Antenna tuner

1. An apparatus comprising:

a substrate;

an antenna array disposed on or in the substrate, the antenna array comprising at least two antennas;

a radio-frequency integrated circuit disposed on the substrate, the radio-frequency integrated circuit comprising at least two amplification circuits; and

at least two antenna tuners respectively coupled between the at least two antennas and the at least two amplification circuits, each antenna tuner of the at least two antenna tuners comprising:

an inductive component disposed on or in the substrate, the inductive component being separate from the radio-frequency integrated circuit; and

a capacitive component implemented within the radio-frequency integrated circuit.

2. The apparatus of claim 1 , wherein:

the inductive component is configured to provide a positive reactance; and

the capacitive component is configured to provide a negative reactance.

3. The apparatus of claim 1 , wherein the capacitive component is connected in parallel with the inductive component.

4. The apparatus of claim 1 , wherein the capacitive component comprises a varactor.

5. The apparatus of claim 4 , wherein each antenna tuner of the at least two antenna tuners is configured to change a negative reactance of the varactor.

6. The apparatus of claim 4 , wherein the inductive component comprises a transmission line.

7. The apparatus of claim 1 , wherein each antenna tuner of the at least two antenna tuners is configured to selectively:

match an output impedance of a corresponding amplification circuit of the at least two amplification circuits to an input impedance of a corresponding antenna of the at least two antennas; and

match an output impedance of the corresponding antenna to an input impedance of the corresponding amplification circuit.

8. The apparatus of claim 1 , wherein:

each antenna of the at least two antennas is configured to:

transmit a first radio-frequency signal with a first signal characteristic; and

transmit a second radio-frequency signal with a second signal characteristic that is different from the first signal characteristic; and

each antenna tuner of the at least two antenna tuners is configured to:

provide a first impedance based on a corresponding antenna of the at least two antennas transmitting the first radio-frequency signal, the first impedance based on a positive reactance of the inductive component and a negative reactance of the capacitive component;

change, prior to the second radio-frequency signal being transmitted, at least one of:

the positive reactance of the inductive component; or

the negative reactance of the capacitive component; and

provide a second impedance based on the corresponding antenna transmitting the second radio-frequency signal, the second impedance different from the first impedance.

9. The apparatus of claim 8 , wherein:

the first signal characteristic comprises a first phase; and

the second signal characteristic comprises a second phase that is different from the first phase.

10. The apparatus of claim 8 , wherein:

the first signal characteristic comprises a first frequency; and

the second signal characteristic comprises a second frequency that is different from the first frequency.

11. The apparatus of claim 8 , wherein the first radio-frequency signal and the second radio-frequency signal each comprise at least one frequency that is greater than or equal to twenty-four gigahertz.

12. The apparatus of claim 1 , wherein:

the inductive component comprises a first inductive component;

the capacitive component comprises a first capacitive component; and

each antenna tuner of the at least two antenna tuners comprises:

a second inductive component disposed on or in the substrate, the second inductive component being separate from the radio-frequency integrated circuit;

a second capacitive component implemented within the radio-frequency integrated circuit; and

a third capacitive component implemented within the radio-frequency integrated circuit.

13. The apparatus of claim 12 , wherein:

each antenna tuner of the at least two antenna tuners comprises:

an antenna node coupled to a corresponding antenna of the at least two antennas;

a shared node; and

a transceiver node coupled to a corresponding amplification circuit of the at least two amplification circuits;

the first inductive component is coupled between the antenna node and the shared node;

the second inductive component is coupled between the shared node and the transceiver node;

the first capacitive component is coupled between the antenna node and the shared node;

the second capacitive component is coupled between the shared node and the transceiver node; and

the third capacitive component is coupled between the shared node and a ground.

14. The apparatus of claim 1 , further comprising:

a mixer implemented within the radio-frequency integrated circuit;

a first phase shifter implemented within the radio-frequency integrated circuit, the first phase shifter coupled between the mixer and a first amplification circuit of the at least two amplification circuits; and

a second phase shifter implemented within the radio-frequency integrated circuit, the second phase shifter coupled between the mixer and a second amplification circuit of the at least two amplification circuits.

15. The apparatus of claim 1 , wherein each amplification circuit of the at least two amplification circuits comprises at least one of:

a power amplifier configured to amplify radio-frequency signals for transmission; or

a low-noise amplifier configured to amplify other radio-frequency signals for reception.

16. The apparatus of claim 1 , further comprising:

an antenna module,

wherein the substrate, the at least two antennas, the radio-frequency integrated circuit, and the at least two antenna tuners are packaged together as part of the antenna module.

17. The apparatus of claim 16 , further comprising:

a display screen; and

a processor operatively coupled to the display screen and the antenna module, the processor configured to present one or more graphical images on the display screen based on radio-frequency signals communicated by the antenna module.

