Patent ID: 7652637
Filing Date: 2010-01-26
Classification: H01Q

Abstract:
1. An antenna connected to a circuit portion and configured to effect transmission and reception of information by radio, communication, said antenna comprising: a driven meander line portion comprising a plurality of driven meander line sections, wherein the driven meander line portion has a feed section connected to said circuit portion and which is a line conductor formed in a meandering pattern; and a parasitic meander line portion comprising a plurality of parasitic meander line sections, wherein the parasitic meander line portion does not have a feed section connected to said circuit portion and which is a line conductor formed in a meandering pattern, said parasitic meander line portion being positioned relative to said driven meander line portion, so as to influence an input impedance of said driven meander line portion, said parasitic meander line portion being electrically insulated from said driven meander line portion, each of said driven and parasitic meandering portions including a plurality of transverse conductive sections and a plurality of longitudinal conductive sections which are alternately arranged in a longitudinal direction of the antenna, and are alternately connected to each other so as to form the meandering pattern, said driven and parasitic meander line portions being positioned relative to each other so as to define a plurality of first portions and a plurality of second portions which are arranged at a predetermined pitch in a predetermined positional relationship with each other in said longitudinal direction, such that a center-to-center distance between the adjacent two transverse conductive sections of the parasitic meander line portion in each of said first portions minus width dimensions of said adjacent two transverse conductive sections is larger than a sum of a center-to-center distance between the adjacent two transverse conductive sections of the driven meander line portion and the width dimensions of the adjacent two transverse conductive sections of the driven meander line portion, and such that a sum of said center-to-center distance between the adjacent two transverse conductive sections of the parasitic meander line portion in each of said second portions and the width dimensions of the adjacent two transverse conductive sections of said parasitic meander line portion is smaller than said center-to-center distance between the adjacent two transverse conductive sections of the driven meander line portion minus the width dimensions of the adjacent two transverse conductive sections of the driven meander line portion, and said driven and parasitic meander line portions having at least one part in each of which the adjacent two transverse conductive sections of the parasitic meander line portion are interposed between the corresponding adjacent two transverse conductive sections of the driven meander line portion in said longitudinal direction.