A Wideband Mobile Terminal Antenna Using the Resonance of a Slide Structure

In this paper, a novel method of obtaining a wideband antenna for a slide mobile terminal by optimizing the conditions of the terminal case is proposed, and this method uses the resonance of a slide structure. The slide structure has two ground planes which overlap each other, and the upper and lower ground planes are connected by FPC (Flexible Printed Circuit). When a monopole-type antenna is used, the antenna can be treated as a series resonator. In addition, the slide structure can be treated as a shunt resonator. Therefore, a double resonance appears in the input impedance of the antenna, and the wideband characteristic is attained. The resonance frequency of the slide structure can be adjusted by changing the length of FPC and the capacitance between the upper and lower ground planes. This is verified by FDTD simulations.