quadrifilar helix antenna simulation

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v.mekaladevi

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QHA is designed for 137 mhz frequency in cst.simulation result shown the s11 paremeter at 480mhz.but the radiation pattern comes good at 137mhz.how to get return loss at 137mhz
give me suggestions on how to feed an qha antenna?reply me soon.in my design feed port is defined at the centre of the structure.
 

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