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Add another ground plane next to your CPW fed slot antenna and it will surely reduce the bandwidth. Certainly, you will need to tune it again because it will change the performance of the antenna.
I am not sure whether I still have it. Please send it to me and tell me your goal. You can send it to jian@zeland.com. I am on travel. I may not be able to reply you soon because I can't access my e-mail even though I can access Internet here. Thanks!
Best regards,
Added after 2 hours 31 minutes:
Hi, kbmanick:
I did not realize that your question was about beamwidth instead of bandwidth (your last question was for bandwidth and beamwidth). Anyway, adding ground plane will also decrease the beamwidth, as well as bandwidth. Certainly, adding more element is the most efficient way to reduce beamwidth. That is a well known fact anyway.
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