NEC-LIST: How to design a feed network for a microstrip array?

Hi all,
  I have designed two microstrip antennas. They have
different size and cover different frequency bands
(610MHz-960MHz and 1350MHz-1850MHz respectively), but
their input impedances are the same, about 90 ohm at
their working frequency bands. Now I try to integrate
them on one PCB as an antenna array. I don't know how
to design the array, especially how to design a feed
network.
   Thanks,
              
               Xingc

                
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