18. The apparatus of claim 17 , wherein the apparatus comprises a mobile device.

19. An apparatus comprising:

a substrate;

first antenna means for transmitting and receiving radio-frequency signals, the first antenna means disposed on or in the substrate;

second antenna means for transmitting and receiving other radio-frequency signals, the second antenna means disposed on or in the substrate;

an integrated circuit disposed on the substrate and including:

first means for amplifying radio-frequency signals; and

second means for amplifying other radio-frequency signals;

first antenna-tuning means for providing impedance matching between the first antenna means and the first means for amplifying;

second antenna-tuning means for providing impedance matching between the second antenna means and the second means for amplifying,

wherein the first and second antenna-tuning means each comprise:

inductive means for providing a positive reactance, the inductive means disposed on or in the substrate, the inductive means being separate from the integrated circuit; and

capacitive means for providing a negative reactance, the capacitive means implemented as part of the integrated circuit.

20. The apparatus of claim 19 , wherein the capacitive means is coupled in parallel with the inductive means.

21. The apparatus of claim 19 , wherein the capacitive means is further configured to selectively provide a first negative reactance and a second negative reactance.

22. The apparatus of claim 19 , wherein the inductive means is further configured to selectively provide a first positive reactance and a second positive reactance.

23. The apparatus of claim 19 , wherein:

the first and second antenna means are each configured to:

transmit a first radio-frequency signal of the radio-frequency signals with a first signal characteristic; and

transmit a second radio-frequency signal of the radio-frequency signals with a second signal characteristic that is different from the first signal characteristic; and

the first and second antenna-tuning means are each configured to:

provide a first impedance based on a corresponding antenna means transmitting the first radio-frequency signal, the first impedance based on the positive reactance of the inductive means and the negative reactance of the capacitive means;

change, prior to the second radio-frequency signal being transmitted, at least one of:

the positive reactance of the inductive means; or

the negative reactance of the capacitive means; and

provide a second impedance based on the corresponding antenna means transmitting the second radio-frequency signal, the second impedance being different from the first impedance.

24. A method for operating a first antenna tuner and a second antenna tuner, the method comprising:

providing, via the first antenna tuner, a first impedance between a first amplification circuit of a radio-frequency integrated circuit and a first antenna disposed on or in a substrate, the first impedance based on a positive reactance of a first inductive component of the first antenna tuner and a negative reactance of a first capacitive component of the first antenna tuner, the first inductive component disposed on or in the substrate, the first inductive component being separate from the radio-frequency integrated circuit, the first capacitive component implemented within the radio-frequency integrated circuit, the radio-frequency integrated circuit disposed on the substrate;

passing, via the first antenna tuner having the first impedance, a first radio-frequency signal from the first amplification circuit to the first antenna;

transmitting, via the first antenna, the first radio-frequency signal;

providing, via the second antenna tuner, a second impedance between a second amplification circuit of the radio-frequency integrated circuit and a second antenna disposed on or in the substrate, the second impedance based on a positive reactance of a second inductive component of the second antenna tuner and a negative reactance of a second capacitive component of the second antenna tuner, the second inductive component disposed on or in the substrate, the second inductive component being separate from the radio-frequency integrated circuit, the second capacitive component implemented within the radio-frequency integrated circuit;

passing, via the second antenna tuner having the second impedance, a second radio-frequency signal from the second amplification circuit to the second antenna; and

transmitting, via the second antenna, the second radio-frequency signal.

25. The method of claim 24 , further comprising:

changing at least one of the positive reactance of the first inductive component or the negative reactance of the first capacitive component;

responsive to the changing, providing, via the first antenna tuner, a third impedance between the first amplification circuit and the first antenna, the third impedance being different from the first impedance;

passing, via the first antenna tuner having the third impedance, a third radio-frequency signal from the first amplification circuit to the first antenna; and

transmitting, via the first antenna, the third radio-frequency signal.

26. The method of claim 25 , wherein:

the providing of the first impedance comprises matching an output impedance of the first amplification circuit to a first input impedance of the first antenna; and

the providing of the third impedance comprises matching the output impedance of the first amplification circuit to a second input impedance of the first antenna, the second input impedance of the first antenna being different from the first input impedance.

27. The method of claim 25 , wherein the third radio-frequency signal has a different phase than the first radio-frequency signal.

28. The method of claim 25 , wherein the third radio-frequency signal has a different frequency than the first radio-frequency signal.

29. The method of claim 24 , wherein the capacitive component is connected in parallel with the inductive component.

30. The method of claim 24 , wherein:

the capacitive component comprises a varactor; and

the inductive component comprises a transmission line.