With the proliferation of mobile phone applications, the demand for compact and lightweight antennas has grown significantly. To address this need, the concept of a multiband antenna is advocated, and we introduce the term "reconfigurable antenna" to characterize the antenna we have developed. Our research has shown that employing a reconfigurable antenna can substantially reduce the physical dimensions of a multiband antenna, enabling versatile operation across various frequency bands. This reconfigurability is achieved through the integration of a spiral structure with diodes in conjunction with a Planar Inverted F antenna. By strategically manipulating diode configurations and shifting between frequency bands, we have observed a remarkable enhancement in antenna performance.