Triangular lattice of microstrip antenna

Dear Buddy,

What is the purpose of arraging the microstrips in traingular lattice in an array?

Is there any open source software to design a microstrip antennae?

purpose of arraging the microstrips in traingular lattice in an array

http://www.elec.qmul.ac.uk/antennas/...ionsystems.pdf
http://www.ursi.org/proceedings/proc...pers/B02p4.pdf

lab mannual for open source software to design a microstrip antennae

http://rze-falbala.rz.e-technik.fh-k...0LabManual.pdf
try these...

Thank You Sapna