Electronic device with antennas isolated using phase shifter
First Claim
1. An electronic device, comprising:
- a first antenna;
a second antenna;
radio-frequency transceiver circuitry coupled to the first and second antennas by respective first and second transmission lines;
a phase shifter interposed in the second transmission line;
control circuitry configured to adjust the phase shifter in response to transmission of signals in a communications band of interest with the first antenna; and
an electronic device housing, wherein the first and second antenna share a common ground plane that is formed from the electronic device housing, and the first and second antennas are surrounded on all but a single side by the common ground plane.
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Accused Products
Abstract
An electronic device may be provided with a primary antenna that is used for transmitting and receiving signals and a secondary antenna that is used for receiving signals. The primary and secondary antennas may be used together in a diversity arrangement when receiving signals. The electronic device may have a transceiver. A phase shifter may be interposed between the transceiver and the secondary antenna. Control circuitry may select a communications band of interest for transmitting signals with the primary antenna. The control circuitry can adjust the phase shifter in real time based on which communications band of interest has been selected for transmission with the primary antenna. The phase shifter may impose a phase shift on signals carried between the secondary antenna and the transceiver that ensures that primary antenna efficiency degradation associated with the presence of the secondary antenna in the vicinity of the primary antenna is avoided.
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Citations
19 Claims
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1. An electronic device, comprising:
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a first antenna; a second antenna; radio-frequency transceiver circuitry coupled to the first and second antennas by respective first and second transmission lines; a phase shifter interposed in the second transmission line; control circuitry configured to adjust the phase shifter in response to transmission of signals in a communications band of interest with the first antenna; and an electronic device housing, wherein the first and second antenna share a common ground plane that is formed from the electronic device housing, and the first and second antennas are surrounded on all but a single side by the common ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating an electric device having primary and secondary antennas, comprising:
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selecting a communications band of interest for transmitting radio-frequency signals with the primary antenna; adjusting a phase shifter to maintain a desired antenna efficiency when transmitting the radio-frequency signals in the communications band of interest, wherein the phase shifter is interposed in a transmission line path that couples the secondary antenna to a radio-frequency transceiver having a plurality of receiver ports; and controlling switching circuitry interposed between the phase shifter and the radio-frequency transceiver to couple the phase shifter to a selected receiver port of the plurality of receiver ports, wherein the radio-frequency transceiver is mounted to a printed circuit board and the phase shifter is mounted to a flexible printed circuit board that is coupled to the printed circuit board. - View Dependent Claims (10, 11, 12, 13, 18, 19)
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14. An electronic device, comprising:
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a first antenna; a second antenna; a radio-frequency receiver; a variable phase shifter; control circuitry that adjusts the variable phase shifter when transmitting signals with the first antenna to avoid antenna efficiency degradation for the first antenna due to presence of the second antenna; a housing in which the first and second antennas are mounted, wherein the first and second antennas comprise patterned metal on a flexible printed circuit; a display in the housing that is covered by a display cover layer, wherein the flexible printed circuit is overlapped by a portion of the display cover layer and radio-frequency signals for the first and second antennas pass through the display cover layer; and a printed circuit board coupled to the flexible printed circuit, wherein the radio-frequency receiver is mounted to the printed circuit board and the variable phase shifter is mounted to the flexible printed circuit. - View Dependent Claims (15, 16, 17)
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Specification