Planar antenna with two resonating frequencies
First Claim
1. A planar antenna comprising a planar radiating element (600) which is formed of a conductive area confined by a substantially continuous border line and split by a non-conductive gap which divides the planar radiating element into a first branch and second branch such that both the first branch and the second branch have respective outermost ends, an outermost end being defined as that part of a branch that is the electrically farthest point from a feed point where a local electric field maximum is generated when said antenna is in use, said gap has a head end on said substantially continuous border line and a tail end within the conductive area, the antenna operating in two frequency bands characterized in that at said head end (601) the gap has a certain first direction and at said tail end (603) a certain second direction which differs from the first direction by more than 90 degrees when the directions are defined along the gap from the head end towards the tail end, whereby the outermost end of the second branch confined by the gap, is located within the continuous border line surrounded by the first branch.
6 Assignments
0 Petitions
Accused Products
Abstract
A planar antenna comprises a planar radiating element (600) formed of a conductive area confined by a substantially continuous border line. The conductive area is split by a gap which divides the planar radiating element into a first branch and second branch such that both the first and the second branch have an outermost end. The gap has a head end on said substantially continuous border line and a tail end within the conductive area. At its head end (601) the gap has a certain first direction and at another point (603) a certain second direction which differs from the first direction by more than 90 degrees when the directions are defined along the gap from the head end towards the tail end. The outermost end of the second branch, confined by the gap, is located within the continuous border line, surrounded by the first branch.
149 Citations
10 Claims
- 1. A planar antenna comprising a planar radiating element (600) which is formed of a conductive area confined by a substantially continuous border line and split by a non-conductive gap which divides the planar radiating element into a first branch and second branch such that both the first branch and the second branch have respective outermost ends, an outermost end being defined as that part of a branch that is the electrically farthest point from a feed point where a local electric field maximum is generated when said antenna is in use, said gap has a head end on said substantially continuous border line and a tail end within the conductive area, the antenna operating in two frequency bands characterized in that at said head end (601) the gap has a certain first direction and at said tail end (603) a certain second direction which differs from the first direction by more than 90 degrees when the directions are defined along the gap from the head end towards the tail end, whereby the outermost end of the second branch confined by the gap, is located within the continuous border line surrounded by the first branch.
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10. A radio apparatus (700) which has a typical operating position and which comprises a planar radiating element (600) as an antenna, said radiating element being formed of a conductive area confined by a substantially continuous border line and split by a non-conductive gap which divides the planar radiating element into a first branch and second branch such that both the first branch and the second branch have respective outermost ends, an outermost end being defined as that pat of a branch that is the electrically farthest point from a feed point where a local electric field maximum is generated when said antenna is in use, said gap has a head end on said substantially continuous border line and a tail end within the conductive area, the antenna operating in two frequency bands characterized in that
at said head end (601) the gap has a certain first direction and at said tail end (603) a certain second direction which differs from the first direction by more than 90 degrees when the directions are defined along the gap from the head end towards the tail end, whereby the outermost end of the second branch, conied by the gap, is located within the continuous border line, surrounded by the first branch, and the radio apparatus comprises a ground plane (702) substantially parallel to the planar radiating element, located such that in said typical operating position it is between the planar radiating element and the user of the radio apparatus.
Specification