Folded loop antenna for mobile communication systems

There has been tremendous world-wide activity aimed at developing mobile communication systems. The growing market demand generates interest in the performance of compact antenna structures mounted on portable devices. Some of the desired features for these antennas include low profile geometry, ease of construction, low cost, attractive appearance, and omnidirectional radiation pattern on the azimuthal plane. This paper presents the radiation characteristics of a new antenna, the folded loop mounted vertically on a conducting box with and without a dielectric coating, to simulate a handheld portable telephone. The radiation patterns and input impedance are determined by computer simulations based upon the FDTD and verified with measurements and computations performed using NEC.