Design of a Compact Quad-Band Slot Antenna for Integrated Mobile Devices

In order to incorporate different communication standards into a single device, a compact quad-band slot antenna is proposed in this paper. The proposed antenna is composed of a dielectric substrate, T-shaped microstrip patch with a circle slot and an inverted L-slot, and a comb-shaped ground on the back of the substrate. By adopting these structures, it can produce four different bands, while maintaining a small size and a simple structure. Furthermore, a prototype of the quad-band antenna is designed and fabricated. The simulated and measured results show that the proposed antenna can operate over the 1.79-2.63GHz, 3.46-3.97GHz, 4.92-5.85GHz, and 7.87-8.40GHz, which can cover entire PCS (Personal Communications Service, 1.85-1.99GHz), UMTS (Universal Mobile Telecommunications System, 1.92-2.17GHz), WCDMA (wideband code-division multiple access, 2.1GHz), Bluetooth (2.4-2.48GHz), WiBro (Wireless Broad band access service, 2.3-3.39GHz), WLAN (Wireless Local Area Networks, 2.4/5.2/5.8GHz), WiMAX (Worldwide Interoperability for Microwave Access, 2.5/3.5/5.5GHz), and X-band SATcom applications (7.9 similar to 8.4GHz). The proposed antenna is particularly attractive for mobile devices integrating multiple communication systems.