Antenna device
First Claim
1. An antenna device for high frequency comprising:
- a radiator made of a planar conductor having one of shapes of;
(i) a substantial circle whose diameter is a substantially half wavelength;
(ii) a substantially regular polygon where a length of a diagonal line passing through a center point of the regular polygon is a substantially half wavelength; and
(iii) a substantial quadrangle whose edge length is a substantially half wavelength;
a ground plate separated from the radiator by a predetermined distance and disposed in parallel with the radiator;
a first feeding port coupled to a first feeding point on the radiator; and
a second feeding port coupled to a second feeding point on the radiator,whereinthe first feeding point is disposed in a region where high-frequency voltage generated by feeding from the second feeding port is zero, andthe second feeding point is disposed in a region where high-frequency voltage generated by feeding from the first feeding port is zero, andwherein a line segment passing through a center point of the radiator and the first feeding point and a line segment passing through the center point of the radiator and the second feeding point intersect at substantially right angles, andwherein a third feeding port is coupled to a center point of the radiator to isolate the third feeding port from the first and second feeding ports.
1 Assignment
0 Petitions
Accused Products
Abstract
A small antenna has two or more feeding ports. A radiator is made of a planar conductor having a substantially circular shape having the diameter of a substantially half wavelength or a substantially regularly polygonal shape where the length of a diagonal line passes through the center point is the substantially half wavelength. A ground plate is faced to the radiator. On the radiator, the feeding ports are connected to feeding points on two orthogonal line segments passing through the center of the radiator. This antenna is used as not only a single antenna but also two independent antennas having secured isolation between the feeding ports. A small antenna device used as two independent antennas is thus provided. The radiator is formed in a hat shape having an edge, has an Stepped Impedance Resonator (SIR) structure where the diameter of a crest part is a quarter wavelength, and is shortened.
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Citations
25 Claims
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1. An antenna device for high frequency comprising:
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a radiator made of a planar conductor having one of shapes of; (i) a substantial circle whose diameter is a substantially half wavelength; (ii) a substantially regular polygon where a length of a diagonal line passing through a center point of the regular polygon is a substantially half wavelength; and (iii) a substantial quadrangle whose edge length is a substantially half wavelength; a ground plate separated from the radiator by a predetermined distance and disposed in parallel with the radiator; a first feeding port coupled to a first feeding point on the radiator; and a second feeding port coupled to a second feeding point on the radiator, wherein the first feeding point is disposed in a region where high-frequency voltage generated by feeding from the second feeding port is zero, and the second feeding point is disposed in a region where high-frequency voltage generated by feeding from the first feeding port is zero, and wherein a line segment passing through a center point of the radiator and the first feeding point and a line segment passing through the center point of the radiator and the second feeding point intersect at substantially right angles, and wherein a third feeding port is coupled to a center point of the radiator to isolate the third feeding port from the first and second feeding ports. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An antenna device for high frequency comprising:
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a radiator made of a planar conductor having one of shapes of; (i) a substantial circle whose diameter is a substantially half wavelength; (ii) a substantially regular polygon where a length of a diagonal line passing through a center point of the regular polygon is a substantially half wavelength; and (iii) a substantial quadrangle whose edge length is a substantially half wavelength; a around plate separated from the radiator by a predetermined distance and disposed in parallel with the radiator; a first feeding port coupled to a first feeding point on the radiator; and a second feeding port coupled to a second feeding point on the radiator, wherein the first feeding point is disposed in a region where high-frequency voltage generated by feeding from the second feeding port is zero, and the second feeding point is disposed in a region where high-frequency voltage generated by feeding from the first feeding port is zero, and wherein a line segment passing through a center point of the radiator and the first feeding point and a line segment passing through the center point of the radiator and the second feeding point intersect at substantially right angles, wherein the radiator has a crest part and a trough part, a top surface of the crest part includes the center point and a central part of the radiator, a distance between a top surface of the crest part and the ground plate is longer than a distance between the trough part and the ground plate, and the trough part is a part other than the crest part of the radiator and other than the center point and a central part of the radiator. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An antenna device for high frequency comprising:
