Bifurcated inverted F antenna

• US 6,903,693 B1
• Filed: 11/15/2002
• Issued: 06/07/2005
• Est. Priority Date: 11/15/2002
• Status: Active Grant

• Current Assignee: Plantronics, Inc.
• Original Assignee: Plantronics, Inc.
• Inventors: Evans, Steve C., Cahill, Stephen V., Lee, Barry J.
• Primary Examiner(s): Phan, Tho
• Application Number:
  US10/295,691
• Time in Patent Office: 935 Days
• Field of Search: 343/700.MS, 343/702, 343/829, 343/846
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/2291 used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN] H01Q1/241 takes precedence; WLAN in general H04W
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

A system and method for small built-in antennas that can be incorporated into short range communication devices such as cordless headsets are disclosed. The antenna is a built-in bifurcated inverted F antenna. The antenna generally includes two signal radiating and receiving arms of substantially equal electrical length extending generally parallel to each other along a longitudinal length of the antenna, the arms defining an opening therebetween extending along the longitudinal length of the antenna, a signal component in communication with the two arms for transmitting and receiving signals between the two arms and a signal contact of the wireless communication device, and a grounding component in contact with a grounding plane for grounding the antenna. The antenna may include an extension sloped relative to the grounding plane and extending between the grounding component and the arms to minimize the profile of the antenna. The wireless device may further include a printed circuit board onto which the antenna is secured. The device may also include a control in communication with the printed circuit board and extends through the opening between the two arms such that the control is symmetrically arranged relative to the two arms, approximately on a center line extending the longitudinal length of the device. The antenna is optionally tuned for a 1900 MHz or a 2400 MHz frequency band.

Claims

1. A wireless communication device, comprising:

a built-in bifurcated inverted F antenna having;

two signal radiating and receiving arms of substantially equal electrical length extending generally parallel to each other along a longitudinal length of the antenna, the arms defining an opening therebetween extending along the longitudinal length of the antenna,

a user interface disposed within the opening between the two arms of the antenna;

a signal component in communication with the two arms for transmitting and receiving signals between the two arms and a signal contact of the wireless communication device, and

a grounding component in contact with a grounding plane for grounding the antenna.

2. The communication device of claim 1, further comprising a sloped extension sloped relative to the grounding plane and extending between the grounding component and the arms for elevating the arms relative to the grounding plane.

3. The communication device of claim 1, wherein the antenna is supported by the signal component and the grounding component such that the two arms are suspended in free space.

4. The communication device of claim 1, wherein the signal component is disposed between the arms at one end of the opening and extends approximately perpendicularly relative to the arms.

5. The communication device of claim 1, wherein the user interface is selected from the group consisting of a control switch, control button, and light emitting diode (LED).

6. The communication device of claim 1, further comprising a printed circuit board onto which the bifurcated inverted F antenna is secured, the printed circuit boarding comprising the signal contact and the grounding plane.

7. The communication device of claim 6, wherein the user interface is a switch in communication with the printed circuit board, the switch extending through the opening between the two arms such that the switch is symmetrically arranged relative to the two arms.

8. The communication device of claim 6, further comprising a chassis for housing the printed circuit board and the built-in bifurcated inverted F antenna therein.

9. The communication device of claim 8, further comprising a control switch in communication with the printed circuit board, the control switch extending between the printed circuit board and the chassis through the opening between the two arms.

10. The communication device of claim 9, wherein the switch is disposed approximately on a center line extending the longitudinal length of the communication device.

11. The communication device of claim 1, wherein the antenna is tuned for a 2400 MHz frequency band.

12. The communication device of claim 1, wherein the antenna is tuned for a 1900 MHz frequency band.

13. The communication device of claim 12, wherein the arms are approximately 34.5 mm in length and 2.5 mm in width.

14. The communication device of claim 12, wherein the arms are separated by approximately 7 mm in width such that the opening is approximately 7 mm in width.

15. The communication device of claim 12, wherein the arms are elevated by approximately 5 mm in height from the grounding plane.

16. A wireless communication headset, comprising:

a bifurcated antenna for receiving signals, the antenna having two signal receiving arms of substantially equal electrical length extending generally parallel to each other, the arms defining an open space therebetween extending along a longitudinal length of the antenna, the open space being configured to contain a user interface disposed therein;

a speaker for outputting information received by the antenna; and

a signal converter for converting signals received by the antenna for output by the speaker.

17. The communication headset of claim 16, further comprising a microphone for receiving information for output by the antenna, wherein the antenna further outputs signals and wherein the signal converter further converts signals received by the microphone for output by the antenna.

18. The communication headset of claim 16, wherein the user interface is a control for the headset, the control being in communication with the signal converter, the control being symmetrically arranged on the headset and extends through the open space between the two antenna arms.

19. The communication headset of claim 16, wherein the antenna further includes a signal component in communication with the two arms and with the signal converter and a grounding component in contact with a grounding plane for grounding the antenna.

20. The communication headset of claim 19, wherein the antenna further includes a sloped extension extending between the grounding component and the arms for elevating the arms relative to the grounding plane.

21. The communication headset of claim 19, wherein the antenna is supported by the signal component and the grounding components such that the two arms are suspended in free space above the grounding plane.

22. The communication headset of claim 19, wherein the signal component is disposed between the arms and the signal converter and extends approximately perpendicularly relative to the arms and the signal converter.

23. The communication headset of claim 16, wherein the signal converter is a printed circuit board onto which the bifurcated antenna is secured.

24. The communication headset of claim 16, wherein the antenna is tuned for a 2400 MHz frequency band.

25. The communication headset of claim 16, wherein the antenna is tuned for a 1900 MHz frequency band.

26. The communication headset of claim 25, wherein the arms are approximately 34.5 mm in length and 2.5 mm in width.

27. The communication headset of claim 25, wherein the arms are separated by approximately 7 mm in width such that the open space is approximately 7 mm in width.

28. The communication headset of claim 25, wherein the arms are elevated by approximately 5 mm in height from the signal converter.

29. A wireless communication headset, comprising:

a bifurcated antenna for receiving signals, the antenna having two signal receiving arms of substantially equal electrical length extending generally parallel to each other, the arms defining an open space therebetween extending along a longitudinal length of the antenna, the antenna further having a signal component in communication with the two arms and with the signal converter and a grounding component in contact with a grounding plane for grounding the antenna, the signal component being disposed between the arms and the signal converter and extends approximately perpendicularly relative to the arms and the signal converter;

a speaker for outputting information received by the antenna; and

a signal converter for converting signals received by the antenna for output by the speaker.

30. A wireless communication device, comprising:

a built-in bifurcated inverted F antenna having;

two signal radiating and receiving arms of substantially equal electrical length extending generally parallel to each other along a longitudinal length of the antenna, the arms defining an opening therebetween extending along the longitudinal length of the antenna, the opening being configured to contain a user interface disposed therein;

a signal component in communication with the two arms for transmitting and receiving signals between the two arms and a signal contact of the wireless communication device, and

a grounding component in contact with a grounding plane for grounding the antenna.