This paper presents a compact planar inverted-F antenna (PIFA) designed to cover the bands of the existing wireless networks with standards such as Wireless Local Area Network (WLAN) in USA (5.15–5.35 GHz, 5.725–5.825 GHz), HIgh PERformance radio Local Area Network /2 (HIPERLAN/2) in Europe (5.15–5.35 GHz, 5.47–5.725 GHz) and Worldwide Interoperability for Microwave Access (WiMAX) (5.25–5.85 GHz). The PIFA antenna provides a good reflection coefficient equal to −26.07 dB and a broad bandwidth of 690 MHz. The antenna is characterized with reflection S-parameter, surface current distributions, and radiation patterns.