How to increase the bandwidth of a loop antenna ?

Hi

I am designing an loop antenna to work at 434MHz. I get a very narow bandwidth less that about 1MHz with a taped capacitors.

I want atleast 3-4 MHz. suggest me a way i can increase bandwidth. Also what are the advantages and disadvantages of using a cross loop antenna.

Can i simulate these antenna design in HFSS and extract the inductance,resistance etc.

Help would be greatly appreciated.

Thanks