Internal antenna
First Claim
1. An internal planar antenna for a radio apparatus, comprising:
- a ground plane including at least first and second intersecting edges with corresponding opposite edges;
a radiating plane including a first side and a second side longer than the first side;
a feed conductor for the radiating plane;
a short-circuit conductor which connects the radiating plane to the ground plane at a short-circuit point located closer to the intersection of the intersecting edges than to the corresponding opposite edges; and
the ground plane including at least one non-conductive slot to improve matching of the antenna, a starting point of the slot being located in one of the first and second intersecting edges of the ground plane closer to the short-circuit point than to the opposite edges and the slot traveling substantially parallel to the long side of the radiating plane.
4 Assignments
0 Petitions
Accused Products
Abstract
An internal planar antenna for small radio apparatuses. The ground plane (310) of the planar antenna is shaped such that it improves the matching of the antenna. The shaping may be done by means of one or more slots (315, 316) in the ground plane. The slot suitably changes the electrical length of the ground plane as viewed from the short-circuit point (S) so that the ground plane will function as a radiator in an operating band of the antenna. Also the slot (331) in the ground plane can be arranged to function as an additional radiator in an operating band of the antenna. Antenna gain will increase as the matching is improved, and the upper band of a dual band antenna, for example, can be made broader.
119 Citations
20 Claims
-
1. An internal planar antenna for a radio apparatus, comprising:
-
a ground plane including at least first and second intersecting edges with corresponding opposite edges; a radiating plane including a first side and a second side longer than the first side; a feed conductor for the radiating plane; a short-circuit conductor which connects the radiating plane to the ground plane at a short-circuit point located closer to the intersection of the intersecting edges than to the corresponding opposite edges; and the ground plane including at least one non-conductive slot to improve matching of the antenna, a starting point of the slot being located in one of the first and second intersecting edges of the ground plane closer to the short-circuit point than to the opposite edges and the slot traveling substantially parallel to the long side of the radiating plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A radio apparatus with an internal planar antenna comprising:
-
a ground plane on a circuit board, the ground plane including at least first and second intersecting edges with corresponding opposite edges; a radiating plane including a first side and a second side longer than the first side; a feed conductor for the radiating plane; a short-circuit conductor which connects the radiating plane to the ground plane at a short-circuit point located closer to the intersection of the intersecting edges than to the corresponding opposite edges; and the ground plane including at least one non-conductive slot to improve matching of the antenna, a starting point of the slot being located in one of the first and second intersecting edges of the ground plane closer to the short-circuit point than to the opposite edges and the slot traveling substantially parallel to the long side of the radiating plane.
-
-
13. An internal planar antenna for a radio apparatus having at least a lower and an upper operating band, comprising:
-
a ground plane; a radiating plane; a feed conductor for the radiating plane, wherein said feed conductor passes through the circuit board at a feed point; and a short-circuit conductor which connects the radiating plane to the ground plane at a short-circuit point, the ground plane including a first and a second non-conductive slot to improve matching of the antenna, the second slot starting from the same edge of the ground plane as the first slot and traveling substantially parallel to the first slot, said feed point being located between the first and second slots on the circuit board. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
Specification