Electrically Small Modified Planar Inverted-F Antenna

A novel modified planar inverted-F antenna (PIFA) is designed on a cylindrical FR4 substrate with dimensions 50 mm (diameter) x 4 mm (thickness). The optimized design is extremely electrically small, with a measured voltage standing wave ratio (VSWR) 3: 1 bandwidth of 49 MHz at 530 MHz, and can be scaled down in physical size to operate in the 2.45 GHz band.