Antenna design for a smartphone with a full metal casing and a narrow frame

Antenna design for a smartphone with a full metal casing and a narrow frame

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
IET Microwaves, Antennas & Propagation — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

A mobile-phone antenna with a wideband feed structure (WBFS) and an auxiliary structure for a full metal casing and a very narrow frame are proposed. The most highlight of this proposed antenna is that it provides a method to overcome the difficulties of designing a high-performance antenna in a full metal casing with a very narrow frame. The WBFS is designed to have a broadband performance. The total size of the antenna is 6 × 48 mm2, and a 6 mm long ground clearance is set on the bottom edge of the system circuit board. The experimental results reveal that a good impendence matching is obtained across the frequency bands of 824–960 and 1710–2690 MHz, and the total efficiency is more than 40%. The antenna maintains a good performance when user's hand(s) is (are) holding it; meanwhile, keeps the specific absorption rate (SAR) under the IEEE Std. C95.1 compliant SAR. In addition, the performance of the proposed antenna in a multi-antenna system is examined. The result shows that the proposed antenna is a good candidate for a multiple-input–multiple-output system.


    1. 1)
      • 1. Anguera, J., Andújar, A., Huynh, M.C., et al: ‘Advances in antenna technology for wireless handheld devices’, Int. J. Antennas Propag., 2013, 2013, pp. 388391.
    2. 2)
      • 2. Guo, Q., Mittra, R., Lei, F., et al: ‘Interaction between internal antenna and external antenna of mobile phone and hand effect’, IEEE Trans. Antennas Propag., 2013, 61, (2), pp. 862870.
    3. 3)
      • 3. Ban, Y.L., Qiang, Y.F., Chen, Z., et al: ‘A dual-loop antenna design for hepta-band WWAN/LTE metal rimmed smartphone applications’, IEEE Trans. Antennas Propag., 2015, 63, (1), pp. 4858.
    4. 4)
      • 4. Ban, Y.L., Qiang, Y.F., Wu, G., et al: ‘Reconfigurable narrow-frame antenna for LTE/WWAN metal-rimmed smartphone applications’, Microw. Opt. Technol. Lett., 2016, 10, (10), pp. 10921100.
    5. 5)
      • 5. Ishimiya, K., Chiu, C.Y., Takada, J.I.: ‘Multiband loop handset antenna with less ground clearance’, IEEE Antennas Wirel. Propag. Lett., 2013, 12, pp. 14441447.
    6. 6)
      • 6. Wong, K.L., Wu, Y.: ‘Small-size dual-wideband IFA frame antenna closely integrated with metal casing of the LTE smartphone and having decreased user's hand effects’, Microw. Opt. Technol. Lett., 2016, 58, (12), pp. 28532858.
    7. 7)
      • 7. Chi, Y.W., Wong, K.L.: ‘Very-small-size folded loop antenna with a band-stop matching circuit for WWAN operation in the mobile phone’, Microw. Opt. Technol. Lett., 2009, 51, (3), pp. 808814.
    8. 8)
      • 8. Wong, K.L., Wu, T.J.: ‘Small-size LTE/WWAN coupled-fed loop antenna with band-stop matching circuit for tablet computer’, Microw. Opt. Technol. Lett., 2012, 54, (5), pp. 11891193.
    9. 9)
      • 9. Wong, K.L., Chen, M.T.: ‘Small-Size LTE/WWAN printed loop antenna with an inductively coupled branch strip for bandwidth enhancement in the tablet computer’, IEEE Trans. Antennas Propag., 2013, 61, (12), pp. 61446151.
    10. 10)
      • 10. Wong, K.L., Chen, M.T.: ‘Very-low-profile dual-wideband loop antenna for LTE tablet computer’, Microw. Opt. Technol. Lett., 2015, 57, (1), pp. 141146.
    11. 11)
      • 11. Wong, K.L., Chang, H.J.: ‘On-frame gap-coupled half-loop antenna with a narrow ground clearance for the LTE smartphone’, Microw. Opt. Technol. Lett., 2016, 58, (10), pp. 23442351.
    12. 12)
      • 12. Chu, F.H., Kao, Y.C., Wong, K.L.: ‘Penta-band WWAN handset antenna embedded in a small notch in the system ground plane’. Antennas and Propagation Society Int. Symp., 2012, pp. 12.
    13. 13)
      • 13. Wang, H., Zheng, M.: ‘Triple-band wireless local area network monopole antenna’, IET Microw. Antennas Propaga., 2008, 2, (4), pp. 367372.
    14. 14)
      • 14. Wang, H.: ‘Dual-resonance monopole antenna with tuning stubs’, IEE Proc., Microw. Antennas Propag., 2006, 153, (4), pp. 395399.
    15. 15)
      • 15. Gabriel, C.: ‘Tissue equivalent material for hand phantoms’, Phys. Med. Biol., 2007, 52, (14), pp. 42054210.
    16. 16)
      • 16. Engineers, E.E., Board, I.S.: ‘IEEE standard for safety levels with respect to human exposure to radio frequency electromagnetic fields, 3 kHz to 300 GHz’. IEEE Std. C. IEEE, 2002, p. 1.
    17. 17)
      • 17. Janaswamy, R.: ‘Effects of mutual coupling on the capacity of fixed length linear arrays’, IEEE Antennas Wirel. Propag. Lett., 2002, 1, (1), pp. 157160.
    18. 18)
      • 18. Hallbjörner, P.: ‘The significance of radiation efficiencies when using S-parameters to calculate the received signal correlation from two antennas’, IEEE Antennas Wirel. Propag. Lett., 2005, 4, (1), pp. 9799.
    19. 19)
      • 19. Zhao, X., Kwon, K., Choi, J.: ‘MIMO antenna using resonance of ground planes for 4G mobile application’, J. Electromagn. Eng. Sci., 2013, 13, (1), pp. 184185.
    20. 20)
      • 20. Votis, C., Tatsis, G., Kostarakis, P.: ‘Envelope correlation parameter measurements in a MIMO antenna array configuration’, Int. J. Commun. Netw. Syst. Sci., 2010, 3, (4), pp. 350354.

Related content

This is a required field
Please enter a valid email address