A folded loop antenna system for handsets

A unique folded loop antenna for handsets has been analyzed. The folded loop antenna is constituted by the concept of integration, by which the mode increase and small sizing are achieved. It has been shown that the folded loop antenna shaped like a half-wave folded dipole has similar structure as the balanced system and so almost no unbalanced currents flow on the ground plane as well. Thus with this structure, mitigation of the antenna performance degradation due to the body effect can be made possible. Another uniqueness of this antenna lies in the use of a two-wire transmission line for the antenna element. The antenna impedance can be adjusted flexibly by changing the parameters of the transmission line. By this means, matching can be made easy without using a balun.