A triple-band planar printed L-type antenna with an open-loop resonator for handset application

A planar printed multiband handset antenna by using an L-shape radiating element and an open-loop resonator to achieve multi-operation bands is presented. The antenna can cover the operation of GSM900/DCS1800 and WLAN2450 or Bluetooth system. The antenna is fabricated with a FR-4 substrate. The areas occupied by the antenna radiators and ground plane are 15×45 mm
²
and 85×45 mm
²
, respectively. The area of antenna substrate has 100×45 mm
²
which is a typical size of mobile handsets. The HFSS FEM-based 3-D full-wave EM solver is used for the design simulation. For the triple-band antenna, except for the GSM900 system, the measured antenna input VSWR is less than 3.5 in the designed frequency bands. The measured maximum antenna gains are about 0.8, 2.4, and 2.2 dBi at 920 MHz, 1795, and 2450 MHz, respectively. The antenna has the advantages of low-cost, easy-fabrication, and an integration with RF front-end circuits.