http://www.stormcam.org/antenna-array/
How can you get omnidirectional patterns from a circular array fed from a butler matrix?
I can easily see how you can get directional beams when feeding a butler matrix output into a linear antenna array, and I believe that doing the same to a circular array gives you an omni pattern but I can’t see how? You’d think it might be possible to get 1 mode to work with careful planning but the things just seem to work with any size circular array and any mode (notwithstanding tolerance means the high order modes fall apart, or there not being enough elements to make it look circular). Theres got to be something obvious I’m missing here but I can’t see what.
What you need is dual technology cable, mixed fibre / pure copper using high output digital / analogue field transmitters.
When these are placed in a circular node, they transmit annul signals in a compound fashion which can be measured with a standard hornbeam compass generator.
Phased Array – Steered Antenna Radiation Pattern