Planar antenna
First Claim
1. A planar antenna comprising within a radio device at least a first radiating plane and a ground plane, an antenna feed conductor connected to the radiating plane and a short circuit conductor between said planes, which feed conductor has a first point and a second point above a planar surface defined by the ground plane such that a vertical projection of the distance between the first and second points substantially is the same as the distance between the radiating plane and the ground plane, wherein the short circuit conductor surrounds the feed conductor for the whole length of a portion between the first and second points.
4 Assignments
0 Petitions
Accused Products
Abstract
Internal planar antenna especially applicable to mobile communication devices. A PIFA-type planar antenna is fed coaxially-like. This means that the feed conductor (321) of a radiating plane (310) is surrounded by a shield conductor (322) galvanically connected to the ground plane (GND) for the length between these planes. The shield conductor at the same time serves as a short circuit conductor for the antenna. The antenna is matched by means of a matching slot (317) going between the connection points of the feed and short circuit conductors, and/or of the shape of the short circuit conductor. A feed arrangement at issue increases antenna gain without increasing the SAR value of the antenna.
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Citations
14 Claims
- 1. A planar antenna comprising within a radio device at least a first radiating plane and a ground plane, an antenna feed conductor connected to the radiating plane and a short circuit conductor between said planes, which feed conductor has a first point and a second point above a planar surface defined by the ground plane such that a vertical projection of the distance between the first and second points substantially is the same as the distance between the radiating plane and the ground plane, wherein the short circuit conductor surrounds the feed conductor for the whole length of a portion between the first and second points.
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10. The planar antenna according to 2 or 9, wherein also the short circuit conductor comprises a strip-like extension to the conductive plate of the radiating plane, extending to the ground plane, and said conductive sheath is an extension to this strip-like part.
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12. A radio device comprising an internal planar antenna, which has a radiating plane and a ground plane, an antenna feed conductor connected to the radiating plane and a short circuit conductor between said planes, which feed conductor has a first point and a second point between planar surfaces defined by the radiating plane and ground plane such that a vertical projection of the distance between the first point and the second point substantially is the same as the distance between the radiating plane and the ground plane, the short circuit conductor surrounding the feed conductor for the whole length of a portion between the first and second points.
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13. A planar antenna comprising within a radio device a radiating plane and a ground plane, an antenna feed conductor connected to the radiating plane and a short circuit conductor between said planes, which feed conductor has a first point and a second point above a planar surface defined by the ground plane such that a vertical projection of the distance between the first and second points substantially is the same as the distance between the radiating plane and the ground plane, wherein the short circuit conductor surrounds the feed conductor for the whole length of a portion between the first and second points, the short circuit conductor forming a helix conductor around the feed conductor for the length of said portion between the first and second points.
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14. A planar antenna comprising within a radio device a radiating plane and a ground plane, an antenna feed conductor connected to the radiating plane and a short circuit conductor between said planes, which feed conductor has a first point and a second point above a planar surface defined by the ground plane such that a vertical projection of the distance between the first and second points substantially is the same as the distance between the radiating plane and the ground plane, wherein the short circuit conductor surrounds the feed conductor for the whole length of a portion between the first and second points, the radiating plane being a conductive layer on a surface of a part of a casing of the radio device and the inner surface of said part of the casing being a projection with an axial hole in it, and said portion between the first and second points in the feed conductor being a conductive layer on the surface of said hole, and a portion in the short circuit conductor surrounding that portion in the feed conductor being a conductive layer on the outer surface of said projection.
Specification