Omnidirectional Circular Polarized Antenna...

[antenna microwave]

Hello everyone...I'm new here..so if i make mistake...please forgive me..i have a question...someone can tell me can we make a circular polarized omnidirectional microstrip antenna?
whether the antenna will work in omnidirectional circular polarized..? sory for my english

 

[thylacine1975]

I'm going to be so bold as to say... no

(That is to say, I've spent some significant effort trying! [If someone knows of a way it can be done, I'll swallow my pride and beg to learn how you did it!])

Anything I've constructed out of microstrip shows patterns consistent with dipoles/slots or the hemispherical shapes characteristic of classical patch antennas - wire antennas/antenna arrays would be a better bet for something approaching an omnidirectional pattern. I'd expect maintaining strict circularity over the entire radiation sphere will be a challenge though - the 'crossed dipole' (e.g. lindenblad) approach exhibits linear polarisations at certain angles, for example. There *might* be a turns/aspect ratio combination for the quadrifilar helix that will result in a-close-to omnidirectional pattern, but I'm not confident...

Good luck!