One of the critical enablers of the ever-growing wireless communication and radar technologies revolution is the low-cost, high-gain antenna, specifically, the uniform linear array (ULA) antenna. However, the ULAs have a critical issue called grating lobe that limits array designs. This dissertation thoroughly discusses this issue, presenting different methods to push the antenna array design beyond the conventional limits, especially in the microstrip patch ULAs.The first proposed solution is based on suppressing the wave propagating toward the grating lobe direction along the array aperture...