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US 6,920,315 B1Granted
Multiple antenna impedance optimization
AssigneeEricsson Inc.
InventorsBruce Emerson Wilcox, Mark Gordon Douglas
Life of this patent
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Abstract
A multiple antenna mobile communication device, such as a cellular telephone, having multiple radios and multiple antennas located in close proximity to each other uses a parallel tuning circuit to optimize the isolation between the antennas. The parallel tuning circuit can include multiple impedance matching circuits to match the impedance in multiple frequency bands or isolating antennas.
Claims7
A method of adjusting impedance in a multiple antenna system, comprising:
- detecting whether a first signal source connected with a first antenna via a first signal path is active or inactive;
- detecting whether a second signal source connected with a second antenna via a second signal path is active or inactive, wherein the second antenna is disposed proximate to the first antenna to within approximately one wavelength or less;
- and
- selectively connecting a first parallel impedance circuit in parallel with the first signal path if the first signal source is inactive and the second signal source is active to reduce electromagnetic coupling between the second and first antennas.
1 more element
A method of adjusting impedance in a multiple antenna system comprising:
- detecting whether a first signal source operatively connected with a first antenna via a first signal path is active or inactive;
- detecting whether a second signal source simultaneously operatively connected with a second antenna via a second signal path is active or inactive;
- and
- selectively connecting a first parallel impedance circuit in parallel with the first signal if the first signal source is inactive and the second signal source is active to reduce electromagnetic coupling between the second and first antennas.
1 more element
Dependencies are inferred from the claim text.