Patent ID: 8410989

Claim:
An antenna for receiving electromagnetic waves in a desired frequency band, comprising: a radiating conductor and a ground conductor which resonate at a resonance point frequency; a feeder part configured to feed said radiating conductor with a signal; wavelength-shortening means in which a magnetic body having both a dielectric property and a magnetic property is secured directly to said radiating conductor and which shifts said resonance point frequency lower by a wavelength-shortening effect obtained based on said dielectric property and said magnetic property; and magnetic field applying means configured to apply a magnetic field to said magnetic body so as to reduce a magnetic loss due to said magnetic body, and wherein the wavelength-shortening means is comprised of first and second bodies of magnetic material having both a dielectric property and a magnetic property which are located at opposite sides of the radiating conductor which is a planar structure such that they entirely cover opposite side surfaces of the radiating conductor and further wherein the magnetic field applying means is a permanent magnet structure that is secured to one of the first and second bodies of magnetic material exclusively in a region of the feeder part.