Electronic device having a dual autodiplexing antenna

• US 8,073,514 B2
• Filed: 06/23/2008
• Issued: 12/06/2011
• Est. Priority Date: 06/30/2006
• Status: Active Grant

• Current Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Original Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Inventors: Black, Greg R., Asrani, Vijay L., Napoles, Adrian
• Primary Examiner(s): Cumming, William D
• Application Number:
  US12/144,455
• Publication Number:
  US 20080268926A1
• Time in Patent Office: 1,261 Days
• Field of Search: 455/575.7, 370/297, 343/702, 343/753, 324/639, 438/29
• US Class Current: 455/575.7
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 3/24 varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching

Abstract

A dual autodiplexing antenna (300) redirects power flow (303) from an unloaded antenna to a loaded antenna, thereby improving communication performance under loaded conditions. The dual autodiplexing antenna (300) includes a first antenna (101) disposed at a first end (103) of a portable two-way communication device (100). A second antenna (102) is disposed at the distal end (104) of the portable two-way communication device (100). The first antenna (101) and second antenna (102) are coupled to a transceiver (107) by a first transmission line matching circuit (201) and a second transmission line matching circuit (202), respectively. In one embodiment, the first antenna (101) is configured to primarily operate in a first bandwidth, while the second antenna (102) is configured to primarily operate in a second bandwidth. When one of the first antenna (101) or second antenna (102) is loaded, power flow (303) is redirected to the lesser loaded antenna.

Claims

1. An electronic device, comprising:

a. a transceiver;

b. a first transmission line coupled to the transceiver;

c. a first antenna characterized for operation in at least a first bandwidth coupled to the first transmission line, the first antenna having at least a first impedance in an unloaded state and a second impedance in a loaded state;

d. a second transmission line coupled to the transceiver; and

e. a second antenna characterized for operation at least in a second bandwidth coupled to the second transmission line;

wherein when the first antenna transitions from the unloaded state to the loaded state, power to the second antenna increases.

2. The electronic device of claim 1, wherein the first antenna is in a fully loaded state when an impedance associated with the first antenna is maximized.

3. The electronic device of claim 2, wherein the first antenna is in the fully loaded state when one of a hand, head, and combinations thereof is proximally located with the first antenna.

4. The electronic device of claim 1, wherein an insertion phase of the first transmission line is selected to maximize an input impedance associated with the first transmission line when the first is in a fully loaded state.

5. The electronic device of claim 1, where an insertion phase of the first transmission line is selected such that a return loss phase of the first antenna is within a multiple of 2π

radians plus or minus π

/4 radians when the first transmission line is in a fully loaded state.

6. The electronic device of claim 1, wherein an insertion phase of the first transmission line is selected to minimize a reactive component of power delivered from the transceiver when the first transmission line is in a fully loaded state.