinfo.cgi/nec-list

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