vary over a wide range the width of the radiating element can be as small as 2 mm and it can be as wide as 8 9 mm the smallest width of the ground plane should be just the width of the radiating element itself the maximum width of the ground plane can be slightly or much bigger than the width of the radiating element the minimum length of the ground plane should be just the length of the radiating element itself the maximum width of the ground plane can be slightly or much bigger than the length of the radiating element it is pertinent to point out that any reduction in the width of the radiating element needs to be adequately compensated by a proportional or corresponding increase in the length of the radiating element to realize the multi band resonance of pifa 10 in general the increase in the size of the ground plane has the effect of decreasing the resonant frequencies the above observation holds good uniformly to all the further embodiments of this invention also 0036 fig3 a and 3b show a tri ism band pifa 20 pifa 20 operates over frequency ranges 2 4 2 5 ghz 5 15 5 35 ghz and 5 47 5 725 ghz pifa 20 contains radiating element 11 ground plane 12 feed tab 13 short 14 parasitic element 15 and a tuning stub 16 pifa 20 may have a feed tab extension 13 c attached to feed tab 13 fig3 b shows pifa 20 in a.