dual band antenna

[baykus]

Hi,
I want to 868/915MHZ dual band antenna. What do you recommend for high-gain antenna ? Loop or microstrip or another.
Thanks.

 

[MacGyverS2000]

Can't say I've ever heard a microstrip in the 900MHz range considered "high gain"...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[baykus]

Ok.What can I do in the dual-band antenna design? Is there a type of antenna that you can suggest?

 

[MacGyverS2000]

If you tell us what you're trying to accomplish, we can provide more useful feedback. Otherwise, we're trying to hit a moving target.

Why do you need more gain than, say, a typical whip. Do you need omni-directional? Etc.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[baykus]

excuse me.I started learning the new antenna design.I do not know exactly what to ask why. I have to design omni-directional and dual-band antenna for 868/915 MHz.I am try to loop antenna using CST for 868MHz. But I do not know how dual-band. I hope you can help.

 

[VEBill]

Omni-directional combined with high gain implies a tall colinear array or similar. Omni gain. Not a Yagi, not a log periodic.

868 to 915 (nominally) is only about a 2.5% bandwidth around the middle 891.5 MHz. So, maybe treat it as a wide bandwidth antenna problem, which should be easier.

 

[baykus]

Thanks VE1BLL

 

[khiggler]

Bicone or monocone. 45 degree flair angle. Simplest antennas to build.

 

[fsmyth]

No gain.
and 30-37.5 degrees has a wider bandwidth.