S-shaped High Efficient Meander Monopole Antenna for WLAN/WIMAX/Ultra Wide Band (UWB) Applications

In this paper, a low cost, high efficient, ultra-wideband (UWB), S-shaped monopole antenna is designed and implemented. It can present meander new logical structure antenna which uses a coupling mechanism to improve the bandwidth of operating frequency. The total size of the antenna is 41×39×1.57 mm3. The antenna is operating in S/C/X bands with a wide bandwidth of 12.55 GHz (2.9–15.45 GHz) and suitable for wireless local area network (WLAN), Worldwide Interoperability for Microwave Access (WiMAX), and for ultra-wideband (UWB) applications. It is a multifunctional antenna that can be used to reduce the use of multiple antennas in a wireless communication network. Monopole antenna is used because it has multiple applications for UWB. The antenna is simple in structure, wide bandwidth, acceptable omnidirectional properties, ease of fabrication, light weight and a low cost. Waveguide transformer is used in the feeding line of the antenna. The simulated and measured results show that the antenna has 137% fractional bandwidth and 5.96 dBi gains are achieved at 9 GHz in the operating frequencies.