IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0493812
(2003-10-02)
|
우선권정보 |
JP-2002-290906(2002-03-10) |
국제출원번호 |
PCT/JP03/012643
(2003-10-02)
|
§371/§102 date |
20040427
(20040427)
|
국제공개번호 |
WO04/032282
(2004-04-15)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Matsushita Electric Industrial Co., Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
11 |
초록
▼
An antenna device has a circular radiation plate with a diameter of substantially 쩍 wavelength in electric length faced to a ground plate with a first power supply port and a second power supply port in its periphery. The power supply ports are disposed at positions where straight lines connecting r
An antenna device has a circular radiation plate with a diameter of substantially 쩍 wavelength in electric length faced to a ground plate with a first power supply port and a second power supply port in its periphery. The power supply ports are disposed at positions where straight lines connecting respective power supply ports to a midpoint of the radiation plate intersect at right angles. Four slits axisymmetric with respect the straight lines are disposed in radiation plate, and two sides of the periphery of each slit contact with each other.
대표청구항
▼
The invention claimed is: 1. An antenna device comprising: a ground plate; a radiation plate faced to the ground plate; and a plurality of power supply ports in a region having zero electric potential on the radiation plate, wherein the radiation plate has four slits axisymmetric with respect to a
The invention claimed is: 1. An antenna device comprising: a ground plate; a radiation plate faced to the ground plate; and a plurality of power supply ports in a region having zero electric potential on the radiation plate, wherein the radiation plate has four slits axisymmetric with respect to a first straight line group, the first straight line group connecting each of the power supply ports to a midpoint of the radiation plate, and two sides of each of the slits substantially contact with a second straight line group, the second straight line group intersecting the first straight line group at right angles at arbitrary points between ends of the radiation plate and the midpoint of the radiation plate. 2. An antenna device comprising: a ground plate; a radiation plate faced to the ground plate; and a plurality of power supply ports in a region having zero electric potential on the radiation plate, wherein the radiation plate has four slits axisymmetric with respect to a first straight line group, the first straight line group connecting each of the power supply ports to a midpoint of the radiation plate, two sides of each of the slits substantially contact with a second straight line group, the second straight line group intersecting the first straight line group at right angles at arbitrary points between ends of the radiation plate and the midpoint of the radiation plate, and a shape of the radiation plate is symmetric with respect to the midpoint of the radiation plate. 3. An antenna device according to claim 1, wherein the radiation plate is one of following radiation plates: an elliptic radiation plate where electric length of each of a major axis and a minor axis is substantially 쩍 wavelength of a desired frequency; and a radiation plate having a quadrangular shape except for a regularly polygonal shape, an electric length from one peripheral point to another peripheral point on the first straight line group being substantially 쩍 wavelength in the radiation plate. 4. An antenna device according to claim 2, wherein the radiation plate is one of following radiation plates: a circular radiation plate having a diameter of substantially 쩍 wavelength in electric length; and a regularly polygonal radiation plate in which electric length from one peripheral point to another peripheral point on the first straight line group is substantially 쩍 wavelength. 5. An antenna device according to claim 3, wherein two sides of each of the slits substantially contact with the second straight line group, the second straight line group intersecting the first straight line group at right angles at points substantially ⅛ wavelength in electric length away from a periphery of the radiation plate on the first straight line group. 6. An antenna device according to claim 1, wherein the power supply ports are disposed at ends of the radiation plate. 7. An antenna device according to claim 1, wherein the power supply ports are disposed on the first straight line group which connects arbitrary points of ends of the radiation plate to the midpoint of the radiation plate. 8. An antenna device according to claim 1, wherein the power supply ports are coupled to the radiation plate via gaps. 9. An antenna device according to claim 8, wherein the radiation plate and one of the power supply ports have parts with one of the gaps therebetween, the parts having an inter-digital structure. 10. An antenna device according to claim 1, wherein a third one of the power supply ports is disposed at the midpoint of the radiation plate. 11. An antenna device according to claim 1, wherein a resonant frequency in one of the power supply ports disposed at the midpoint of the radiation plate is different from a resonant frequency in another of the power supply ports. 12. An antenna device according to claim 1, wherein a distance between the radiation plate and the ground plate varies from an end of the radiation plate to the midpoint of the radiation plate on the first straight line group, and the distance between the radiation plate and the ground plate at the midpoint of the radiation plate is larger than that at a periphery of the radiation plate. 13. An antenna device according to claim 12, the distance between the radiation plate and the ground plate varies at a point substantially ⅛ wavelength in electric length away from the periphery of the radiation plate on the first straight line group. 14. An antenna device according to claim 3, further comprising a substrate made of dielectric material, magnetic material, or a mixture of the dielectric material and the magnetic material located between the radiation plate and the ground plate, wherein a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate varies at an arbitrary point between an end of the radiation plate and the midpoint of the radiation plate on the first straight line group, and a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate in a region close to the midpoint of the radiation plate is larger than a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate in a region close to the end of the radiation plate on the first straight line group. 15. An antenna device according to claim 3, further comprising a substrate made of dielectric material magnetic material, or a mixture of the dielectric material and the magnetic material located between the radiation plate and the ground plate, wherein a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate is large at a point substantially ⅛ wavelength in electric length away from a periphery of the radiation plate on the first straight line group. 