Summary
International Symposium on Antennas and Propagation
2009
Session Number:3A4
Session:
Number:3A4-1
Rectangular Ring Antenna Fed by Broadband Electric Probe above Elliptical Reflector for WiMAX Systems
S. Kosulvit, S. Vongsack, S. Lamultree, K. Phaebua, T. Pumpoung, P. Keowsawat, K. Chawanonphithak, C. Phongcharoenpanich, M. Krairiksh,
pp.811-814
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
Low-profile antennas are especially suitable for modern mobile devices: for instance, handheld and laptop computers having a Wireless Local-Area Network (WLAN) module supporting a Worldwide Interoperability for Microwave Access (WiMAX) [1], [2] function. This can keep with the current trend and it is treated as an extension and upgrade to the WLAN module. For these devices, it is usually necessary for the antenna to have multiple impedance-matching bands, such as 2400?2484 MHz (specified by IEEE 802.11b/g) and 2500?2569 MHz (specified by IEEE 802.16e). Recently, antenna designs for WiMAX application have been proposed and studied in literature [3]. A large number of such antennas have been proposed and it is often with size that may be too large for practical installation. In literature, some ring antennas had also been proposed [4]-[6]. The rectangular ring antenna is one of good choices of the compact and simple structure. This paper proposes a rectangular ring antenna fed by broadband electric probe above an elliptical reflector for applying as an antenna at the base station of WiMAX systems. The basic configuration of the proposed antenna is first presented. The impedance bandwidth in terms of |S11| as well as gain, and radiation pattern at the selected frequency for WiMAX systems are investigated by using the CST Microwave Studio [7]. The prototype antenna was fabricated and measured to verify the simulation results. It is found that the simulated and measured results are in good agreement. The proposed antenna is a suitable candidate for WiMAX base station systems.