UWB Square Monopole Antenna with Omni-Directional Radiation Patterns for Use in Circular Cylindrical Microwave Imaging Systems
Keywords:
Circular cylindrical microwave imaging systems, L-shaped conductor back plane, L-shaped slot, square monopole antenna, UWB antennaAbstract
In this paper, a novel ultra-wideband printed monopole antenna (PMA) for the use in a circular cylindrical microwave imaging system is presented. The proposed antenna consists of a square radiating patch and a ground plane with a pair of L-shaped slots and two L-shaped conductor back plane, which provides a wide usable fractional bandwidth of more than 130 % (3.02 GHz - 15.21 GHz). By cutting two modified Lshaped slots with variable dimensions on the ground plane corners and also by inserting two Lshaped conductor back plane on the other side of the substrate, additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the higher band. The proposed antenna has an ordinary square radiating patch, therefore displays a good omni-directional radiation pattern even at higher frequencies, and also its radiation efficiency is greater than 82% across the entire radiating band. The designed antenna has a small size of 12 × 18 mm2. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure for circular cylindrical microwave imaging system.
Downloads
References
E. C. Fear, S. C. Hagness, P. M. Meaney, M. Okonieweski, and M. A. Stuchluy, “Enhancing breast tumor detecting with near-field imaging,” IEEE Microwave Magazine, pp. 48-56, March 2002.
K. D. Paulsen and P. M. Meaney, “Non-active antenna compensation for fixed-array microwave imaging - Part I: model development,” IEEE Transaction on Medical Imaging, vol. 18, pp. 496- 507, June 1999.
E. J. Bond, X. Li, S. C. Hagness, and B. D. Van Veen, “Microwave imaging via space-time beam forming for early detection of breast cancer,” IEEE Trans. Antennas Propag., vol. 51, no. 9, pp. 1690- 1705, Aug. 2003.
N. Ojaroudi, M. Ojaroudi, and N. Ghadimi, “UWB omni-directional square monopole antenna for use in circular cylindrical microwave imaging systems,” IEEE Antennas Wireless Propag. Lett., vol. 11, pp. 1350-1353, 2012.
K. Halili, M. Ojaroudi, and N. Ojaroudi “Ultra wideband monopole antenna for use in a circular cylindrical microwave imaging system,” Microwave Opt. Technol. Lett., vol. 54, pp. 2202- 2205, 2012.
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, Jan. 2012.
M. Mighani, M. Akbari, and N. Felegari, “A CPW dual band notched UWB antenna,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, no. 4, pp. 352-359, April 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, Oct. 2011.
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, Feb. 2009.
M. Mehranpour, J. Nourinia, C. Ghobadi, and M. Ojaroudi, “Dual band-notched square monopole antenna for ultrawideband applications,” IEEE Antennas Wireless and Propag. Lett., vol. 11, pp. 172-175, 2012.
N. Ojaroudi, M. Ojaroudi, and S. Amiri, “Enhanced bandwidth of small square monopole antenna by using inverted U-shaped slot and conductor-backed plane,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, no. 8, pp. 685-690, August 2012.
J. C. Wynn and K. L. Zonge, “Electromagnetic coupling, its intrinsic value, its removal and cultural coupling problem,” Geophysics, vol. 40, pp. 831-850, 1975.
Ansoft High Frequency Structure Simulation (HFSS), ver. 13, Ansoft Corporation, 2010.
B. H. Siahkal-Mahalle, N. Ojaroudi, and M. Ojaroudi, “A new design of small square monopole antenna with enhanced bandwidth by using crossshaped slot and conductor-backed plane,” Microwave Opt. Technol. Lett., vol. 54, pp. 2656- 2659, 2012.
H. D. Chen, H. M. Chen, and W. S. Chen, “Planar CPW-fed sleeve monopole antenna for Ultrawideband operation,” IET Microwave, Antennas Propag. vol. 152, no. 6, pp. 491-494, Dec. 2005.
