PIFA (Planar Inverted-F Antenna) antennas are widely used in mobile communication due to their compact size and efficient performance. They are designed to operate at microwave frequencies and are characterized by a planar structure with a shorting wall that forms an inverted-F shape. PIFA antennas are popular in mobile devices like smartphones because they can be easily integrated into the device's circuit board, offering good radiation efficiency and bandwidth. Their low profile and ability to be tuned to specific frequencies make them suitable for diverse mobile communication standards such as GSM, LTE, and Wi-Fi.