rf - Circular polarized micro-strip patch antenna

Circular/ Elliptical patch antenna design after a bit more research I realized what my mistake was, after a user pointed it out. As such my new post.

I have come across a CIRCULAR POLARIZED PATCH ANTENNA DESIGN (FINALLY!). Which is shown below. However, as you can see there is very little data that is shown on how to exactly construct such an antenna. My frequency is 915MHz, input impedance is 50 ohm.

My questions are (i.e. what are the equations?):

1. 
   

   The patch design is easy as I know of many resources that can assist me. But how do you calculate the width of the microstrip feed?

   
   


2. 
   

   How do you calculate the position of where the microstrip intercepts the patch antenna?

   
   



3. 
   

   How do you calculate the exact position of where the second feed line braches of the main feed line to form the 90degree out of phase feed line?