16. An antenna device according to claim 1, wherein a plurality of notches are disposed at arbitrary positions at a periphery of the radiation plate axisymmetric with respect to the first straight line group. 17. An antenna device according to claim 1, wherein each of the power supply ports comprises a conductive wire, and the conductive wire forms an arbitrary angle with respect to the ground plate. 18. An antenna device according to claim 1, further comprising a plurality of reactance elements each having an opening tip, the reactive elements being located at respective positions symmetric to positions of the power supply ports with respect to a point, the point being one of a midpoint of a substantially circular radiation plate and an intersection point of diagonal lines of a substantially regularly polygonal radiation plate. 19. An antenna device according to claim 18, wherein isolation between the power supply ports is adjusted by cutting a periphery of tips of the reactance elements having the opening tips. 20. An antenna device according to claim 18, wherein the opened ends of the reactance elements are connected to the ground plate. 21. An antenna device according to claim 1, wherein each of the power supply ports is for diversity type communications. 22. An antenna device according to claim 1, wherein each of the power supply ports is for communications of a different system. 23. An antenna device according to claim 10, wherein a first of the power supply ports is for communications of a first system, and a second of the power supply ports and the third power supply port are for diversity type communications of a second system. 24. An antenna device according to claim 10, wherein a first of the power supply ports is for communications of a first system, and a second of the power supply ports and the third power supply port are for transmission and reception of a second system. 25. An antenna device according to claim 4, wherein two sides of each of the slits substantially contact with the second straight line group, the second straight line group intersecting the first straight line group at right angles at points substantially ⅛ wavelength in electric length away from a periphery of the radiation plate on the first straight line group. 26. An antenna device according to claim 2, wherein the power supply ports are disposed at ends of the radiation plate. 27. An antenna device according to claim 2, wherein the power supply ports are disposed on the first straight line group which connects arbitrary points of ends of the radiation plate to the midpoint of the radiation plate. 28. An antenna device according to claim 2, wherein the power supply ports are coupled to the radiation plate via gaps. 29. An antenna device according to claim 2, wherein a third one of the power supply ports is disposed at the midpoint of the radiation plate. 30. An antenna device according to claim 2, wherein a resonant frequency in one of the power supply ports disposed at the midpoint of the radiation plate is different from a resonant frequency in another of the power supply ports. 31. An antenna device according to claim 2, wherein a distance between the radiation plate and the ground plate varies from an end of the radiation plate to the midpoint of the radiation plate on the first straight line group, and the distance between the radiation plate and the ground plate at the midpoint of the radiation plate is larger than that at a periphery of the radiation plate. 32. An antenna device according to claim 4, further comprising a substrate made of dielectric material, magnetic material, or a mixture of the dielectric material and the magnetic material located between the radiation plate and the ground plate, wherein a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate varies at an arbitrary point between an end of the radiation plate and the midpoint of the radiation plate on the first straight line group, and a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate in a region close to the midpoint of the radiation plate is larger than a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate in a region close to the end of the radiation plate on the first straight line group. 33. An antenna device according to claim 12, further comprising a substrate made of dielectric material, magnetic material, or a mixture of the dielectric material and the magnetic material located between the radiation plate and the ground plate, wherein a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate varies at an arbitrary point between an end of the radiation plate and the midpoint of the radiations plate on the first straight line group, and a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate in a region close to the midpoint of the radiation plate is larger than a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate in a region close to the end of the radiation plate on the first straight line group. 34. An antenna device according to claim 4, further comprising a substrate made of dielectric material, magnetic material, or a mixture of the dielectric material and the magnetic material located between the radiation plate and the ground plate, wherein a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate is large at a point substantially ⅛ wavelength in electric length away from a periphery of the radiation plate on the first straight line group. 35. An antenna device according to claim 12, further comprising a substrate made of dielectric material magnetic material, or a mixture of the dielectric material and the magnetic material located between the radiation plate and the ground plate, wherein a value derived by dividing relative magnetic permeability of the substrate by relative dielectric constant of the substrate is large at a point substantially ⅛ wavelength in electric length away from the periphery of the radiation plate on the first straight line group. 36. An antenna device according to claim 2, wherein a plurality of notches are disposed at arbitrary positions at a periphery of the radiation plate axisymmetric with respect to the first straight line group. 37. An antenna device according to claim 2, wherein each of the power supply ports comprises a conductive wire, and the conductive wire forms an arbitrary angle with respect to the ground plate. 38. An antenna device according to claim 2, further comprising a plurality of reactance elements each having an opening tip, the reactive elements being located at respective positions symmetric to positions of the power supply ports with respect to a point, the point being one of a midpoint of a substantially circular radiation plate and an intersection point of diagonal lines of a substantially regularly polygonal radiation plate. 39. An antenna device according to claim 2, wherein each of the power supply ports is for diversity type communications. 40. An antenna device according to claim 2, wherein each of the power supply ports is for communications of a different system.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.