collinear polarization........

some of the mathematical expression like derivation part of an antenna array is quite easy, but little bit concentration compulsary.

You can read the "Antenna and Wave Propagation" by K.D.Prasad, in that from page No.400 to 456, you can find the relavent content, especially the concept of polarization is very very important for us. It is the fundamental concept, And you can find the similar content in A.P.Godse book also.... You can watch the polarization video in you tube also, just type "polarization" in the search box of youtube, then the lot of videos you can see..... have a nice day. read well.

You can read the book of "Elements of electromagentis" by sadiku. It is also helpful to you.