Reflector-provided dipole antenna

• US 6,008,773 A
• Filed: 05/18/1998
• Issued: 12/28/1999
• Est. Priority Date: 11/18/1996
• Status: Expired due to Fees

• Current Assignee: Hiroyuki Arai, Ido Corp., Nihon Dengyo Kosaku Co., Ltd.
• Original Assignee: Hiroyuki Arai, Ido Corp., Nihon Dengyo Kosaku Co., Ltd.
• Inventors: Arai, Hiroyuki, Satoh, Toshio, Nakano, Masayuki, Matsuoka, Tohru
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): VANNUCCI, JAMES
• Application Number:
  US09/080,147
• Time in Patent Office: 589 Days
• Field of Search: 343/818, 343/700 MS, 343/793, 343/817, 343/819, 343/820, 343/796, 343/806, 343/795
• US Class Current: 343/818
• CPC Class Codes: H01Q 19/108 Combination of a dipole with a plane reflecting surface H01Q19/106 takes precedence; strip line H01Q9/065

Abstract

The reflector-provided dipole-antenna shows outstanding performance in a wide frequency range and allows simultaneous transmission and reception at different frequencies. A dipole antenna element is provided at the back of a dielectric substrate set to the reflector surface. A parasitic element is provided on the front of the dielectric substrate, which is constituted by forming and protruding the central portion of a linear conductor forward in an almost trapezoidal shape, for example. The protruded portion is set to a position corresponding to the front of the feed point of the dipole antenna element and the portions of the said parasitic element towards the ends are set to positions corresponding to the rear of the dipole antenna element. A feed circuit provided on the face side of dielectric substrate is connected to a coaxial connector provided at the back of the reflector.

Claims

1. A reflector-provided dipole antenna comprising:

a dipole antenna element set to one side of a dielectric substrate provided at a reflector surface;

a feed circuit provided on said dielectric substrate; and

a parasitic element provided on another side of said dielectric substrate, the parasitic element having a central portion and two end portions, wherein the central portion is positioned corresponding to a feed point of said dipole antenna element and has a protruding shape relative to the two end portions, and wherein the two end portions are positioned to the rear of said dipole antenna element.

2. The reflector-provided dipole antenna according to claim 1, wherein a plane defined by the dielectric substrate is perpendicular to the reflector surface.

3. The reflector-provided dipole antenna according to claim 1, wherein the plane defined by the dielectric substrate is parallel to the reflector surface.

6. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion resembles three sides of a trapezoid and the two ends are straight lines.

9. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion resembles three sides of a trapezoid and the two ends are curved.

12. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion resembles two sides of a triangle and the two ends are straight lines.

15. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion resembles two sides of a triangle and the two ends are curved.

18. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion resembles a semi-circle and the two ends are straight lines.

21. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion resembles a semi-circle and the two ends are curved.

24. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion is formed by a series of straight line segments approximating a semi-circle and the two ends are straight lines.

27. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion is formed by a series of straight line segments approximating a semi-circle and the two ends are curved.

30. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion resembles three sides of a rectangle and the two ends are straight lines.

33. The reflector-provided dipole antenna according to claim 1, wherein the protruding shape of the central portion resembles three sides of a rectangle and the two ends are curved.

4. A reflector-provided dipole antenna comprising:

multiple dielectric substrates provided at a common reflector surface, having planes perpendicular to said common reflector surface, and positioned parallel to one another at a predetermined separation;

a dipole antenna element provided at one side of each of said multiple dielectric substrates;

a feed circuit provided for each of said multiple dielectric substrates;

a parasitic element provided at another side of each of said multiple dielectric substrates, the parasitic element having a central portion and two end portions, wherein the central portion is positioned corresponding to the feed point of said dipole antenna element and has a protruding shape relative to the two end portions, and wherein the two end portions are positioned to the rear of said dipole antenna element; and

a common feed circuit connected to each feed circuit provided for each of said multiple dielectric substrates.

7. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion resembles three sides of a trapezoid and the two ends are straight lines.

10. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion resembles three sides of a trapezoid and the two ends are curved.

13. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion resembles two sides of a triangle and the two ends are straight lines.

16. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion resembles two sides of a triangle and the two ends are curved lines.

19. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion resembles a semi-circle and the two ends are straight lines.

22. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion resembles a semi-circle and the two ends are curved.

25. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion is formed by a series of straight line segments approximating a semi-circle and the two ends are straight lines.

28. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion is formed by a series of straight line segments approximating a semi-circle and the two ends are curved.

31. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion resembles three sides of a rectangle and the two ends are straight lines.

34. The reflector-provided dipole antenna according to claim 4, wherein the protruding shape of the central portion resembles three sides of a rectangle and the two ends are curved.

5. A reflector-provided dipole antenna comprising:

a dielectric substrate provided for a front side of a common reflector, the plane of which is parallel with said reflector;

first and second dipole antenna elements arranged one each on one side of said dielectric substrate and being symmetrical to a center of said dielectric substrate;

first and second feed circuits, for the first and second dipole antenna elements, provided on said dielectric substrate;

first and second parasitic elements provided one each at another side of said dielectric substrate, said first and second parasitic elements each having a central portion and two end portions, wherein the central portion is positioned corresponding to a feed point of one of said dipole antenna elements and has a protruding shape relative to the two end portions, and wherein the two end portions are positioned to the rear of said one of said dipole antenna elements; and

a common feed circuit connected to first and second feed circuits for said first and second dipole antenna elements.

8. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion resembles three sides of a trapezoid and the two ends are straight lines.

11. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion resembles three sides of a trapezoid and the two ends are curved.

14. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion resembles two sides of a triangle and the two ends are straight lines.

17. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion resembles two sides of a triangle and the two ends are curved lines.

20. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion resembles a semi-circle and the two ends are straight lines.

23. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion resembles a semi-circle and the two ends are curved.

26. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion is formed by a series of straight line segments approximating a semi-circle and the two ends are straight lines.

29. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion is formed by a series of straight line segments approximating a semi-circle and the two ends are curved.

32. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion resembles three sides of a rectangle and the two ends are straight lines.

35. The reflector-provided dipole antenna according to claim 5, wherein the protruding shape of the central portion resembles three sides of a rectangle and the two ends are curved.