Internal antenna for mobile communications device
First Claim
1. A balanced antenna for connecting to a balanced power amplifier stage in a portable communications device, the balanced power amplifier stage including first and second outputs, the antenna comprising a ground plane and first and second antenna elements spaced apart from the ground plane, wherein the first antenna element has a face lying in a first antenna plane and a second antenna element has a face lying in a second antenna plane, the faces are substantially parallel and spaced apart from each other in a direction perpendicular to one of the first and second antenna planes, and wherein each of the antenna elements has a feed point connectable to a different output from the power amplifier stage.
1 Assignment
0 Petitions
Accused Products
Abstract
A balanced antenna is provided for a mobile telephone which couples to the outputs from a balanced power amplifier stage without needing connection through a lossy conversion circuit. The balanced antenna comprises two radiating elements positioned opposite one another with the feed points positioned so that the radiating fields from the two elements superpose. A floating ground is also provided which reduces the effects of components located on the PCB under the antenna.
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Citations
18 Claims
- 1. A balanced antenna for connecting to a balanced power amplifier stage in a portable communications device, the balanced power amplifier stage including first and second outputs, the antenna comprising a ground plane and first and second antenna elements spaced apart from the ground plane, wherein the first antenna element has a face lying in a first antenna plane and a second antenna element has a face lying in a second antenna plane, the faces are substantially parallel and spaced apart from each other in a direction perpendicular to one of the first and second antenna planes, and wherein each of the antenna elements has a feed point connectable to a different output from the power amplifier stage.
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16. A portable communications device comprising a circuit board including a plurality of electronic components mounted thereon and a balanced antenna, the balanced antenna comprising first and second antenna elements mounted to the board, wherein the first antenna element has a face lying in a first antenna ilane and the second antenna element has a face lying in a second antenna plane and the faces are substantially parallel and spaced apart from each other in a direction perpendicular to one of the first and second antenna planes, each of the antenna elements having a top edge and a bottom edge, the bottom edge being nearer the board than the top edge, the device further comprising a ground plane disposed between the bottom edge of the antenna elements and the board, the ground plane being electrically isolated from the antenna elements and the board, and each of the antenna elements having a different feed point.
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17. A balanced antenna for a portable communications device, comprising a ground plane and first and second substantially similar antenna elements spaced apart from each other and from the ground plane, the first antenna element having a face lying in a first antenna plane and the second antenna element having a face lying in a second antenna plane, wherein the faces and the ground plane are substantially parallel and spaced apart from each other in a direction perpendicular to one of the first and second antenna planes, the first and second antenna elements are aligned in opposite directions with respect to one another and each of the antenna elements has a different feed point.
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18. A method of manufacturing a balanced antenna for connecting to a balanced power amplifier stage in a portable communications device, the balanced power amplifier stage including first and second outputs, the antenna comprising a ground plane and first and second antenna elements, the first antenna element having a face lying in a first antenna plane and the second antenna element having a face lying in a antenna planes, wherein the faces are spaced apart from each other in a direction perpendicular to one of the first and second antenna planes and from the ground plane, wherein the antenna elements are arranged to be opposite one another and to overlap to a predetermined extent, and each of the antenna elements has a feed point connectable to a different output from the balanced power amplifier stage, the method comprising varying the extent to which the antenna elements overlap to tune the antenna for use in a predetermined frequency band.
Specification