volume | PIER Journals

Abstract

This paper investigates broadband planar antennas that consist of a wide rectangular slot with various tuning stubs. The antennas are fed by coplanar waveguides. Wide slots containing a single tuning stub, V-shaped stubs, as well as inverted F-shaped stubs are investigated. Despite using a high dielectric constant substrate, the proposed antennas exhibit very broad bandwidth. They also have broadside bidirectional radiation. The radiation pattern stability with frequency for the various configurations is presented. One of the proposed configurations, the inverted F stub in a wide rectangular slot, produced very stable radiation patterns over its entire impedance bandwidth of about 40%. Also, an impedance bandwidth of 44% was obtained for the V-shaped stub in a rectangular slot. Simulations as well as experimental results are presented.

1. Menzel, W. and W. Grabherr, "A microstrip patch antenna with coplanar line feed," IEEE Microwave and Guided Wave Letters, Vol. 1, 340-342, 1991.
doi:10.1109/75.93905 Google Scholar

2. Smith, R. and J. T. Williams, "Coplanar waveguide feed for microstrip patch antennas," Electronics Letters, Vol. 28, 2272-2274, 1992. Google Scholar

3. Deng, S. M., M. D. Wu, and P. Hsu, "Analysis of coplanar waveguide-fed microstrip antennas," IEEE Trans. Antennas and Propagation, Vol. 43, No. 7, 734-737, 1995.
doi:10.1109/8.391149 Google Scholar

4. Saed, M., "Reconfigurable broadband microstrip antenna fed by a coplanar waveguide," Progress In Electromagnetics Research, Vol. 55, 227-239, 2005.
doi:10.2528/PIER05031601 Google Scholar

5. Giauffret, L., J. Laheurte, and A. Papiernik, "Study of various shapes of the coupling slot in cpw-fed microstrip antennas," IEEE Trans. Antennas and Propagation, Vol. 45, No. 4, 642-647, 1997.
doi:10.1109/8.564090 Google Scholar

6. Kormanyos, B. K., W. Harokoupos, L. P. katehi, and G. M. Rebeiz, "CPW-fed active slot antenna," IEEE Trans. Microwave Theory and Techniques, Vol. 42, No. 4, 541-545, 1994.
doi:10.1109/22.285057 Google Scholar

7. Rowell, C. R. and R. D. Murch, "A capacitively loaded PIFA for compact mobile telephone handestes," IEEE Trans. Antennas and Propagation, Vol. 45, 837-842, 1997.
doi:10.1109/8.575634 Google Scholar

8. Wong, K. L., Planar Antennas for Wireless Communications, Wiley.

9. Rowell, C. R. and R. D. Murch, "A capacitively loaded PIFA for compact mobile telephone handsets," IEEE Trans. Antennas and Propagation, Vol. 45, No. 5, 837-842, 1997.
doi:10.1109/8.575634 Google Scholar

10. Chair, R., A. A. Kishk, K.-F. Lee, C. E. Smith, and D. Kajfez, "Microstrip line and CPW fed ultra wideband slot antennas with u-shaped tuning stub and reflector," Progress In Electromagnetics Research, Vol. 56, 163-182, 2006.
doi:10.2528/PIER05060701 Google Scholar

11. Eldek, A. A., A. Z. Elsherbeni, and C. E. Smith, "Rectangular slot antenna with patch stub for ultra wideband applications and phased array systems," Progress In Electromagnetics Research, Vol. 53, 227-237, 2005.
doi:10.2528/PIER04092701 Google Scholar

12. Eldek, A. A., A. Z. Elsherbeni, and C. E. Smith, "Dualwideband square slot antenna with a u-shaped printed tuning stub for personal wireless communication systems," Progress In Electromagnetics Research, Vol. 53, 319-333, 2005.
doi:10.2528/PIER04103001 Google Scholar

Dr. Mohammad Saed