I hope to design 2.4 Ghz Omni Antenna

I need to design 15 dB Omni Directional Antenna, or more.

I need to outline the design or detailed explanation, such as this
http://wireless.gumph.org/articles/homemadeomni.html

pleas help me​

 

How are you going to get 15 DB gain out out of an omnidirectional antenna?

 

look at
http://www.rason.org/Projects/collant/collant.htm is 9db

 

How are you going to get 15 DB gain out out of an omnidirectional antenna?

It's definitely going to be a collinear of some sort!

Eric

 

It's definitely going to be a collinear of some sort!

Eric

How narrow would the pattern have to be to get 15 dB in an OMNI?

Gain comes from concentrating radiation within a pattern (and taking radiation from outside the desired pattern). Just how far can we take this process and develop gain while keeping an omnidirectional pattern?

 

look at
http://www.rason.org/Projects/collant/collant.htm is 9db

The CLAIM is 9 dB. Most I have seen in a quality omni antenna is 7.5 dBd (so, maybe 9 dBi is possible - but not 15 dBd or dBi. I will believe otherwise when I see it.)

 

Some UHF TV broadcast antennas (slotted ring or panel) run that high a gain. But they are BIG.

Eric

 

Man, they are squeezing the pattern a LOT, ain't they?

I have not had college physics yet, that will come late this year or next - I was just wondering how much you'd need to concentrate the pattern to get 15 dB(i or d) gain...

I have a friend who is an associate engineer at http://www.munn-reese.com/
I'll email him. (He's their AM directional guy, too. Does some transmitter work, but mostly AM directional arrays. But they don't go to Alaska - mostly midwest and upper great plains.)

 

Man, they are squeezing the pattern a LOT, ain't they?

I have not had college physics yet, that will come late this year or next - I was just wondering how much you'd need to concentrate the pattern to get 15 dB(i or d) gain...

I have a friend who is an associate engineer at http://www.munn-reese.com/
I'll email him. (He's their AM directional guy, too. Does some transmitter work, but mostly AM directional arrays. But they don't go to Alaska - mostly midwest and upper great plains.)

This became quite common with the advent of HDTV. Most stations, if they're at any altitude, have to use some downward beam tilt, so the squashed pattern doesn't just skip over the top of the coverage area! But this is the only way they can get the required EFP, since it's SO expensive to generate any real power with DTV transmitters.

eric

 

How are you going to get 15 DB gain out out of an omnidirectional antenna?

It is possible, antennas at that high of frequency are small enough to stack several into an array, two that come to mind for omni-directional patterns would be a vertical colinear array, or stacked halos.