Top loaded antenna

• US 5,181,044 A
• Filed: 11/13/1990
• Issued: 01/19/1993
• Est. Priority Date: 11/15/1989
• Status: Expired due to Fees

• Current Assignee: Asahi Matsushita Electric Works Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Asahi Matsushita Electric Works Ltd. (Panasonic Holdings Corporation)
• Inventors: Noda, Naoyuki, Matsumoto, Kazuhiro, Matsuo, Masayuki
• Primary Examiner(s): Hille, Rolf
• Assistant Examiner(s): LE, HOANGANH T
• Application Number:
  US07/611,498
• Time in Patent Office: 798 Days
• Field of Search: 343/752, 343/711, 343/712, 343/713, 343/749, 343/828, 343/829, 343/830, 343/846, 343/848, 343/700 MS
• US Class Current: 343/752
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 9/36 with top loading

Abstract

A top loaded antenna comprises a spaced pair of top load plate and a ground plate. A matching element integrally formed with a feedline and a shortline is disposed between the top plate and the ground plate for coupling between the plates, eliminating the necessity of separately and individually coupling the feedline element and shortline element to the plates.

Claims

1. A top-loaded antenna comprising:

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate, said matching element being made in the form of a printed board with conductive patterns which define said feedline means and said shortline means, said feedline means terminating with one end spaced from said ground plate to define thereat a coupling end for physical and electrical connection to a feed cable.

2. A top loaded antenna as set forth in claim 1, wherein said top load plate is formed as a printed board with a top load plane defining conductive layer.

3. A top loaded antenna as set forth in claim 1, wherein said ground plate is formed as a printed board with a ground plane defining conductive layer.

4. A top loaded antenna comprising:

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate wherein said ground plate is in the form of a metal sheet and said matching element is cut out from said ground plate and remains integral therewith and is bent towards said top load plate, said top load plate being secured thereto.

5. A top loaded antenna comprising:

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate wherein said top load plate is in the form of a metal sheet and said matching element is cut out from top load plate and remains integral therewith and is bent towards said ground plate with said ground plate being secured thereto.

6. A top loaded antenna comprising:

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate wherein said matching element is in the form of a printed board with a conductive pattern defining said feedline means and shortline means and wherein said conductive pattern includes a capacitive element.

7. A top loaded antenna comprising:

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate wherein said matching element is in the form of a printed board with a conductive pattern defining said feedline means and shortline means and wherein said conductive pattern includes an inductive element.

8. A mounting structure of a top loaded antenna on a panel having a mount open, which comprises:

said top loaded antenna comprising;

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate;

a housing accommodating said antenna to be placed on said panel, said housing having a tube projecting on a housing bottom into said opening of said panel for routing therethrough an antenna cable;

angle means provided at the end of said tube for guiding said antenna cable in an angle direction to an axis of said tube, said angle means being capable of bending said antenna cable at such an angle that said antenna cable can be guided along said panel in a direction substantially perpendicular to an axis of said tube.

9. A mounting structure for a top loaded antenna on a panel having a mount opening comprising:

said top loaded antenna comprising;

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate;

a housing accommodating said antenna to be placed on said panel, said housing having a tube projecting on a housing bottom into said opening of said panel for routing therethrough an antenna cable;

angle means provided at the end of said tube for guiding said antenna cable in an angle direction to an axis of said tube wherein said tube is formed in its peripheral wall with at least one slot which defines said angle means.

10. A mounting structure for a top loaded antenna comprising:

said top loaded antenna comprising;

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate;

a housing accommodating said antenna to be placed on said panel, said housing having a tube projecting on a housing bottom into said opening of said panel for routing therethrough an antenna cable;

angle means provided at the end of said tube for guiding said antenna cable in an angle direction to an axis of said tube wherein

said angle means comprises a generally L-shaped holder with a vertical leg and a horizontal leg, said vertical leg being secured within said housing to said antenna and extending into said tube, said horizontal leg extending out of said tube in an angled relation to the axis of said tube for guiding said antenna cable in the direction of said horizontal leg on the underside of said panel.

11. A mounting structure for a top loaded antenna on a panel having a mount opening comprising:

said top loaded antenna comprising;

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate;

a housing accommodating said antenna to be placed on said panel, said housing having a tube projecting on a housing bottom into said opening of said panel for routing therethrough an antenna cable;

angle means provided at the end of said tube for guiding said antenna cable in an angle direction to an axis of said tube wherein

said angle means comprises a generally L-shaped holder with a vertical leg and a horizontal leg, said vertical leg being secured within said housing to said antenna and extending into said tube, said horizontal leg extending out of said tube in an angled relation to the axis of said tube for guiding said antenna cable in the direction of said horizontal leg on the underside of said panel and further including a cap adapted to the end of said tube to conceal said horizontal leg.

12. A top-loaded antenna comprising:

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate, said matching element being in the form of a generally planar sheet cut out from one of said top load plate and said ground plate and remaining integrally attached to the plate from which it was cut and integrally including said feedline means and said shortline means, said feedline means terminating with one end spaced from said ground plate to define thereat a coupling end for physical and electrical connection to a feed cable.

13. A top loaded antenna as set forth in claim 12 wherein said shortline means and said feedline means are positioned side by side on said generally planar matching element.

14. A top-loaded antenna comprising:

a top load plate;

a ground plate spaced from said top load plate; and

a matching element integrally provided with feedline means and shortline means, said matching element coupling said top load plate to said ground plate, said matching element being made in the form of a generally planar sheet of a general "U" shape with two legs, one leg being shorter than the other, the longer leg comprising said shortline means and the shorter leg comprising said feedline means terminating with one end spaced from said ground plate to define thereat a coupling end for physical and electrical connection to a feed cable.

15. A top loaded antenna as set forth in claim 14 wherein said top load plate is formed as a printed board with a top load plane defining a conductive layer and said top load conductive layer includes at least one removable strip for frequency matching.