Patch antenna device

• US 20020047802A1
• Filed: 05/14/2001
• Published: 04/25/2002
• Est. Priority Date: 11/18/1998
• Status: Abandoned Application

• Current Assignee: Nokia Networks (Nokia Corporation)
• Original Assignee: Nokia Networks (Nokia Corporation)
• Inventors: Voipio, Veli
• Application Number:
  US09/854,817
• Publication Number:
  US 20020047802A1
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/0428 radiating a circular polarised wave
• CPC Class Codes: H01Q 9/0457 electromagnetically coupled to the feed line

Abstract

A patch antenna comprising a conductive ground plate (1), a conductive patch (2) arranged in parallel above said conductive ground plate (1), a feed conductor (6) for feeding said patch antenna, and a dielectric substrate material (5) arranged between the conductive ground plate (1) and the conductive patch (2), wherein the feed conductor (6) is connected to one side of the dielectric substrate material (5) and the conductive patch (2) is connected to another side of said electric substrate material (5). The dielectric material provided between the patch and the ground plate serves at increasing cross-polarization separation and matching the antenna impedance. Thus, cross-polar separation and increased bandwidth can be achieved within the patch antenne in a simple and cost-effective way. Moreover, an ordinary probe feed and coaxial cables can be used and precise small capacitance can be implemented.

Claims

1. A patch antenna device comprising:

a) a conductive ground plate (1);

b) a conductive patch (2) arranged in parallel above said conductive ground plate (1);

c) a feed conductor (6) for feeding said patch antenna; and

d) a dielectric substrate material (5) arranged between said conductive ground plate (1) and said conductive patch (2), wherein said feed conductor (6) is connected to one side of said dielectric substrate material (5) and said conductive patch (2) is connected to another side of said dielectric substrate material (5).

2. A patch antenna device according to claim 1, wherein said feed conductor is a center conductor (6) of a coaxial feed, said center conductor (6) protruding from said conductive ground plate (1) towards said one side of said dielectric substrate material (5).

3. A patch antenna device according to claim 2, wherein a coaxial connector (7) is fixed to said conductive ground plate (1) at a side opposite to the side from which said center conductor (6) protrudes, and wherein said center conductor (6) is connected via a through hole of said conductive ground plate (1) to said coaxial connector (7).

4. A patch antenna device according to any one of claims 1 to 3, wherein said dielectric substrate material is a dielectric plate (5) having a metallized bottom surface and an optional metallized top surface, said dielectric plate (5) being arranged in parallel with said conductive patch (2) and said conductive ground plate (1).

5. A patch antenna device according to claim 4, wherein said conductive patch (2) is a rectangular half-wave patch.

6. A patch antenna device according to claim 4, wherein a second rectangular half-wave patch (3) is arranged above said half-wave patch (2).

7. A patch antenna device according to claim 5 or 6, wherein the top surface of said dielectric plate (5) is in direct contact with said half-wave patch (2) at a position between the center of said half-wave patch (2) and the center of an edge of said half-wave patch (2) and wherein said feed conductor (6) is connected to a metal layer (8) arranged on the bottom surface of said dielectric plate (5).

8. A patch antenna device according to claim 7, wherein a second dielectric plate and feed conductor is arranged at a position between the center of said half-wave patch (2) and the center of another edge of said half-wave patch (2), said other edge extending orthogonal to said edge.

9. A patch antenna device according to any one of claims 1 to 3, wherein said conductive patch (2) is a quarter-wave patch shorted at one end.

10. A patch antenna device according to claim 9, wherein said dielectric substrate material is a dielectric plate having a metallized top and bottom surface and being arranged at a predetermined distance from said shorted end.

11. A patch antenna device according to claim 10, wherein said feed conductor is connected to said metallized bottom surface, and said quarter-wave patch is connected via another feed conductor to said metallized bottom surface.

12. A patch antenna device according to any one of claims 1 to 11, wherein said patch antenna is arranged in an antenna array of a base station of a cellular communication network.