two arm archimedean spiral antenna for uwb

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abdi1

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hi to every one, i want to design two arm archimedean spiral antenna for uwb application in cst mws, i feed it by using coaxial cable, i got good s11, but still i do not know how to analyse the axial ratio, impedance matching,radiation pattern and the surface current of the antenna, can any one please help me and give me some information about these problems
best wishes
abdi
 

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