volume | PIER Journals

Abstract

A compact and simple interdigital capacitor inverted-F antenna (IFA) operated at its quarter-wavelength (λ/4) mode as the fundamental resonant mode for achieving multiband operation in the mobile phone is designed. The proposed antenna consists of a monopole antenna and an IFA. The proposed interdigital capacitor IFA has a simple structure of comprising two meandered radiating strips of length about λ/4 and is fed using an interdigital capacitor coupling feed. The two meandered radiating strips also generate two λ/4 resonance modes at about 900 MHz and 2100 MHz to cover the GSM850/900/1800/1900/DCS/PCS/UMTS bands and the 2.4 GHz WLAN (IEEE 802.11b) band operations. Further, the proposed antenna has a simple planar structure and occupies only a small area of 10×40 mm² on the system circuit board of the mobile phone. This proposed antenna with multiband, broadband matched impedance, stable radiation patterns, constant antenna gains, good radiation efficiency and compact size can be suitable for mobile phone applications.

1. Alkanhal, M. A. S., "Composite compact triple-band microstrip antennas," Progress In Electromagnetics Research, Vol. 93, 221-236, 2009.
doi:10.2528/PIER09050407

2. Chiu, C. W., C. H. Chang, and Y. J. Chi, "Multiband folded loop antenna for smart phones," Progress In Electromagnetics Research, Vol. 102, 213-226, 2010.

3. Chi, Y. W. and K. L. Wong, "Internal compact dual-band printed loop antenna for mobile phone application," IEEE Trans. Antennas Propag., Vol. 55, 1457-1462, 2007.
doi:10.1109/TAP.2007.895641

4. Zhou, D., R. A. Abd-Alhameed, C. H. See, and P. S. Excell, "Wideband balanced folded dipole antenna with a dual-arm monopole structure for mobile handsets," IET Microw. Antennas Propag., Vol. 4, No. 2, 240-246, 2010.
doi:10.1049/iet-map.2008.0412

5. Tang, I. T., D. B. Lin, and T. H. Lu, "Apply the slow wave effect to design the compact antenna," Microwave Journal, Vol. 51, No. 6, 96-105, 2008.

6. See, C. H., R. A. Abd-Alhameed, P. S. Excell, N. J. McEwan, and J. G. Gardiner, "Internal triple-band folded planar antenna design for third generation mobile handsets," IET Microw. Antennas Propag., Vol. 2, No. 7, 718-724, 2008.
doi:10.1049/iet-map:20070356

7. Shin, Y. S., B. N. Kim, W. I. Kwak, and S. O. Park, "GSM/DCS/IMT-2000 triple-band built-in antenna for wireless terminals," IEEE Antennas Wireless Propag. Lett., Vol. 3, 104-107, 2005.

8. Hsieh, H. W., Y. C. Lee, K. K. Tiong, and J. S. Sun, "Design of a multiband antenna for mobile handset operations," IEEE Antennas Wireless Propag. Lett., Vol. 8, 200-203, 2009.
doi:10.1109/LAWP.2008.2011655

9. Chen, C. C., C. Y. D. Sim, and F. S. Chen, "A novel compact quad-band narrow strip-loaded printed monopole antenna," IEEE Antennas Wireless Propag. Lett., Vol. 8, 974-976, 2009.
doi:10.1109/LAWP.2009.2030138

10. Li, Z. and Y. Rahmat-Samii, "Optimization of PIFA-IFA combination in handset antenna designs," IEEE Trans. Antennas Propag., Vol. 53, 1770-17708, 2005.
doi:10.1109/TAP.2005.850761

11. Jiang, B. T. and J. F. Mao, "Design of a PIFA-IFA-monopole in dual-SIM mobile phone for GSM/DCS/Bluetooth operations," 2008 ICMMT Microwave and Millimeter Wave Technology, Vol. 3, 1050-1053, 2008.
doi:10.1109/ICMMT.2008.4540602

12. Cabedo, A., J. Anguera, C. Picher, M. Ribo, and C. Puente, "Multi-band handset antenna combining PIFA, slots, and ground plane modes," IEEE Transactions on Antennas and Propagation, Vol. 57, No. 9, 2526-2533, 2009.
doi:10.1109/TAP.2009.2027039

13. Azad, M. Z. and M. Ali, "A miniaturized Hilbert PIFA for dual-band mobile wireless applications," IEEE Antennas Wireless Propag. Lett., Vol. 4, 59-62, 2005.
doi:10.1109/LAWP.2005.844128

14. Lin, D. B., I T. Tang, and M. Z. Hong, "A compact quad-band PIFA by tuning the defected ground structure for mobile phones," Progress In Electromagnetics Research B, Vol. 24, 173-189, 2010.
doi:10.2528/PIERB10070608

15. Wu, C. H. and K. L. Wong, "Ultrawideband PIFA with a capacitive feed for penta-band folder-type mobile phone antenna," IEEE Trans. Antennas Propag., Vol. 57, No. 8, 2461-2464, 2009.
doi:10.1109/TAP.2009.2024571

16. Tang, I T., D. B. Lin, W. L. Chen, and J. H. Horng, "Miniaturized hexaband meandered PIFA antenna using three meandered-shaped slits," Microwave Opl. Tech. Lett., Vol. 50, No. 4, 1022-1025, 2008.
doi:10.1002/mop.23292

17. Wong, K. L. and C. H. Huang, "Printed PIFA with a coplanar coupling feed for penta-band operation in the mobile phone," Microwave Opl. Tech. Lett., Vol. 50, No. 12, 3181-3186, 2008.
doi:10.1002/mop.23906

18. Wong, K. L. and S. J. Liao, "Uniplanar coupled-fed printed PIFA for WWAN operation in the laptop computer," Microwave Opl. Tech. Lett., Vol. 51, No. 2, 549-554, 2009.
doi:10.1002/mop.24084

Prof. Ding-Bing Lin

Dr. I-Tseng Tang

Dr. En-Tsao Chang