Antenna system including a plurality of meander conductors for a portable radio apparatus

Claim 1

An antenna system of small size that can be mass-produced and that has a wide frequency band for use with a portable receiver, comprising: a plurality of meander conductors printed on at least one film of a dielectric material and satisfying respectively different resonance conditions in a frequency band used by the receiver; at least one solid cylinder of a dielectric material for winding said dielectric film therearound; and a hollow cylinder of a dielectric material for covering said dielectric film wound around said dielectric solid cylinder, wherein said individual meander conductors, which are printed on said dielectric film, do not make direct electrical contact with each other, wherein said plural meander conductors include a first meander conductor, which is used an antenna, connected to the feeder and second and third meander Conductors, which are used as resonators, spaced apart by predetermined distances from said first meander conductor, respectively, for producing multiple resonance by electromagnetic coupling with said first meander conductor, thereby widening the frequency band, wherein said first and second meander conductors are printed on a first dielectric film, while said third meander conductor is printed on a second dielectric film, wherein said dielectric solid cylinder includes an inner dielectric solid cylinder disposed at a central area of the antenna system and an inner dielectric hollow cylinder having a predetermined thickness and covering said inner dielectric solid cylinder, and wherein said second dielectric film is disposed between said inner dielectric solid cylinder and said inner dielectric hollow cylinder, while said first dielectric film is disposed to surround the outer periphery of said inner dielectric hollow cylinder.