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3-6 GHz Dipole antennas - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


dle1975
 Post subject: 3-6 GHz Dipole antennas
Posted: Thu Jun 10, 2010 10:27 am 
 
Lieutenant

Joined: Thu Jun 10, 2010 10:23 am
Posts: 1
Does anyone know where I could find one or more 1/2 wave dipoles that would cover the frequency range from 3 GHz to 6 GHz?

thanks,

David


 
   
 
nubbage
 Post subject: Re: 3-6 GHz Dipole antennas
Posted: Fri Jun 18, 2010 10:32 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 236
Location: London UK
Hi David
the term for what you are looking for is "a discone" so try a search engine for that.
If I needed something quickly, I would take a length of 10mm copper pipe cut as half wavelength for 4.5 GHz (35 mm length) then feed it parasitically through a parallel strip of copper, 20mm long, spaced about 2 or 3mm away. To do this use semi-rigid coax running inside one arm of the 35mm tube and out through a small clearance hole about 10 mm from the center line. The outer of the coax is soldered to the 10mm diam pipe at the hole, and the inner goes to the end of the copper strip. The other end of the copper strip (transformer) is bent down as a small tab capacitor near to the 10mm diam dipole. This should cover an octave bandwidth with a fairly good S11

_________________
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karthik
 Post subject: Re: 3-6 GHz Dipole antennas
Posted: Sun Jun 20, 2010 12:24 am 
 
Colonel

Joined: Tue Apr 11, 2006 8:13 pm
Posts: 34
If you are not particular about the type of antenna (i.e, dipole), you will find a ton of designs for ultrawideband antennas which will cover that bandwidth. Different designs will have different gains/ radiation patterns in that bandwidth though..






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