Electronic device and method for controlling transmission power on basis of control information

1. An electronic device comprising:

an amplification circuit;

an antenna configured to be electrically connected to the amplification circuit;

a variable element configured to adjust an impedance between the amplification circuit and the antenna; and

a control circuit,

wherein the control circuit is configured to:

output a signal amplified by a designated gain using the amplification circuit to an external electronic device using the antenna, with the variable element adjusted to a first impedance;

detect that an external object is adjacent while outputting the signal;

identify a tuning code for changing the first impedance of the variable element to a second impedance upon detecting that the external object is adjacent;

adjust the designated gain based on a first power adjustment value when the tuning code belongs to a first group; and

refrain from adjusting the designated gain when the tuning code belongs to a second group.

2. The electronic device as claimed in claim 1 , further comprising a proximity sensor,

wherein the control circuit is configured to detect that the external object is adjacent using the proximity sensor.

3. The electronic device as claimed in claim 1 , wherein the control circuit is configured to:

determine that the tuning code belongs to the first group when a transmission power value of a signal output based on the second impedance is greater than a first transmission power value; and

determine that the tuning code belongs to the second group when the transmission power value of the signal output based on the second impedance is less than a second transmission power value, and

the first transmission power value is greater than the second transmission power value.

4. The electronic device as claimed in claim 3 , wherein the control circuit is configured to:

determine that the tuning code belongs to a third group when the transmission power value of the signal output based on the second impedance is less than the first transmission power value and is greater than the second transmission power value; and

adjust the designated gain based on a second power adjustment value when the tuning code belongs to the third group, and

the second power adjustment value is less than the first power adjustment value.

5. The electronic device as claimed in claim 1 , wherein the variable element comprises at least one variable capacitor and at least one variable inductor.

6. The electronic device as claimed in claim 1 , wherein the control circuit is configured to adjust the designated gain based at least on the tuning code when a frequency band of the signal is a designated frequency band.

7. The electronic device as claimed in claim 1 , further comprising a memory,

wherein the memory stores:

a first lookup table in which a plurality of power adjustment values corresponding to a plurality of frequency bands is stored;

a plurality of second lookup tables in which a plurality of tuning codes for adjusting an impedance of the variable element corresponding to a plurality of states of the electronic device is stored; and

a third lookup table in which the plurality of second lookup tables corresponding to the plurality of frequency bands is stored.

8. The electronic device as claimed in claim 7 , wherein the control circuit is configured to:

determine a power adjustment value corresponding to a frequency band of the signal by referring to the first lookup table;

determine a second lookup table corresponding to the frequency band by referring to the third lookup table; and

determine the tuning code corresponding to a state of the electronic device by referring to the second lookup table.

9. The electronic device as claimed in claim 7 , wherein the plurality of states of the electronic device comprises a state in which the electronic device is adjacent to the external object within a designated distance or less.

10. An operating method of an electronic device, the electronic device comprising an amplification circuit, an antenna configured to be electrically connected to the amplification circuit, and a variable element configured to adjust an impedance between the amplification circuit and the antenna, the method comprising:

outputting a signal amplified by a designated gain using the amplification circuit to an external electronic device using the antenna, with the variable element adjusted to a first impedance;

detecting that an external object is adjacent while outputting the signal;

identifying a tuning code for changing the first impedance of the variable element to a second impedance upon detecting that the external object is adjacent;

adjusting the designated gain based on a first power adjustment value when the tuning code belongs to a first group; and

refraining from adjusting the designated gain when the tuning code belongs to a second group.

11. The method as claimed in claim 10 , further comprising:

determining that the tuning code belongs to the first group when a transmission power value of a signal output based on the second impedance is greater than a first transmission power value; and

determining that the tuning code belongs to the second group when the transmission power value of the signal output based on the second impedance is less than a second transmission power value,

wherein the first transmission power value is greater than the second transmission power value.

12. The method as claimed in claim 11 , further comprising:

determining that the tuning code belongs to a third group when the transmission power value of the signal output based on the second impedance is less than the first transmission power value and is greater than the second transmission power value; and

adjusting the designated gain based on a second power adjustment value when the tuning code belongs to the third group, wherein the second power adjustment value is less than the first power adjustment value.

13. The method as claimed in claim 10 , further comprising adjusting the designated gain based at least on the tuning code when a frequency band of the signal is a designated frequency band.