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Please search for paper of Kin Lu Wong he studied difference for of PIFA antenna at more than 100 paper and he notice to miniaturization also u can find His book with title of Planar antenna that define every method clearly
for design wave guide at first u should design a box and then u must design a box in side it for define your waveguide thickness and subtract
by copy u can design a similar box as same as second box for your air
then you should define another box for...
the pattern direction is related to antenna size and condition so your ground at X direction and pattern shows null at this side so it look true
i hope it be helpful
i think your simulation have some problem
1) wave port usually not suggested for antenna simulation in hfss
2) radiation box is not modify for this frequency
ferdows_j@yahoo.com
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