The present disclosure relates to a reconfigurable patch antenna, which includes a substrate, a ground plane formed on a bottom surface of the substrate or within the substrate, a primary patch, an extension patch, and switching components. The primary patch and the extension patch are formed on a top surface of the substrate and are placed parallel to each other. Herein, a gap is formed between the primary patch and the first extension patch. The switching components are formed across the gap, electrically coupled to both the primary patch and the extension patch, and configured to connect the primary patch to the extension patch or disconnect the primary patch from the extension patch.