Planar antenna

• US 8,022,887 B1
• Filed: 10/26/2006
• Issued: 09/20/2011
• Est. Priority Date: 10/26/2006
• Status: Active Grant

• Current Assignee: SiBEAM, Inc. (Lattice Semiconductor Corporation)
• Original Assignee: SiBEAM, Inc. (Lattice Semiconductor Corporation)
• Inventors: Zarnaghi, Rokhsareh
• Primary Examiner(s): Choi; Jacob Y
• Assistant Examiner(s): Karacsony; Robert
• Application Number:
  US11/588,472
• Time in Patent Office: 1,790 Days
• Field of Search: 343/803, 343/833, 343/859, 343/700.MS, 343846-849, 343810-821
• US Class Current: 343/846
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 19/22 using a secondary device in the form of a single substantially straight conductive element
• CPC Class Codes: H01Q 21/062 using dipole aerials; H01Q21/067, H01Q21/068 take precedence
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

An antenna is disclosed. In one embodiment, the antenna comprises a driver comprising a folded dipole and an integral balun coupled to the folded dipole.

Claims

1. A planar antenna comprising:

a driver having a folded dipole;

coplanar strips coupled with the driver;

an integral balun coupled with the coplanar strips;

a substrate, with a first side and a second side opposite to the first side, having a dielectric constant of at least 10, the first side coupled with the driver, the coplanar strips, and the integral balun;

a truncated ground plane coupled with the second side of the substrate, the truncated ground plane having a continuous serrated edge for reflecting waves; and

a feeding structure having a coplanar waveguide (CPW), on the first side of the substrate, coupled with the integral balun to feed the integral balun.

2. The planar antenna defined in claim 1 further comprising a differential input structure on the first side of the substrate, the differential input structure coupled with the integral balun and the coplanar strips.

3. The planar antenna defined in claim 1 further comprising:

one or more directors, wherein the one or more directors and the driver are on the first side of the substrate.

4. The planar antenna defined in claim 1, wherein the folded dipole and the integral balun are on the first side of the substrate.

5. The planar antenna defined in claim 1, wherein the feeding structure is a balanced feeding structure.

6. The planar antenna in claim 1, wherein the integral balun comprises a microstrip line.

7. The planar antenna in claim 2, wherein the differential input structure comprises a microstrip line.

8. The planar antenna in claim 1, wherein the truncated ground resides between the driver and the feeding structure.

9. A planar antenna comprising:

a driver having a folded dipole;

an integral balun coupled with the driver;

a substrate with a first side and a second side opposite to the first side, the first side coupled with the driver and the integral balun;

a truncated ground plane coupled with the second side of the substrate and having a continuous serrated edge for reflecting waves; and

a feeding structure on the first side of the substrate coupled with the integral balun to feed the integral balun.

10. The planar antenna defined in claim 9 further comprising a differential input structure on the first side of the substrate, the differential input structure coupled with the integral balun and coplanar strips, wherein the coplanar strips are coupled with the driver.

11. The planar antenna in claim 10, wherein the differential input structure comprises a microstrip line.

12. The planar antenna defined in claim 9 further comprising:

one or more directors, wherein the one or more directors and the driver are on the first side of the substrate.

13. The planar antenna defined in claim 9, wherein the folded dipole and the integral balun are on the first side of the substrate.

14. The planar antenna defined in claim 9, wherein the feeding structure is a balanced feeding structure.

15. The planar antenna in claim 9, wherein the integral balun comprises a microstrip line.

16. The planar antenna in claim 9, wherein the truncated ground resides between the driver and the feeding structure.

17. The planar antenna in claim 9, wherein the truncated ground has a straight edge.

18. The planar antenna in claim 9, wherein the substrate has a dielectric constant which is at least 10.