Impedance tuning of transmitting and receiving antennas

1. A device comprising:

a transceiver;

a receiving narrowband antenna;

a transmitting narrowband antenna;

a receiving branch coupled between the transceiver and the receiving narrowband antenna, the receiving branch including a receiving tuning circuit and a first filter, and wherein the receiving tuning circuit matches an impedance of the receiving narrowband antenna with an impedance of a receiving amplifier and further matches the impedance of the receiving narrowband antenna with an impedance of the first filter;

a transmitting branch coupled between the transceiver and the transmitting narrowband antenna, the transmitting branch including a transmitting tuning circuit and a second filter, wherein the transmitting tuning circuit matches an impedance of the transmitting narrowband antenna with an impedance of a transmitting amplifier and further matches the impedance of the transmitting narrowband antenna with an impedance of the second filter.

2. The device of claim 1 , wherein the receiving amplifier and the transmitting amplifier are included in the transceiver.

3. The device of claim 1 , wherein the receiving amplifier is included in the receiving branch and the transmitting amplifier is included in the transmitting branch.

4. The device of claim 1 , wherein the receiving narrowband antenna, the transmitting narrowband antenna, or a combination thereof, are a planar inverted F antenna (PIFA).

5. The device of claim 1 , wherein the transmitting narrowband antenna, the receiving narrowband antenna, or a combination thereof, have a building height less than or equal to 1 millimeter.

6. The device of claim 1 , wherein the receiving tuning circuit matches impedances of the receiving narrowband antenna with the impedance of a receiving amplifier across a plurality of frequency ranges, wherein each frequency range is associated with a receiving band of a different wireless communication technology.

7. The device of claim 1 , wherein the transmitting tuning circuit matches impedances of the transmitting narrowband antenna with the impedance of the transmitting amplifier across a plurality of frequency ranges, wherein each frequency range is associated with a transmitting band of a different wireless communication technology.

8. The device of claim 1 , wherein the receiving narrowband antenna includes one or more receiving tuning elements to match an impedance of the receiving narrowband antenna with the impedance of the receiving amplifier.

9. The device of claim 1 , wherein the transmitting narrowband antenna includes one or more transmitting tuning elements to match an impedance of the transmitting narrowband antenna with the impedance of the transmitting amplifier.

10. The device of claim 1 , wherein the transmitting tuning circuit matches impedances of the transmitting narrowband antenna with impedances of a plurality of filters across a plurality of frequency ranges.

11. The device of claim 1 , wherein the receiving tuning circuit matches impedances of the receiving narrowband antenna with impedances of a plurality of filters across a plurality of frequency ranges.

12. A method comprising:

determining, by a control unit of a wireless communication device, an impedance of a receiving narrowband antenna of the wireless communication device;

determining, by the control unit, an impedance of a receiving amplifier of the wireless communication device and an impedance of at least one receiving filter; and

sending a control signal from the control unit to a receiving tuning circuit to match the impedance of the receiving narrowband antenna with the impedance of the receiving amplifier and match the impedance of the receiving narrowband antenna with the impedance of the at least one receiving filter.

13. The method of claim 12 , wherein the impedance of the receiving narrowband antenna is based on a frequency of signals received via the receiving narrowband antenna.

14. The method of claim 12 , wherein the impedance of the receiving narrowband antenna is based on interaction between a user of the wireless communication device and the receiving narrowband antenna.

15. The method of claim 12 further comprising: determining, by the control unit, an impedance of a transmitting narrowband antenna of the wireless communication device; determining, by the control unit, an impedance of a transmitting amplifier of the wireless communication device; and providing a signal from the control unit to a transmitting tuning circuit to match the impedance of the transmitting narrowband antenna to the impedance of the transmitting amplifier.

16. The method of claim 15 , wherein a pass band of signals that are transmitted from the transmitting narrowband antenna does not overlap with a pass band of signals that are received via the receiving narrowband antenna.

17. The method of claim 12 , wherein the receiving tuning circuit is to match impedances of the receiving narrowband antenna with impedances of a plurality of filters across a plurality of frequency ranges.

18. The method of claim 12 , wherein the act of sending sends the control signal to a transmitting tuning circuit to match an impedance of a transmitting narrowband antenna with an impedance of a transmitting amplifier and match the impedance of the transmitting narrowband antenna with an impedance of the at least one transmitting filter.