Patent ID: 8013799

Claim:
A dual-band monopole antenna, comprising: a transmission line load comprising: a core transmission line having an extension section connection terminal and a signal feeding terminal, and an outer circumferential conductor circumferentially surrounding and spaced from the core transmission line by a given distance, the outer circumferential conductor having an open terminal and a short-circuit terminal, an antenna signal being fed from the signal feeding terminal of the core transmission line to the transmission line load through the short-circuit terminal of the outer circumferential conductor; and an antenna extension section having a top terminal and a transmission line connection terminal, the transmission line connection terminal being connected to the extension section connection terminal of the core transmission line, wherein a distance from the signal feeding terminal of the core transmission line to the open terminal of the outer circumferential conductor defines a short-circuit transmission line length, the short-circuit transmission line length being set to correspond to an equivalent quarter wavelength of a predetermined second resonant frequency, an overall length of the dual-band monopole antenna being defined by a sum of a length of the antenna extension section and the short-circuit transmission line length and being set corresponding to an equivalent quarter wavelength of a predetermined first resonant frequency.