Patent ID: 7619577

Claim:
An open-slot antenna, comprising: a narrow and rectangular main metallic plate having a similarly shaped rectangular slot, said main metallic plate having two longer sections and two shorter sections surrounding said slot circumferentially; a first auxiliary metallic plate extended for a distance perpendicularly from a middle range of a second longer section of said metallic plate; a second auxiliary metallic plate extended for roughly said distance perpendicularly from said second longer section of said metallic plate to a side to said first auxiliary metallic plate with a spacing therebetween; and a coaxial cable having a core conductor wrapped inside an insulation layer which is in turn wrapped inside a metallic braid; wherein said first auxiliary metallic plate has a length along said second longer section longer than that of said second auxiliary metallic plate; said core conductor of said coaxial cable is welded to a spot along a first longer section of said main metallic plate between said first and second auxiliary metallic plates; and said metallic braid is welded to a spot along said second longer section of said main metallic plate between said first and second auxiliary metallic plates.