HELP: How to increase the bandwidth of path antenna

hello everybody,

i'm study a path antenna at 2.4GHz but now i want to know how to increase the bandwidth beetween 2.4 GHz and 2.5 GHz.

thanks

U can either use the
1) slot in the ground
2)multi substrate
3) Thick substrate

For clear understanding of Bandwidth enhancement techniques go through Compact and Broad Band Microstrip antennas by kin-Lu-wong.

Attached here is the antenna design from above book.