Patent ID: 6232930
Filing Date: 2001-05-15
Classification: H01Q

Abstract:
A dual band antenna comprising:a first member defining a coil having a length between first and second ends and a plurality of windings including first and second selected windings between the first and second ends, said first end being a feed point; anda second member defining a reactive element, said second member including a conductive element disposed on a first surface of a dielectric film, said conductive element having a selected area and shape and extending to first and second ends associated with said first and second selected windings, said conductive element having a narrowed portion between its said first and second ends;said second member being at least partially wrapped around said coil with a second surface of said film adjacent said windings and extending therealong at least between said first and second selected windings such that said first and second ends of said conductive element are adjacent said first and second selected windings with said dielectric layer between said conductive element and said windings;whereby, at relatively high frequencies, said first and second ends of said second member capacitively couple with said first and second selected windings, but said narrowed portion does not capacitively couple with any of said windings, whereby said second member forms a short circuit between said first and second selected windings to effectively shorten the length of the coil.