[求助]urgent need for Electric field distribution

Dear friends |zP~/  
I'm looking for some methods to uniform the E-field distribution. HDzeotD  
look at the first Image @jMo/kO/A  
One method is to change the width of the radiator  like the second Image ^OIo  
but,I really don't know why this changing cause to this distribution of Electric field!! m,q)lbRl  
Do you know why this happen? \I4Uj.'>\  
I need deep and good reasons for this. >.od(Fh{l|  
and the other question  : Z`GEF|eh  
Are there any other methods to Uniform the E-field distribution on the Radiato .. w_@{v wM$A  
;R2A>f~  

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any ideas?

I think it acts as a RF sheet resistor, dosen't it?  c2M  
m]>zdP+  
RF sheet resistance