Bandwidth Improvement of Omni-Directional Monopole Antenna with a Modified Ground Plane
Keywords:
Omni-directional radiating patterns and printed monopole antennaAbstract
This study introduces a new design of low profile, multi-resonance and omni-directional monopole antenna for Ultra-Wideband (UWB) applications. The proposed antenna configuration consists of an ordinary square radiating patch and a ground plane with pairs of inverted fork-shaped slits and inverted ?-shaped parasitic structures, which provides a wide usable fractional bandwidth of more than 135%. By cutting a pair of inverted fork-shaped slits in the ground plane and also by inserting a pair of inverted / -shaped conductorbacked plane in the feed gap distance, additional resonances are excited and hence much wider impedance bandwidth can be produced; especially at the higher band. By obtaining the third and fourth resonances, the usable lower frequency is decreased from 3.12 GHz to 2.83 GHz and also the usable upper frequency of the presented monopole antenna is extended from 10.3 GHz to 14.87 GHz. The proposed antenna has symmetrical structure with an ordinary square radiating patch; therefore, displays a good omni-directional radiation patterns, even at the higher frequencies. The antenna radiation efficiency is greater than 87% across the entire radiating band. The measured results show that the proposed antenna can achieve the Voltage Standing Wave Ratio (VSWR) requirement of less than 2.0 GHz in frequency range from 2.83 GHz to 14.87 GHz, which is suitable for UWB systems.
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References
FCC News release, FCC NEWS (FCC 02-48), February 14, 2002.
D. Cheng, “Compact ultra-wideband microstrip resonating antenna,” US patent7872606, January 2011.
M. Mighani, M. Akbari and N. Felegari, “A novel SWB small rhombic microstrip antenna with parasitic rectangle into slot of the feed line,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, no. 1, pp. 74-79, January 2012.
M. N. Jahromi and N. K. Barchloui, “Analysis of the behavior of Sierpinski carpet monopole antenna,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 24, no. 1, pp. 32-36, February 2009.
W. C. Weng, “Optimal design of an ultra-wideband antenna with the irregular shape on radiator using particle swarm optimization,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, no. 5, pp. 427-434, May 2012.
G. Zhang, J. S. Hong, B. Z. Wang and G. Song, “Switched band-notched UWB/WLAN monopole antenna,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, no. 3, pp. 256- 260, March 2012.
R. Azim, M. T. Islam and N. Misran, “Design of a planar UWB antenna with new band enhancement technique,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 26, no. 10, pp. 856-862, October 2011.
C. Y. D. Sim, W. T. Chung and C. H. Lee, “Planar UWB antenna with 5 GHz band rejection switching function at ground plane,” Progress In Electromagnetics Research, vol. 106, pp. 321-333, 2010.
N. Behdad and K. Sarabandi, “A compact antenna for ultra-wideband applications,” IEEE Transactions on Antennas and Propagation, vol. 53, pp. 2185-2192, 2005.
A. J. Kerkhoff, R. L. Rogers and H. Ling, “Design and analysis of planar monopole antennas using a genetic algorithm approach,” IEEE Trans Antennas Propag., vol. 2, pp. 1768-1771, 2004.
Ansoft high frequency structure simulation (HFSS), ver. 13, Ansoft Corporation, 2010.
K. Chung, T. Yun and J. Choi, “Wideband CPWfed monopole antenna with parasitic elements and slots,” ElectronicsLetters, vol. 40, no. 17, pp. 1038-1040, 2004.
W. L. Chen, G. M. Wang and C. X. Zhang, “Bandwidth enhancement of a microstrip-line-fed printed wide-slot antenna with a fractal-shaped slot,” IEEE Transactions on Antennas and Propagation, vol. 57, pp. 1276-2179, 2009.
R. Azim, M. T. Islam and N. Misran, “Compact tapered-shape slot antenna for UWB applications,” IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 1190-1193, 2011.
Y. Li, W. Li and Y. Lu, “A switchable UWB slot antenna using SIS-HSIR and SIS-SIR for multimode wireless communications applications,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, pp. 340-351, 2012.
L. Liu, S. W. Cheung and T. I. Yuk, “Compact MIMO antenna for portable devices in UWB applications,” IEEE Transactions on Antennas and Propagation, vol. 61, pp. 4257-4264, 2013.
M. Ojaroudi and N. Ojaroudi, “Ultra-wideband small rectangular slot antenna with variable bandstop function,” IEEE Trans. Antennas Propag., vol. 62, pp. 490-494, 2014.
X. N. Low, Z. N. Chen and T. S. P. See, “A UWB dipole antenna with enhanced impedance and gain performance,” IEEE Transactions on Antennas and Propagation, vol. 57, pp. 2966-2959, 2009.
N. Ojaroudi and M. Ojaroudi, “Small monopole antenna with multi-resonance characteristic by using rotated t-shaped slit and parasitic structure for UWB systems,” Microw. Opt. Technol. Lett., vol. 55, pp. 482-485, 2013.
A. K. Gautam, S. Yadav and B. K. Kanaujia, “A CPW-fed compact UWB microstrip antenna,” IEEE Antennas and Wireless Propagation Letters, vol. 12, pp. 151-154, 2013.
N. Ojaroudi, “Design of ultra-wideband monopole antenna with enhanced bandwidth,” 21st Telecommunications Forum, TELFOR 2013, Belgrade, Serbia, pp. 1043-1046, November 27-28, 2013.
N. Ojaroudi, “A new eesign of koch fractal slot antenna for ultra-wideband applications,” 21st Telecommunications Forum, TELFOR 2013, Belgrade, Serbia, pp. 1051-1054, November 27-28, 2013.
N. Ojaroudi, “Compact UWB monopole antenna with enhanced bandwidth using rotated l-shaped slots and parasitic structures,” Microw. Opt. Technol. Lett., vol. 56, pp. 175-178, 2014.
N. Ojaroudi, S. Amiri and F. Geran, “A novel design of reconfigurable monopole antenna for UWB applications,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 28, no. 6, pp. 633-639, July 2013.
N. Ojaroudi, “Application of protruded strip resonators to design an UWB slot antenna with WLAN band-notched characteristic,” Progress in Electromagnetics Research C, vol. 47, pp. 111- 117, 2014.
N. Ojaroudi, “Microstrip monopole antenna with dual band-stop function for UWB applications,” Microw. Opt. Technol. Lett., vol. 56, pp. 818-822, 2014.
N. Ojaroudi, “Small microstrip-fed slot antenna with frequency band-stop function,” 21st Telecommunications Forum,” TELFOR 2013, Belgrade, Serbia., pp. 1047-1050, November 27- 28, 2013.
