PCB printed antenna

Is there any program or paper which could help designing PCB printed antennas? basically interested in unidirectional or omnidirectional antenas
These are very compact antenas

http://www.ansoft.com/products/hf/hfss/
http://www.cst.com/
http://www.zeland.com/
http://www.feko.info/
http://www.sonnetsoftware.com/
http://www.axiem3d.com/home.shtml