PARASITIC DIPOLE ASSISTED WLAN ANTENNA

• US 20100103064A1
• Filed: 10/23/2008
• Published: 04/29/2010
• Est. Priority Date: 10/23/2008
• Status: Abandoned Application

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Yang, Guangli, Liang, Xiaotao
• Application Number:
  US12/256,627
• Publication Number:
  US 20100103064A1
• Time in Patent Office: Days
• US Class Current: 343/793
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 19/005 Patch antenna using one or more coplanar parasitic elements
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

A parasitic dipole assisted WLAN antenna for creating a second resonance in the A band and providing greater bandwidth usage to a mobile computing or communication device. A secondary B/G band monopole antenna is connected to the A band antenna at the point of maximum impedance of the A band providing minimal interference between the two bands. The dipole structure antennas are connected at the A band loop antenna feed pin and ground pin.

Claims

1. A parasitic dipole assisted antenna for creating additional resonance and maximizing the usable bandwidth for a computing or communication device, the apparatus comprising:

a first band loop antenna for creating a resonance at a first band frequency;

a first band frequency dipole structure connected to the first band loop antenna for creating a second resonance at the first band frequency; and

a second band monopole antenna, connected to the first band loop antenna, for creating a resonance at a second band frequency.

2. The apparatus of claim 1, the first band comprises a wireless local area network A band.

3. The apparatus of claim 1, the second band comprises a wireless local area network B/G band.

4. The apparatus of claim 2, the A band loop antenna comprises a one wavelength loop antenna.

5. The apparatus of claim 3, the A band dipole structure comprises two one-quarter wavelength antenna elements.

6. The apparatus of claim 1, the parasitic dipole assisted antenna structure is attached to a non-conductive mounting block.

7. The apparatus of claim 6, the non-conductive mounting block is plastic.

8. The apparatus of claim 6, the non-conductive mounting block is attached to the printed circuit board of the computing or communication device.

9. The apparatus of claim 1, the second band monopole antenna is connected to the first band loop antenna at a point on the first band loop antenna where the impedance of the first band is at a maximum.

10. The apparatus of claim 1, the dipole structure is connected to the first band loop antenna as a first element connected to a feed pin and a second element connected to a ground pin.

11. The apparatus of claim 10, the attached dipole elements are within the first band loop antenna.

12. The apparatus of claim 11, the attached dipole elements are in the same plane as the first band loop antenna.

13. The apparatus of claim 9, the second band monopole antenna is attached in a plane perpendicular to the plane of first band loop antenna.

14. The apparatus of claim 3, the B/G band antenna comprises a one-quarter wavelength monopole antenna.

15. A method of creating a parasitic dipole assisted antenna for a computing device or a communication device, the method comprising:

analyzing a first band loop antenna to determine a field strength mapping;

determining the location on the first band loop antenna of maximum impedance;

attaching a second band monopole antenna at the location of the first band loop antenna maximum impedance; and

attaching a first band dipole antenna structure at the first band antenna loop feed pin and ground pin locations.

16. The method of claim 15, further comprising attaching the parasitic dipole assisted antenna to a non-conductive mounting block.

17. The method of claim 15, further comprising orienting the second band monopole antenna in a plane perpendicular to the plane of the first band loop antenna.

18. A parasitic dipole assisted antenna, the apparatus comprising:

means for creating a first resonance at a first band frequency;

means for creating a second resonance at the first band frequency; and

means for creating a resonance at a second band frequency.

19. The apparatus of claim 18, further comprising means for attaching the parasitic dipole assisted antenna to a printed circuit board.

20. The apparatus of claim 18, further comprising means for mounting means for creating the resonance at the second band frequency in a plane perpendicular to a plane for mounting means for creating the first resonance at the first band frequency.