Abstract: The present invention relates to a layer-built antenna which adopts a substrate made of a composite of magnetic material and polymer resin or a high magnetic permeability layer installed adjacent to a conductive antenna pattern in order to shorten the resonant length, by which the antenna can be reduced in size. The layer-built antenna has antenna structures each including a magnetic dielectric substrate having predetermined relative magnetic permeability and relative dielectric constant and a conductive antenna pattern formed on the magnetic dielectric substrate. A feeding part is formed on the magnetic dielectric substrates of the antenna structures and electrically connected with the conductive antenna patterns of the antenna structures. The antenna structures are stacked one on another, and the conductive antenna patterns on upper and lower ones of the stacked antenna structures are electrically connected together.

Abstract: The invention relates to a helical antenna installed inside a mobile communication terminal, capable of processing low-bandwidth signals. In the helical antenna, a substrate is made of magnetic dielectric material, a plurality of lower electrodes are disposed on the underside of the substrate, and a plurality of upper electrodes are disposed on the top of the substrate. The upper electrodes are inclined with respect to the lower electrodes, respectively, at a predetermined angle. A plurality of side electrodes electrically connect the lower electrodes with the upper electrodes, respectively. At least a part of magnetic vector moment, which is formed around each of the lower electrodes by current flowing along the each lower electrode, is directed in parallel with current flowing along each of the upper electrodes corresponding to the each lower electrode.