What kind of Microwave Antennas are used in a BTS?

As we know that there are different types of microwave antennas like wire, yagi-uda, parabolic antenna etc etc..... But can anyone pls tell me which kind of antenna is used in BTS Towers?

And also what does the rectangular antenna and circular antenna mean in BTS?

Thanks alot.

multiple-input multiple- output MIMO antenna
you can read chapter 20 Antenna technology
in

Get Certified
A Guide to Wireless Communication
Engineering Technologies

Edited by
Syed A. Ahson
Mohammad Ilyas

hi BTS antenna is microstrip array antenna and it usually contain 8 number and rectangular and circular are the kinds of them

Hi imaasac,

Antennas which are normally used in BTSs are arrays of microstrip elements but their elements are a bit different from ordinary microsrtip antennas and the number of elements depend on the total gain and vertical beamwidth they need. The elements are normally cavity backed and dual or triple band frequency.

Cheers
Hadi