Antenna device
First Claim
1. An antenna device comprising:
- a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, and wherein a conductive coupling plate is provided near said radiating plate, via an insulating member, across said slit.
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Accused Products
Abstract
A small antenna device having a wide frequency band suitable for being built in mobile communications apparatuses. This antenna device includes a planar radiating element (radiating plate) and a grounding plate provided in parallel to and facing the radiating plate. A feeding line is disposed at approximately the end center of the radiating plate, and supplies high-frequency signals. A shorting portion shorts the radiating plate and grounding plate at near the feeding line. A slit is provided at an end face of the radiating plate approximately opposing the feeding line to form two resonators. A coupling level between two resonators is optimized by adjusting the shape or dimensions of this slit, or loading a reactance element or conductive plate on this slit. Accordingly, a small and short antenna with a preferred characteristic is achieved.
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Citations
29 Claims
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1. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, and wherein a conductive coupling plate is provided near said radiating plate, via an insulating member, across said slit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein a coupling level between said two resonators is adjusted by partially changing a width of said slit, and wherein a coupling plate and at least one of said two resonators are shorted.
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12. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein a reactance element is one of added to and formed on between said grounding plate and a part of at least one of said two resonators, wherein said reactance element is formed by at least one of a coupling plate, comb element, microstrip line, chip capacitor, and chip inductor, and wherein a capacitance of said element is adjusted by changing a teeth shape of said element.
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13. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, and wherein said slit is branched to a rough T-shape about midway, and at least one of said two resonators includes at least one of;
a capacitance element one of added to and formed on an area where a high-frequency electric field is dominant; and
an inductance element one of added to and formed on an area where a high-frequency magnetic field is dominant. - View Dependent Claims (14)
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15. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein said slit is branched to a rough T-shape about midway, and at least one of these branched slits is bent approximately perpendicularly at near a side of said radiating plate toward a start point of said slit, and at least one of said two resonators includes at least one of;
a capacitance element one of add to and formed on an area where a high-frequency electric field is dominant; and
an inductance element one of added to and formed on an area where a high-frequency magnetic field is dominant. - View Dependent Claims (16)
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17. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein;
said radiating plate is divided into two areas by a rough perpendicular bisector to a line from a point where said shorting portion is provided (shorting point) and a start point of said slit, said two areas being an area where said start point is present (first area) and an area where said shorting point is present (second area); and
when an end point of said slit lies on said second area;
a capacitance element is one of added to and formed on said first area; and
an inductance element is one of added to and formed on said second area. - View Dependent Claims (18)
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19. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein said radiating plate is divided into two areas by a rough perpendicular bisector to a line from a point where said shorting portion is provided (shorting point) and a start point of said slit, said two areas being an area where said start point is present (first area) and an area where said shorting point is present (second area); and
a capacitance element is one of added to and formed on said second area when said slit is progressively made longer passing through said second area and its end point of the slit is present in said first area. - View Dependent Claims (20)
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21. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein said radiating plate is divided into two areas by a rough perpendicular bisector to a line from a point where said feeding line is provided (feeding point) and a start point of said slit, said two areas being an area where said start point is present (first area) and an area where said feeding point is present (second area); and
when an end point of said slit lies on said second area;
a capacitance element is one of added to and formed on said first area; and
an inductance element is one of added to and formed on said second area. - View Dependent Claims (22)
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23. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein said radiating plate is divided into two areas by a rough perpendicular bisector to a line from a point where said feeding line is provided (feeding point) and a start point of said slit, said two areas being an area where said start point is present (first area) and an area where said feeding point is present (second area); and
a capacitance element is one of added to and formed on said second area when said slit is progressively made longer passing through said second area and an end point of the slit is present in said first area. - View Dependent Claims (24)
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25. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein said slit is branched to said first resonator side and said second resonator side about midway as a first slit and a second slit, and said radiating plate is divided into two areas by a perpendicular bisector to a line from a point where a shorting portion is provided (shorting point) on said radiating plate and a start point of said slit, said areas being an area where said start point is present (first area) and an area where said shorting point is present (second area);
when an end point of said first slit lies on said second area, said first resonator has;
a capacitance element is one of added to and formed on said first area; and
an inductance element one of added to and formed on said second area in said first resonator; and
when said second slit passes through said second area and an end point of said second slit lies on said first area, said second resonator has;
a capacitance element one of added to and formed on said second area in said second resonator. - View Dependent Claims (26)
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27. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein said slit is branched to said first resonator side and said second resonator side about midway as a first slit and a second slit, and said radiating plate is divided into two areas by a perpendicular bisector to a line from a point where a feeding line is provided (feeding point) on said radiating plate and a start point of said slit, said areas being an area where said start point is present (first area) and an area where said feeding point is present (second area);
when an end point of said first slit lies on said second area, said first resonator has;
an capacitance element is one of added to and formed on said first area; and
an inductance element is one of added to and formed on said second area in said first resonator; and
when said second slit passes through said second area and an end point of said second slit lies on said first area, said second resonator has;
a capacitance element is one of added to and formed on said second area in said second resonator. - View Dependent Claims (28)
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29. An antenna device comprising:
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a radiating plate;
a feeding line provided to one of a side and an end of said radiating plate;
a grounding plate provided facing said radiating plate; and
a shorting portion whose one end is disposed near said feeding line and an other end is connected to said grounding plate;
wherein two resonators including a first resonator and a second resonator are formed on said radiating plate by providing a slit on a side face or an end face of said radiating plate approximately opposing said feeding line, and said antenna device has an wide band frequency range responsive to a coupling level between said two resonators, wherein said resonators have a meander shape.
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Specification