How to feed spiral slot antenna?

I have been trying to simulate a spiral slot antenna for UWB application and cannot figure out the correct way to feed it. I am pretty confident that the antenna geometry should give me much better results than I am currently getting.

Can someone tell me the proper way to feed this to get VSWR readings? Also, would I have to change the feed in order to get a radiation pattern measurement?

Thanks.

I have seen your project.why you use material ROGERS TMM 10i(tm).is it absorbing material.For feeding you should use the microstrip taper balun.

hi
can you please guide me in designing slot spiral antenna i-e how did you select different physical parameters if you have some paperz that can be useful for designing it then plz share it,thanks

It would help a lot if people knew what software you are using. You attach a file, in the rar format (which does not have a fully open specification), expecting people to download it, without knowing its contents.

Dave