Triple-Band Antenna help

Hi,
I am designing a triple-band antenna for both GSM900/1800 and Bluetooth, and I want to know which antenna is suitable for such antenna whose Gain is also required to be 2dBi plus. Now I choose one Folded PIFA, which works for GSM/DCS/Bluetooth Triple-Band Application.
The paper is here,
https://www.edaboard.com/viewtopic.php?p=569370#569370

Thanks for your help.

please see the attached paper

Thank you.

hi unicorn_yun,

I've tried to simulate but i couldnt get expected results as mentioned in paper.
Do u get good result?
Which simualtor r u using?

https://www.edaboard.com/viewtopic.php?p=569370#569370

I cannot get the results as the paper said either. I found that when I adjusted the position of v1 and v2, I could adjust the frequency of Bluetooth.

I use HFSS to simulate the antenna project.

A Vialdi has more than enough bandwidth and is easily able to produce more than 2 dBi.

I've simulated with the help of ie3d.
I didnt get expected results,
attached here is the RL plot.

regards,
balaguru.