Method for sharing antennas of a wireless device

• US 7,444,119 B2
• Filed: 11/30/2004
• Issued: 10/28/2008
• Est. Priority Date: 11/30/2004
• Status: Active Grant

• Current Assignee: Symbol Technologies, LLC (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Bekritsky, Benjamin Jay
• Primary Examiner(s): Phu; Sanh D
• Application Number:
  US11/001,537
• Publication Number:
  US 20060116182A1
• Time in Patent Office: 1,428 Days
• Field of Search: 455/553.1, 455/41.1, 455/41.2, 455/552.1, 455/426.1, 327/268
• US Class Current: 455/41.2
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H04B 7/0808 comparing all antennas before reception

Abstract

The present invention proposes novel antenna means mounted on handheld devices and methods of use of such antenna means with multiple radios. The novel antenna means exhibit smaller sizes, good performance, have higher reliability, and exhibit novel hardware configurations. The novel methods of utilization for the antenna means comprise the reception of an 802.11 RF signal to the antennas, the acquisition step while a radio is determining which antenna has the better signal and acquiring signal from that antenna, and usage by the Bluetooth signal of the remaining antenna.

Claims

1. A method, comprising:

receiving a radio frequency signal using first and second antennas;

determining signal characteristics, including a signal strength of the received radio frequency signal;

selecting one of the first and second antennas as a function of the signal characteristics, wherein the selection maximizes the signal strength of the received radio frequency signal;

coupling the selected antenna to a first signal line communicating signals according to a first wireless protocol; and

coupling the non-selected antenna to a second signal line communicating signals according to a second wireless protocol.

2. The method of claim 1, wherein the first and second antennas comprise antenna pairs.

3. The method of claim 1, wherein the radio frequency signal is an IEEE 802.11 signal, the first wireless protocol is an IEEE 802.11 standard and the second wireless protocol is a Bluetooth protocol.

4. The method of claim 1, wherein the signal characteristics include at least one of (i) a signal strength and (ii) a signal to noise ratio.

5. The method of claim 4, wherein the selecting comprises:

selecting the one of the first and second antennas as a function of a greater of at least one of (i) the signal strength and (ii) the signal to noise ratio exhibited by the received radio frequency signal using the first and second antennas.

6. The method of claim 1, wherein the first and second antennas remain coupled to the respective first and second signal lines for a duration of a packet included in the radio frequency signal.

7. The method of claim 1, further comprising:

communicating a further radio frequency signal on the non-selected antenna simultaneously with receiving the radio frequency signal.

8. A method, comprising:

receiving a radio frequency signal using first and second antennas;

determining signal characteristics, including a signal strength of the received radio frequency signal;

selecting an antenna from the first and second antennas as a function of the signal characteristics, wherein the selection maximizes the signal strength of the received radio frequency signal;

coupling the selected antenna to a first signal line communicating signals according to a first wireless protocol;

coupling the non-selected antenna to a second signal line communicating signals according to a second wireless protocol; and

after the radio frequency signal has been received, transmitting a further radio frequency signal using the selected antenna.

9. The method of claim 8, wherein the first and second antennas are antenna pairs.

10. The method of claim 8, wherein the radio signal and the further radio signal are IEEE 802.11 signals, the first wireless protocol is an IEEE 802.11 standard and the second wireless protocol is a Bluetooth protocol.

11. The method of claim 8, wherein the signal characteristics include at least one of (i) a signal strength and (ii) a signal to noise ratio.

12. The method of claim 8, wherein the selecting comprises:

selecting the one of the first and second antennas as a function of a greater of at least one of (i) the signal strength and (ii) the signal to noise ratio exhibited by the received radio frequency signal using the first and second antennas.

13. The method of claim 8, wherein the first and second antennas remain coupled to the first and second signal lines for a duration of a packet included in the radio frequency signal.

14. A method, comprising:

receiving a first radio frequency signal using first and second antennas;

determining signal characteristics, including a signal strength of the first radio frequency signal;

selecting one of the first and second antennas as a function of the signal characteristics, wherein the selection maximizes the signal strength of the first radio frequency signal;

coupling the selected antenna to a first signal line communicating signals according to a first wireless protocol;

coupling the non-selected antenna to a second signal line communicating signals according to a second wireless protocol;

after the first radio frequency signal has been received, transmitting a second radio frequency signal on the selected antenna; and

receiving, simultaneously with the transmitting, a third radio frequency signal on the non-selected antenna.

15. A device, comprising:

a first signal line communicating radio frequency signals according to a first wireless protocol;

a second signal line communicating radio frequency signals according to a second wireless protocol;

a first antenna receiving a radio frequency signal;

a second antenna receiving the radio frequency signal;

a microchip detecting signal characteristics, including signal strength, of the received radio frequency signal, the microchip generating a control signal as a function of the signal characteristics; and

a switch coupling the first signal line to one of the first and second antennas which is selected as a function of the control signal, the switch simultaneously coupling the second signal line to the other of the first and second antennas.

16. The device of claim 15, wherein the radio frequency signal is an IEEE 802.11 signal, the first wireless protocol is an IEEE 802.11 standard and the second wireless protocol is a Bluetooth protocol.

17. The device of claim 15, wherein the signal characteristics include at least one of (i) a signal strength and (ii) a signal to noise ratio.

18. The device of claim 15, wherein the microchip selects the one of the first and second antennas as a function of a greater of at least one of (i) the signal strength and (ii) the signal to noise ratio exhibited by the received radio frequency signal using the first and second antennas.

19. The method of claim 15, wherein the first and second antennas remain coupled to the first and second signal lines for a duration of a packet included in the radio frequency signal.

20. The device of claim 15, wherein the switch includes two single pole single throw (SPST) switches.

21. The device of claim 15, wherein the switch includes two single pole double throw (SPDT) switches.

22. The device of claim 21, wherein the two SPDT switches are arranged in parallel.

23. The device of claim 15, wherein the switch is a double pole double throw (DBDT) switch.

24. A device, comprising:

a microchip detecting signal characteristics, including a signal strength, of a radio frequency signal received using first and second antennas, the microchip generating a control signal as a function of the signal characteristics, the control signal maximizing the signal strength; and

a switch selectively coupling one of the first and second antennas to one of first and second signal lines as a function of the control signal, the switch simultaneously coupling the other of the non-selected antenna to the other of the first and second signal lines,

wherein a further radio frequency signal is communicated on the other of the first and second signal lines simultaneously with the receipt of the radio frequency signal; and

wherein the first signal line communicates IEEE 802.11 signals and the second signal line communicates Bluetooth signals.

25. The device of claim 24, wherein the switch is one of (i) two single pole single throw (SPST) switches, (ii) two single pole double throw (SPDT) switches and (iii) a double pole double throw (DBDT) switch.

26. The device of claim 24, wherein the signal characteristics include at least one of (i) a signal strength and (ii) a signal to noise ratio.

27. The device of claim 26, wherein the microchip selects the one of the first and second antennas as a function of a greater of at least one of (i) the signal strength and (ii) the signal to noise ratio exhibited by the received radio frequency signal using the first and second antennas.