Wideband balanced folded dipole antenna for mobile handsets

Abstract

A wideband balanced antenna for mobile handsets, covering three bands (GSM 1800, GSM 1900 and UMTS), is investigated. The antenna is a slot planar dipole with its arms folded and fed by a balanced voltage source. A wide bandwidth planar balun was adopted and modified to feed the antenna from an unbalanced source. For validation, a prototype of the antenna was fabricated and tested. The calculated and measured results in terms of return loss show good agreement and the results also show good wideband characteristics. (5 pages)