A small tip: For designing microstrip patch antennas, first you need to know on what substrate are you planning to use. Because the guided wavelength, the characteristic impedance depend on the height of the substrate, dielectric constant and even the width of the conductor is important. Go through the tutorials(emtalk.com), once you figure out the required dimensions, it is really easy to design in HFSS.
actually i juste learned how to make a simple patch but the problem is how to make an array of two so i have to design a T junction and i dont know how to do it . plz help