Patent ID: 7460071

Claim:
An antenna arrangement comprising: first and second planar parallel antenna patches; and a feeding mechanism comprising first, second, third, and fourth feeding lines for electrically feeding the first antenna patch, wherein each feeding line is connected to the first antenna patch at feeding points angularly offset by 90 degrees from adjacent feeding points, wherein the first and second feeding points are offset by 180 degrees and the third and fourth feeding points are offset by 180 degrees such that the clockwise order of the succeeding feeding points is the first, the third, the second, and the fourth; wherein when all of the feeding lines are fed essentially in phase, a first constant E-field is generated in a slot between the edges of the first and second antenna patches; wherein when the first and second feeding lines are fed 180 degrees out of phase with each other, a second, sinusoidally varying E-field is generated in the slot between the edges of the first and second antenna patches; and wherein when the third and fourth feeding lines are fed 180 degrees out of phase with each other, a third, sinusoidally varying E-field is generated in the slot between the edges of the first and second antenna patches, said third sinusoidally varying E-field being rotated 90 degrees with respect to the second sinusoidally varying E-field.