Patent ID: 6275198
Filing Date: 2001-08-14
Classification: H01Q

Abstract:
A wide band dual mode antenna, comprising:an electrically conductive monopole portion;an electrically insulating core having a dielectric constant and adjacent to the monopole portion; andan electrically conductive wire adjacent to the core and having a total length associated with a predetermined resonant frequency, the wire comprising first and second ends, wherein the first end is electrically coupled to the monopole portion and the second end is electrically floating,the total length of the wire comprising first, second and third segments, the first segment having a first length extending from the first end along an axis of the core and the second segment having a second length extending along the axis of the core, the first and second segments being separated by a first distance such that at least the first and second lengths and the first distance are associated with creating a current null point between the first and seconds ends at a second resonant frequency, and the third segment comprising a helical portion adapted to self-couple the wire through the dielectric constant of the core to electrically load the monopole portion.