Is this antenna to understand certain antennas, or to get a solution as soon as possible?
Understanding antennas takes time and you learn nothing by using copy / paste. If you just need a single antenna, just buy it.
What do you need: Single patch antenna, linear or circular polarized? Are there gain and/or size requirements, omnidirectional, etc?
In case of a patch antenna you may search for: patch antenna design. Note that if you want to scale an existing design, you also need to scale substrate thickness. If you can't completely scale, you need to adjust the measures based on experimentation or simulation.