suggest ideas to modify my design (broadband antenna)

I am doing project on the paper I have attached below.would any one suggest some ideas to modify the design for my proposed method

What do you mean by "to modify the design for my proposed method"...?

...this it is...!

the paper which i have sent is the reference paper.keeping this antenna as reference antenna i have to bring better some better results by making changes either in the geomentry of the antenna or by some other means.To overcome the drawbacks of this antenna