Patent ID: 7646356

Claim:
An antenna for wireless data transmission, comprising: a first radiator that comprises a first spiral with a first feed point at an outer end of the first spiral and an open-circuit end at an inner end of the first spiral and functions as a first arm of a dipole antenna; and a second radiator that comprises a second spiral with a second feed point at an outer end of the second spiral and an open-circuit end at an inner end of the second spiral and functions as a second arm of the dipole antenna, wherein the first radiator and the second radiator are configured to: have a spatial gap between the first and the second radiators minimum in a range between 0.3 and 0.5 times a diameter of one of the first and the second spirals, be coiled identically, lie in a same plane or on a same material surface, have a gap between the first feed point and the second feed point minimum of 5*10 −3 times a freespace wavelength at an operating frequency of the antenna.