Antenna system and radio unit using the same
First Claim
1. An antenna system, comprising:
- a surface-mount type antenna portion which is configured by forming a radiation electrode for radio wave transmission/reception on a substrate; and
a metallic plate which is conductively connected to said radiation electrode of said surface-mount type antenna portion, and which performs radio wave transmission/reception together with said radiation electrode, wherein;
said surface-mount type antenna portion is mounted on a circuit board of a radio unit, using a bottom surface of said substrate as a mounting surface;
said metallic plate is provided so as to be isolated from said circuit board; and
said metallic plate is disposed adjacent to an outer side surface of said substrate of said surface-mount type antenna portion with a space there between so that the surface of said metallic plate is non-parallel with the bottom surface of said surface-mount type antenna portion.
1 Assignment
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Accused Products
Abstract
A reduced thickness radio unit without deteriorating antenna performance is disclosed. A metallic plate performing radio wave transmission/reception together with the radiation electrode, is conductively connected to the radiation electrode of a surface-mount type antenna. The metallic plate is preferably disposed so as to be opposed to the outer long-side surface of the substrate of the surface-mount type antenna with a space therebetween. Therefore, when mounting the metallic metal on a circuit board of the radio unit, the metallic plate does not face the circuit board surface and the top surface of a shield case, which are equivalent to ground. By thus disposing the metallic plate substantially perpendicularly to the circuit board, the problem of increase in electrostatic capacitance between the metallic plate and ground can be avoided, the increase in electrostatic capacitance being due to the reduction in thickness of the radio unit.
20 Citations
7 Claims
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1. An antenna system, comprising:
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a surface-mount type antenna portion which is configured by forming a radiation electrode for radio wave transmission/reception on a substrate; and
a metallic plate which is conductively connected to said radiation electrode of said surface-mount type antenna portion, and which performs radio wave transmission/reception together with said radiation electrode, wherein;
said surface-mount type antenna portion is mounted on a circuit board of a radio unit, using a bottom surface of said substrate as a mounting surface;
said metallic plate is provided so as to be isolated from said circuit board; and
said metallic plate is disposed adjacent to an outer side surface of said substrate of said surface-mount type antenna portion with a space there between so that the surface of said metallic plate is non-parallel with the bottom surface of said surface-mount type antenna portion. - View Dependent Claims (2, 3)
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4. A radio unit comprising an antenna system, the antenna system comprising:
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a surface-mount type antenna portion which is configured by forming a radiation electrode for radio wave transmission/reception on a substrate; and
a metallic plate which is conductively connected to said radiation electrode of said surface-mount type antenna portion, and which performs radio wave transmission/reception together with said radiation electrode, wherein;
said surface-mount type antenna portion is mounted on a circuit board of a radio unit, using a bottom surface of said substrate as a mounting surface;
said metallic plate is provided so as to be isolated from said circuit board; and
said metallic plate is disposed adjacent to an outer side surface of said substrate of said surface-mount type antenna portion with a space there between so that the surface of said metallic plate is non-parallel with the bottom surface of said surface-mount type antenna portion. - View Dependent Claims (5, 6, 7)
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Specification