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What is the difference between orthogonal antenna and omni-directional antenna?

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vedaprabhu

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What is the difference between orthogonal antennas and omni directional antenna?
 

Re: Antenna pattren

As far as I know there is no relation between orthogonal antennas and an omni-directional antenna.

I guess, orthogonal antennas refer to the antennas which have orthogonal patterns in space. And omni-directional antenna is one which have more or less a circular pattern in azimuth plane and directional pattern in elevation (example: donut-shape).
 

Re: Antenna pattren

I think I know what you refer about.
For example if you are using two-cross dipoles (turnstile antenna) which are orthogonal one to each other, the antenna pattern suffer a little bit from the perfect circle omni directionality, which has for example a ground-plane antenna.

The orthogonal antennas can replace in a lot of applications a perfect circle-pattern antenna.
 

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