Directional coupler, antenna device, and transmitting-receiving device

• US 6,433,741 B2
• Filed: 07/02/1999
• Issued: 08/13/2002
• Est. Priority Date: 07/07/1998
• Status: Expired due to Fees

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Nagai, Tomohiro, Takakuwa, Ikuo, Tanizaki, Toru, Higashi, Kazutaka
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US09/346,601
• Publication Number:
  US 20010052876A1
• Time in Patent Office: 1,138 Days
• Field of Search: 343/700.MS, 343/713, 343/746, 343/748, 343/753, 343/762, 343/767, 343/771, 343/772, 333/161, 342/127
• US Class Current: 343/700.0MS
• CPC Class Codes: H01P 5/18 consisting of two coupled guides, e.g. directional couplers

Abstract

A directional coupler including a first transmission line and a second transmission line adjacent to the first transmission line, the relative positions of the first transmission line and the second transmission line being changeable, an antenna element connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the antenna element.

Claims

1. A directional coupler comprising a first microstrip line and a second microstrip line adjacent to the first microstrip line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first microstrip line and said second microstrip line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent.

2. The directional coupler of claim 1, further comprising an antenna element coupled to one of said microstrip lines.

3. A directional coupler comprising a first strip line and a second strip line adjacent to the first strip line, the relative positions of said first strip line and said second strip line being changeable.

4. The directional coupler of claim 3, further comprising an antenna element coupled to one of said strip lines.

5. A directional coupler comprising a first slot line and a second slot line adjacent to the first slot line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first slot line and said second slot line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent.

6. The directional coupler of claim 5, further comprising an antenna element coupled to one of said slot lines.

7. A directional coupler comprising a first coplanar line and a second coplanar line adjacent to the first coplanar line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first coplanar line and said second coplanar line being changeable in a direction extending along the longitudinal extent, one of said line having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent.

8. The directional coupler of claim 7, further comprising an antenna element coupled to one of said coplanar lines.

9. A directional coupler comprising a first waveguide and a second waveguide adjacent to the first waveguide, each waveguide having a longitudinal extent extending substantially parallel to each other, the relative positions of said first waveguide and said second waveguide being changeable in a direction extending along the longitudinal extent, one of said waveguides having a smaller longitudinal extent than the other of said waveguides whereby a substantially uniform coupling an be achieved despite relative movement of said waveguides when the waveguide having the smaller extent is bounded by the waveguide having the longer extent.

10. The directional coupler of claim 9, further comprising an antenna element coupled to one of said waveguides.

11. The directional coupler of claim 9, wherein at least one slot is provided in each wave guide for changing a degree of coupling.

12. A directional coupler comprising a first suspended line and a second suspended line adjacent to the first suspended line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first suspended line and said second suspended line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent.

13. The directional coupler of claim 12, further comprising an antenna element coupled to one of said suspended lines.

14. The directional coupler of claim 12, wherein at least one slot is provided coupled with each suspended line for changing a degree of coupling.

15. An antenna device including a directional coupler comprising a first microstrip line and a second microstrip line adjacent to the first microstrip line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first microstrip line and said second microstrip line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent that the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator.

16. An antenna device including a directional coupler comprising a first strip line and a second strip line adjacent to the first strip line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first strip line and said second strip line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator.

17. An antenna device including a directional coupler comprising a first slot line and a second slot line adjacent to the first slot line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first slot line and said second slot line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator.

18. An antenna device including a directional coupler comprising a first coplanar line and a second coplanar line adjacent to the first coplanar line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first coplanar line and said second coplanar line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator.

19. An antenna device including a directional coupler comprising a first waveguide and a second waveguide adjacent to the first waveguide, each waveguide having a longitudinal extent extending substantially parallel to each other, the relative positions of said first waveguide and said second waveguide being changeable in a direction extending along the longitudinal extent, one of said waveguides having a smaller longitudinal extent than the other of said waveguides whereby a substantially uniform coupling can be achieved despite relative movement of said waveguides when the waveguide having the smaller extent is bounded by the waveguide having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator.

20. An antenna device including a directional coupler comprising a first suspended line and a second suspended line adjacent to the first suspended line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first suspended line and said second suspended line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling an be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator.

21. A transmitting-receiving device including an antenna device comprising a directional coupler comprising a first microstrip line and a second microstrip line adjacent to the first microstrip line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first microstrip line and said second microstrip line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator, and a transmitting-receiving circuit connected to the antenna device.

22. A transmitting-receiving device including an antenna device comprising a directional coupler comprising a first strip line and a second strip line adjacent to the first strip line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first strip line and said second strip line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator, and a transmitting-receiving circuit connected to the antenna device.

23. A transmitting-receiving device including an antenna device comprising a directional coupler comprising a first slot line and a second slot line adjacent to the first slot line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first slot line and said second slot line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator, and a transmitting-receiving circuit connected to the antenna device.

24. A transmitting-receiving device including an antenna device comprising a directional coupler comprising a first coplanar line and a second coplanar line adjacent to the first coplanar line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first coplanar line and said second coplanar line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator, and a transmitting-receiving circuit connected to the antenna device.

25. A transmitting-receiving device including an antenna device comprising a directional coupler comprising a first waveguide and a second waveguide adjacent to the first waveguide, each waveguide having a longitudinal extent extending substantially parallel to each other, the relative positions of said first waveguide and said second waveguide being changeable in a direction extending along the longitudinal extent, one of said waveguides having a smaller longitudinal extent than the other of said waveguides whereby a substantially uniform coupling can be achieved despite relative movement of said waveguides when the waveguide having the smaller extent is bounded by the waveguide having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator, and a transmitting-receiving circuit connected to the antenna device.

26. A transmitting-receiving device including an antenna device comprising a directional coupler comprising a first suspended line and a second suspended line adjacent to the first suspended line, each line having a longitudinal extent extending substantially parallel to each other, the relative positions of said first suspended line and said second suspended line being changeable in a direction extending along the longitudinal extent, one of said lines having a smaller longitudinal extent than the other of said lines whereby a substantially uniform coupling can be achieved despite relative movement of said lines when the line having the smaller extent is bounded by the line having the longer extent, a primary radiator coupled or connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the primary radiator, and a transmitting-receiving circuit connected to the antenna device.