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a radiator made of a planar conductor having one of shapes of; (i) a substantial circle whose diameter is a substantially half wavelength; (ii) a substantially regular polygon where a length of a diagonal line passing through a center point of the regular polygon is a substantially half wavelength; and (iii) a substantial quadrangle whose edge length is a substantially half wavelength; a ground plate separated from the radiator by a predetermined distance and disposed in parallel with the radiator; a first feeding port coupled to a first feeding point on the radiator; and a second feeding port coupled to a second feeding point on the radiator, wherein the first feeding point is disposed in a region where high-frequency voltage generated by feeding from the second feeding port is zero, and the second feeding point is disposed in a region where high-frequency voltage generated by feeding from the first feeding port is zero, and wherein a line segment passing through a center point of the radiator and the first feeding point and a line segment passing through the center point of the radiator and the second feeding point intersect at substantially right angles, and wherein the ground plate has a crest part and a trough part, the ground plate has one of shapes of; (i) a substantial circle whose diameter is a substantially half wavelength; (ii) a substantially regular polygon where a length of a diagonal line passing through a center point of the polygon is a substantially half wavelength; and (iii) a substantial quadrangle whose edge length is a substantially half wavelength; and the crest part is formed in such a manner that, a top surface of the crest part includes a center point and a central part of the ground plate, a distance between the top surface of the crest part and the radiator is longer than a distance between the trough part and the radiator, and the trough part is a part other than the crest part and other than the center point and the central part of the around plate. - View Dependent Claims (21, 22)
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23. An antenna device for high frequency comprising:
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a radiator made of a planar conductor having one of shapes of; (i) a substantial circle whose diameter is a substantially half wavelength; (ii) a substantially regular polygon where a length of a diagonal line passing through a center point is a substantially half wavelength; and (iii) a substantial quadrangle of whose edge length is a substantially half wavelength; a ground plate which is separated from the radiator by a predetermined distance and is disposed in parallel with the radiator; a first feeding port coupled to a first, feeding point on the radiator; and a second feeding port coupled to a second feeding point disposed on a line segment orthogonal to a line segment passing through the center of the radiator and the first feeding point, wherein the first and the second feeding ports are used as feeding ports of an antenna in a diversity communication system, wherein a third feeding port is coupled to the center of the radiator, and the first, the second, and the third feeding ports are used as further feeding ports of the antenna in the diversity communication system, wherein the first and the second feeding ports are used as feeding ports of an antenna in a first diversity communication system, and the third feeding port is used in a second communication system.
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24. An antenna device for high frequency comprising:
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a radiator made of a planar conductor having one of shapes of; (i) a substantial circle whose diameter is a substantially half wavelength; (ii) a substantially regular polygon where a length of a diagonal line passing through a center point is a substantially half wavelength; and (iii) a substantial quadrangle of whose edge length is a substantially half wavelength; a ground plate which is separated from the radiator by a predetermined distance and is disposed in parallel with the radiator; a first feeding port coupled to a first feeding point on the radiator; and a second feeding port coupled to a second feeding point disposed on a line segment orthogonal to a line segment passing through the center of the radiator and the first feeding point, wherein the first and the second feeding ports are used as feeding ports of an antenna in a diversity communication system; wherein a third feeding port is coupled to the center of the radiator, and the first, the second, and the third feeding ports are used as further feeding ports of the antenna in the diversity communication system, wherein the first and the second feeding ports are used as feeding ports of a circular polarization antenna in a first diversity communication system employing circular polarization, and the third feeding port is used in a second communication system.
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25. An antenna device for high frequency comprising:
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a radiator made of a conductor having a conical shape, a diameter of the conical shape being a substantially half wavelength; a ground plate separated from the radiator by a predetermined distance and disposed in parallel with the radiator; a first feeding port coupled to a first feeding point on the radiator; and a second feeding port coupled to a second feeding point on the radiator, wherein a distance between the ground plate and the radiator is longer at an apex thereof than at other parts thereof than the apex, the first feeding point is disposed in a region where high-frequency voltage generated by feeding from the second feeding port is zero, and the second feeding point is disposed in a region where high-frequency voltage generated by feeding from the first feeding port is zero, and wherein a line segment passing through a center point of the radiator and the first feeding point and a line segment passing through the center point of the radiator and the second feeding point intersect at substantially right angles.
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Specification