Surface-mounted antenna and communications apparatus comprising same
First Claim
1. A surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a radiation electrode formed on at least an upper surface of said substrate, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate such that said current-feeding electrode faces said radiation electrode via a gap;
- said current-feeding electrode having a current-feeding point at one end and a grounding point at the other end, as well as a portion for achieving impedance matching by capacitance and inductance between said current-feeding point and said grounding point; and
an area ratio of said grounding electrode in a bottom surface of said substrate being 30% or less.
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Accused Products
Abstract
A surface-mounted antenna comprising a substrate made of a high-dielectric constant material having a dielectric constant ∈r of 6 or more, a ribbon-shaped radiation electrode having one end which is grounded and the other end which is open, a grounding electrode connected or capacitance-coupled to one end of the radiation electrode, and a current-feeding electrode in a portal shape formed on a side surface separate from the radiation electrode with a gap; the current-feeding electrode having a current-feeding portion at one end, a grounding portion at the other end, and a portion substantially in alignment with the radiation electrode between them; and the length of the aligning portion, a gap width or a portal shape being able to be properly set such that capacitance owned by the current-feeding electrode and inductance can be adjusted for easily achieving impedance matching.
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Citations
17 Claims
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1. A surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a radiation electrode formed on at least an upper surface of said substrate, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate such that said current-feeding electrode faces said radiation electrode via a gap;
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said current-feeding electrode having a current-feeding point at one end and a grounding point at the other end, as well as a portion for achieving impedance matching by capacitance and inductance between said current-feeding point and said grounding point; and
an area ratio of said grounding electrode in a bottom surface of said substrate being 30% or less.
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2. A surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a radiation electrode formed on at least an upper surface of said substrate, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate such that said current-feeding electrode faces said radiation electrode via a gap;
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said current-feeding electrode being constituted by two L-shaped electrodes formed on the opposing side surfaces of said substrate, which are connected via one I-shaped electrode formed on an end surface of said substrate;
one L-shaped electrode having a current-feeding portion at one end;
the other L-shaped electrode having a grounding portion at one end; and
said I-shaped electrode being a portion in alignment with said radiation electrode, whereby said current-feeding electrode is in a portal shape. - View Dependent Claims (3)
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4. A surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a radiation electrode formed on at least an upper surface of said substrate, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate such that said current-feeding electrode faces said radiation electrode via a gap;
said current-feeding electrode being in a portal shape having a current-feeding portion at one end and a grounding portion at the other end, as well as a portion in alignment with said radiation electrode via a gap between said radiation electrode and said current-feeding electrode, wherein an area ratio of said grounding electrode in a bottom surface of said substrate is 30% or less. - View Dependent Claims (5, 6, 7, 9, 10, 11)
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8. A surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a radiation electrode formed on at least an upper surface of said substrate, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate such that said current-feeding electrode faces said radiation electrode via a gap;
said current-feeding electrode being in a portal shape having a current-feeding portion at one end and a grounding portion at the other end, as well as a portion in alignment with said radiation electrode via a gap between said radiation electrode and said current-feeding electrode, wherein at least part of said radiation electrode extends from one end of said substrate toward the other end thereof in a longitudinal direction with its width narrowing substantially continuously and/or stepwise.
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12. A surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a radiation electrode formed on at least an upper surface of said substrate, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate such that said current-feeding electrode faces said radiation electrode via a gap;
said current-feeding electrode being in a portal shape having a current-feeding portion at one end and a grounding portion at the other end, as well as a portion in alignment with said radiation electrode via a gap between said radiation electrode and said current-feeding electrode, wherein said radiation electrode has a bent portion and the bent portion itself is in a shape of a meander, rectangular U, L or a crank, and wherein said radiation electrode and/or said current-feeding electrode has round corners.
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13. A surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a radiation electrode formed on at least an upper surface of said substrate, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate such that said current-feeding electrode faces said radiation electrode via a gap;
said current-feeding electrode being in a portal shape having a current-feeding portion at one end and a grounding portion at the other end, as well as a portion in alignment with said radiation electrode via a gap between said radiation electrode and said current-feeding electrode, wherein said antenna further comprises a second grounding electrode opposing the other end of said radiation electrode via a gap.
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14. A surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a ribbon-shaped radiation electrode formed on said substrate, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate separate from said radiation electrode with a desired gap;
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said radiation electrode being in a portal shape as a whole comprising an electrode portion formed on one side surface of said substrate in a longitudinal direction, which is connected to an L-shaped electrode portion formed on an upper surface of said substrate;
said current-feeding electrode comprising a current-feeding portion and a grounding portion each extending substantially vertically on the other side surface of said substrate, and an aligned portion extending between said current-feeding portion and said grounding portion substantially in parallel with said radiation electrode via said gap;
an area ratio of said grounding electrode in a bottom surface of said substrate being 30% or less; and
the shape and positional relation of said current-feeding electrode and said radiation electrode being modified to adjust capacitance and inductance for impedance matching. - View Dependent Claims (15)
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16. A communications apparatus comprising an antenna apparatus having a surface-mounted antenna comprising a substrate made of a dielectric or magnetic material, a radiation electrode formed on at least an upper surface of said substrate in a longitudinal direction, a grounding electrode formed on said substrate such that said grounding electrode is directly connected or capacitance-coupled to one end of said radiation electrode, and a current-feeding electrode formed on at least a side surface of said substrate such that said current-feeding electrode faces said radiation electrode via a gap;
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said current-feeding electrode being in a portal shape having a current-feeding portion at one end and a grounding portion at the other end, as well as a portion in alignment with said radiation electrode via a gap between said radiation electrode and said current-feeding electrode;
said surface-mounted antenna being mounted onto a circuit board; and
said surface-mounted antenna being mounted onto an area of said circuit board free from a ground conductor, such that said substrate is aligned in a longitudinal direction with an edge of said ground conductor with a gap, and that said current-feeding electrode is positioned on the side of said ground conductor. - View Dependent Claims (17)
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Specification