Internal Compact Dual-Band Printed Loop Antenna for Mobile Phone Application

A novel dual-band printed loop antenna very promising for application in mobile phones as an internal antenna is presented. The antenna comprises an outer loop strip and an inner inverted-L strip connected to and enclosed by the outer loop strip. The antenna occupies a compact area of 15 times 50 mm2 only, yet generating three resonant modes to form two wide bands at about 900 and 1800 MHz for the Global System for Mobile Communication/Digital Communication System operation. Detailed design considerations of the three excited modes are described in the paper. When a shielding metal case is placed close to the antenna, small effects on the antenna's impedance matching are seen, allowing compact integration of the antenna with nearby conducting elements or electronic components. The antenna is also found to result in small excited surface current distributions on the system ground plane of the mobile phone. This behavior is expected to lead to reduced user's hand effects on the radiation efficiency of the antenna

[1]  Kin-Lu Wong,et al.  WLAN chip antenna mountable above the system ground plane of a mobile device , 2005, IEEE Transactions on Antennas and Propagation.

[2]  Kin-Lu Wong,et al.  Planar Inverted-F Antenna with A Hollow Shorting Cylinder for Mobile Phone with an Embedded Camera , 2004 .

[3]  Kevin Barraclough,et al.  I and i , 2001, BMJ : British Medical Journal.

[4]  Kin-Lu Wong,et al.  User's hand effects on EMC internal GSM/DCS dual‐band mobile phone antenna , 2006 .

[5]  Kin-Lu Wong,et al.  On the impedance bandwidth of a planar inverted-F antenna for mobile handsets , 2002 .

[6]  P. Vainikainen,et al.  Resonator-based analysis of the combination of mobile handset antenna and chassis , 2002 .

[7]  Kin-Lu Wong,et al.  Surface-mountable EMC monopole chip antenna for WLAN operation , 2006 .

[8]  Kin-Lu Wong,et al.  Wideband monopole antenna integrated within the front-end module package , 2006 .

[9]  Kin-Lu Wong,et al.  Internal shorted patch antenna for a UMTS folder-type mobile phone , 2005 .

[10]  Kin-Lu Wong,et al.  Planar Antennas for Wireless Communications , 2003 .

[11]  K. Fujimoto,et al.  Design concept of antennas for small mobile terminals and the future perspective , 2002 .

[12]  Kin-Lu Wong,et al.  EMC internal patch antenna for UMTS operation in a mobile device , 2005 .

[13]  R. W. Lau,et al.  The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues. , 1996, Physics in medicine and biology.