Patent ID: 6870506
Filing Date: 2005-03-22
Classification: H01Q

Abstract:
1. A multi-frequency antenna with a single layer and a single feeding point, said antenna comprises a central microstrip with a set length and a set width, a bottom end of said central microstrip is used as the feeding point, a top end thereof is extended bilaterally to form respectively a first band section and a second band section, said first band section is provided on an end thereof with a first open circuit point, and said second band section is provided on an end thereof with a second open circuit point, a grounding line of a set length and a set width is provided at a position a distance below said feeding point on said bottom end of said central microstrip; the lengths from said feeding point to the first open circuit point on said end of said first band section and to the second open circuit point on said end of said second band section are both ¼ λ of one of said band sections to be used, wherein said feeding point and said grounding line are spaced apart a predetermined distance to form an edge perturbation effect for adjusting impedance matching and increasing a bandwidth.