Dual-frequency antenna

• US 6,933,902 B2
• Filed: 01/21/2004
• Issued: 08/23/2005
• Est. Priority Date: 01/21/2004
• Status: Active Grant

• Current Assignee: Alpha Networks Incorporated
• Original Assignee: Alpha Networks Incorporated
• Inventors: Yeh, Ming-Hau
• Primary Examiner(s): Vo, Tuyet
• Assistant Examiner(s): VU, JIMMY T
• Application Number:
  US10/760,369
• Publication Number:
  US 20050156795A1
• Time in Patent Office: 580 Days
• Field of Search: 343/700.MS, 343/702, 343/762, 343/846
• US Class Current: 343/762
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 11/04 with parts bent, folded, shaped, screened or electrically loaded to obtain desired phase relation of radiation from selected sections of the antenna H01Q11/06 – H01Q11/10 take precedence
• CPC Class Codes: H01Q 9/00 Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements

Abstract

The present invention discloses a dual-frequency antenna, wherein a coplanar wave guide wire is printed onto a dielectric substrate, so that an end of the coplanar wave guide wire can be used as a signal input end, and a ground metal surface is printed onto the same side of the dielectric substrate at a position corresponding to the periphery of the coplanar wave guide wire. The ground metal surface keeps a certain distance from the coplanar wave guide wire, and the other end of the coplanar wave guide wire is extended outside the ground metal surface. A radiating member is extended from a side along the direction of the longitudinal axis, and a meandered conductive wire is extended from the other side at the end of the longitudinal axis. The radiating member is parallel to the conductive wire, and a gap is kept in parallel to the edge of the ground metal surface, so that each radiating member can be used to receive signals of different frequencies.

Claims

1. A dual-frequency antenna, directly printed onto a printed circuit board, comprising:

a dielectric substrate;

a coplanar wave guide wire, printed on a side of said dielectric substrate and using one end as a signal input end;

a ground metal surface;

printed onto a surface on the same side of said coplanar wave guide wire and at a position corresponding to the periphery of said coplanar wave guide wire, and said ground metal surface keeping a specific distance from said coplanar wave guide wire;

wherein another end of said coplanar wave guide wire being extended outside said ground metal surface and having a radiating member extended out from a side along the direction of its longitudinal axis for receiving a first operating frequency and a meandered conductive wire extended out from another side at the end of said longitudinal axis; and

another radiating member being extended out from the end of said meandered conductive wire for receiving a second operating frequency.

2. The dual-frequency antenna of claim 1, wherein said two radiating members are separated on two sides by said meandered conductive wire.

3. The dual-frequency antenna of claim 2, wherein said two radiating members are separated and parallel to each other.

4. The dual-frequency antenna of claim 3, wherein said two radiating members are separated and parallel to said ground metal surface.

5. A dual-frequency antenna, fixed on an edge of a printed circuit board, comprising:

a coplanar wave guide wire, printed on a side of a first dielectric substrate and using one end as a signal input end;

a ground metal surface;

printed onto a surface on the same side of said coplanar wave guide wire and at a position corresponding to the periphery of said coplanar wave guide wire, and said ground metal surface keeping a specific distance from said coplanar wave guide wire;

a second dielectric substrate, fixed on a side of said printed circuit board, having a conductive wire printed onto one side, and one end of said conductive wire being coupled to another end of said coplanar wave guide wire, another end of said conductive wire extending along the direction perpendicular to said ground metal surface, a radiating member extended out from the direction of the longitudinal axis of said conductive wire, a meandered conductive wire extended out from another side at an end of said conductive wire, and another radiating member extended from an end of said meandered conductive wire.

6. The dual-frequency antenna of claim 5, wherein said two radiating members are separated on two sides by said meandered conductive wire.

7. The dual-frequency antenna of claim 6, wherein said two radiating members are separated and parallel to each other.

8. The dual-frequency antenna of claim 7, wherein said two radiating members are separated and parallel to said ground metal surface.

9. The dual-frequency antenna of claim 8, wherein said second dielectric substrate is fixed onto an edge of said printed circuit board.

10. The dual-frequency antenna of claim 8, wherein said second dielectric substrate is fixed vertically onto an edge of said printed circuit board.

11. The dual-frequency antenna of claim 8, wherein said first and second operating frequencies are different frequencies.