[求助]urgent need for Electric field distribution

Dear friends BH^cR<<j  
I'm looking for some methods to uniform the E-field distribution.  Mv%B#J  
look at the first Image u7wZPIC{_  
One method is to change the width of the radiator  like the second Image 8r.MODZG/  
but,I really don't know why this changing cause to this distribution of Electric field!! huin?,eGz  
Do you know why this happen? 6>d3*  
I need deep and good reasons for this. )A;jBfr  
and the other question  : +I~U8v-  
Are there any other methods to Uniform the E-field distribution on the Radiato .. DqH]FS?]  
H
Ba6Y&)<  

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any ideas?

I think it acts as a RF sheet resistor, dosen't it? ?g<*1N?:  
D Zh6/n#q  
RF sheet resistance