International Symposium on Antennas and Propagation
A Printed Multi-Band Monopole Antenna for Wireless Applications
Shih-Ying Sun, Sheng-Yi Huang, Jwo-Shiun Sun,
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Antenna is one of the most important elements in communication system. They act as transmitting and receiving the electromagnetic (EM) energy. Printed antennas are very favorable candidates for wireless terminal devices application due to such characteristics as low-profile, lowprice, and easier fabrication [1-5]. A printed multi-band monopole antenna is designed for Bluetooth (BT) band of 2.4 GHz and Worldwide Interoperability for Microwave Access (WiMax) IEEE 802.16e band of 3.5 and 5.8 GHz. The impedance bandwidth of the designed antenna of 2.4 ? 4.2 GHz and 5.05 ? 5.9 GHz is referred to -10 dB Return Loss (RL). These covered frequency bands are also for Wireless Fidelity (WiFi) 2.4 - 2.5 GHz and 5 - 5.8 GHz and Wireless Local Area Network (WLAN) 2.4 - 2.48 GHz, 5.15 - 5.35 GHz, and 5.72 - 5.83 GHz application. The total volume of the antenna is 20 (L) x 7.64 (W) x 0.4 (H) mm3 , which is greatly reduced by 36 % compared to generally internal printed radiators. The ratio of impedance bandwidth of the antenna in relation to central frequencies (3.3 and 5.5 GHz) is 54.5 % and 15.5 %, respectively. The good performances of the antenna such as wide bandwidth and omni-directional farfield radiation patterns are attainable. The experimental results show fairly good agreement with the numerical data by High Frequency Structure Simulator (HFSS).