Dual-band balanced handset antenna for WLAN application

A built-in planar metal plate antenna for mobile handsets with balanced operation is presented. The antenna was designed by folding a thin strip planar dipole with extra arm on each monopole. The antenna features balanced operation, is to reduce the current flow on the conducting surface of the handset body. The antenna design model intends to cover 2.4-GHz and the 5.2-GHz WLAN applications. For practical validation, the antenna prototype was fabricated. The measured return loss, radiation pattern and power gain of the prototype antenna are presented to verify the antenna performance. The measured results are found in good agreement with the calculated results.