Omni-Directional/Multi-Resonance CPW-Fed Small Slot Antenna for UWB Applications
Keywords:
CPW-fed microstrip slot antenna, multi-resonance performance, ultra wideband applicationAbstract
In this paper, a novel multi-resonance small slot antenna with CPW feed-line and square radiating stub, for UWB applications is proposed. The proposed antenna consists of a square radiating stub with an inverted T-shaped slot and a ground plane with a T-shaped slit, which provides a wide usable fractional bandwidth of more than 145 % (1.89 GHz ? 12.43 GHz). By cutting a Tshaped slit with variable dimensions on the ground plane, and an inverted T-shaped slot in the square radiating stub additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the lower and upper bands. The proposed antenna displays a good omni-directional radiation pattern even at higher frequencies. The designed antenna has a small size of 30×30 mm2. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range.
Downloads
References
H. Schantz, The Art and Science of Ultra Wideband Antennas, Artech House 2005.
J. Sze and K. Wong, “Bandwidth enhancement of a microstrip line-fed printed wide-slot antenna,” IEEE Trans. Antennas Propag., vol. 49, pp. 1020- 1024, 2001.
Y. Jang, “Experimental study of large bandwidth three-offset microstrip line-fed slot antenna,” IEEE Microw. Wireless Comp. Lett., vol. 11, pp. 425- 426, 2001.
M. Kim, Y. Suh, and I. Park, “A T-shaped microstrip line-fed wide-slot antenna,” in Proc. IEEE APS Int. Symp., pp. 1500-1503, 2000.
S. Ke, “Broadband proximity-coupled microstrip antennas with an H-shaped slot in the ground plane,” IEEE Antennas Propag. Symp. Dig., vol. 2, pp. 530-533, June 2002.
Y. Liu, K. Lau, Q. Xue, and C. Chan, “Experimental studies of printed wide-slot antenna for wide-band applications,” IEEE Antennas Wireless Propag. Lett., vol. 3, pp. 273-275, Dec. 2004.
Gh. Beigmohammadi, Ch. Ghobadi, J. Nourinia, and M. Ojaroud, “Small square slot antenna with circular polarisation characteristics for WLAN/WiMAX applications,” Electronics Lett., vol. 46, no. 10, pp. 672-673, May 2010.
F. Amini, M. Azarmanesh, and M. Ojaroudi, “Small semi-circle-like slot antenna for ultrawideband applications,” Progress In Electromagnetics Research C, vol. 13, pp. 149- 158, 2010.
Ansoft High Frequency Structure Simulation (HFSS), ver. 13, Ansoft Corporation, 2010.
M. Ojaroudi and A. Faramarzi, “Multiresonance small square slot antenna for ultra-wideband applications,” Microw. Opt. Technol. Lett., vol. 53, no. 9, pp. 2145-2149, Sep. 2011.
P. Li, J. Liang, and X. Chen, “Ultra-wideband elliptical slot antenna fed by tapered microstrip line with U-shaped tuning stub,” Microw. Opt. Technol. Lett., vol. 47, pp. 140-143, Oct. 2005.
