volume | PIER Journals

Abstract

A conformal wideband antenna is investigated and compared with its planar counterpart. First, a planar U-slot patch with about 43% fractional impedance bandwidth is designed. Then, it is mounted on a conformal cylindrical structure. It is observed that the fractional impedance bandwidth of the resulting conformal antenna increases to 50%, when it is bent along the H-plane. It is also found that the cross polarization discrimination of the antenna is improved. The effects of the arc angle and radius of the cylinder on the impedance bandwidth and radiation characteristics of the antenna are extensively studied. The conformal antenna was fabricated on a thin film of Kapton and tested. The measured and simulated results closely resembled each other.

1. Balanis, C. A., Antenna Theory: Analysis and Design, 4th Ed., John Wiley, 2016.

2. Huynh, T. and K.-F. Lee, "Single-layer single-patch wideband microstrip antenna," Electron. Lett., Vol. 31, No. 16, 1310-1312, Aug. 1995.
doi:10.1049/el:19950950 Google Scholar

3. Weigand, S., G. H. Huff, K. H. Pan, and J. T. Bernhard, "Analysis and design of broad-band single-layer rectangular U-slot microstrip patch antennas," IEEE Trans. Antennas Propag., Vol. 51, No. 3, 457-468, Mar. 2003.
doi:10.1109/TAP.2003.809836 Google Scholar

4. Tong, K.-F., K.-M. Luk, K.-F. Lee, and R. Q. Lee, "A broad-band U-slot rectangular patch antenna on a microwave substrate," IEEE Trans. Antennas Propag., Vol. 48, No. 6, 954-960, Jun. 2000.
doi:10.1109/8.865229 Google Scholar

5. Salonen, P. and Y. Rahmat-Samii, "Textile antennas: Effects of antenna bending on input matching and impedance bandwidth," IEEE Aerosp. Electron. Syst. Mag., 10-14, Mar. 2007.
doi:10.1109/MAES.2007.340501 Google Scholar

6. Song, L. and Y. Rahmat-Samii, "A systematic investigation of rectangular patch antenna bending effects for wearable applications," IEEE Trans. Antennas Propag., Vol. 66, No. 5, 2219-2228, May 2018.
doi:10.1109/TAP.2018.2809469 Google Scholar

7. Liu, F.-X., T. Kaufmann, Z. Xu, and C. Fumeaux, "Wearable applications of quarter-wave patch and half-mode cavity antennas," IEEE Antennas Wireless Propag. Lett., Vol. 14, 1478-1481, 2015.
doi:10.1109/LAWP.2014.2383399 Google Scholar

8. Ashyap, A., Z. Abidin, S. Dahlan, H. Majid, M. Kamarudin, G. Oguntala, R. A. Abd-Alhameed, and J. Noris, "Inverted E-shaped wearable textile antenna for medical applications," IEEE Access, Vol. 6, 35214-35222, Jun. 2018.
doi:10.1109/ACCESS.2018.2847280 Google Scholar

9. Macon, C. A., K. D. Trott, and L. C. Kempel, "A practical approach to modeling doubly curved conformal microstrip antennas," Progress In Electromagnetics Research, Vol. 40, 295-314, 2003.
doi:10.2528/PIER02122903 Google Scholar

10. Krowne, C. M., "Cylindrical-rectangular microstrip antenna," IEEE Trans. Antennas Propag., Vol. 31, No. 1, 194-199, Jan. 1983.
doi:10.1109/TAP.1983.1143000 Google Scholar

11. Luk, K., K.-F. Lee, and J. S. Dahele, "Analysis of the cylindrical rectangular patch antenna," IEEE Trans. Antennas Propag., Vol. 37, No. 2, 143-147, Feb. 1989.
doi:10.1109/8.18699 Google Scholar

12. "ANSYS high frequency electromagnetic field simulator HFSS (version 18.1),", Canonsburg, PA. Google Scholar

13. Ludwig, A., "The definition of cross polarization," IEEE Trans. Antennas Propag., Vol. 21, No. 1, 116-119, Jan. 1973.
doi:10.1109/TAP.1973.1140406 Google Scholar

Dr. Tanzeela Mitha

Professor Maria Pour