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Best Directional Antenna - 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

 Post subject: Best directional antenna
Posted: Tue Dec 28, 2004 3:11 pm 
I'm looking for what the best type of antenna is for high directivity. I'm looking to do a Tx/Rx system with very narrow line-of-sight in ISM900 MHz band, and want to minimize signal power off the beam sight line. Thanks.

- Clyde

 Post subject:
Posted: Mon Jan 10, 2005 1:23 pm 

 Post subject:
Posted: Wed Jul 27, 2005 4:31 pm 

Joined: Wed Jul 27, 2005 3:19 pm
Posts: 2
Try Log-Spiral one.

 Post subject:
Posted: Tue Aug 09, 2005 1:05 pm 
apr wrote:
Try Log-Spiral one.

a planar log spiral is not directional! A conical log-spiral is. However, it'll be broadband and circularly polarized.

If you want linear polarization, a Yagi-Uda antenna is indeed preferrable

 Post subject:
Posted: Tue Aug 09, 2005 1:10 pm 
Agree. This is what I was thinking about. Thank you.

Posted  11/12/2012

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