US 6,606,062 B2 · Planar antenna and a dual band transmission device including it

Abstract

A dual band transmission device includes a microstrip antenna. Its patch is provided with a short circuit for setting up quarter-wave resonant modes. A slot penetrates into the patch from its periphery, in the vicinity of the short circuit, and separates a first region from a second region, which second region nevertheless remains connected to the first region by a passage. Two resonant modes are obtained, one in the first region and the other in the first region, the passage and the second region. They can be excited from a common connecting line. According to the invention, the center frequencies and the pass-bands of the two modes are adjusted by means of a reactive component such as a capacitor which couples the first region to the second region in the vicinity of the origin of the slot. The invention applies in particular to producing a dual mode mobile telephone system conforming to the GSM and DCS standards.

Claims19

Dependent claims

A planar antenna including superposed layers respectively constituting:

a conductive ground,
a dielectric substrate formed on said ground, and
a patch formed on said substrate,
wherein said patch has an area and a periphery and includes a separator slot having an origin on said periphery and a closed end in said area, said closed end leaves a passage between itself and said periphery, said separator slot penetrates into said area from said origin and cooperates with said periphery to delimit in said area a first region and a second region that are conductive and electrically separated from each other by said separator slot and connected by said passage, said first region and said second region have respective areas, and said antenna further includes a reactive component forming a coupling between said two conductive regions, and overlaps said conductive ground.

1 more element

A dual band transmitter device including:

a signal processor unit adapted to be tuned to a frequency in two working bands about two respective predetermined center frequencies for transmitting and/or receiving an electrical signal in each of said two working bands,
a microstrip antenna including a patch and a ground, and
an antenna connection arrangement including electrical conductors connecting said processor unit to said antenna to couple said electrical signal to radiated waves around each of said two center frequencies,
wherein at least one of said electrical conductors are connected directly to said microstrip antenna, a separator slot at least partly isolates two conductive regions in said patch to impart to said antenna two resonances differing from each other in terms of the regions of said patch respectively occupied by said two resonances, said two resonances are centered in the respective two working bands, and said transmitter device further includes a reactive component external to said antenna connection arrangement and coupling said two conductive regions of said antenna and overlapping said ground.

1 more element

Dependencies are inferred from the claim text.

Planar antenna and a dual band transmission device including it

Life of this patent

Planar antenna and a dual band transmission device including it

Life of this patent

Abstract

Claims19