Electronic device for matching antenna impedance and operating method thereof

1. An electronic device comprising:

an antenna;

a wireless communication circuitry;

an impedance matching circuitry electrically connected to the antenna and the wireless communication circuitry; and

at least one processor operatively connected to the impedance matching circuitry and the wireless communication circuitry,

wherein the at least one processor is configured to:

select a first index corresponding to an impedance of the antenna among a plurality of sampled indexes through a first measurement in which a tuning code of the impedance matching circuitry is configured as a reference code,

identify a use environment corresponding to the first index,

select a second index corresponding to the impedance of the antenna among the plurality of sampled indexes through a second measurement in which the tuning code of the impedance matching circuitry is configured as the reference code and as a ground code corresponding to the use environment, and

adjust the impedance of the antenna based on the tuning code corresponding to the second index.

2. The electronic device of claim 1 , wherein the plurality of sampled indexes comprise 96 indexes each of which corresponds to different impedance.

3. The electronic device of claim 1 , wherein at least one adjacent index of the plurality of sampled indexes is grouped by use environments.

4. The electronic device of claim 1 , wherein the at least one processor is further configured to identify the impedance of the antenna through the first measurement and the second measurement in a same period.

5. The electronic device of claim 1 , wherein the at least one processor is further configured to adjust a length of a ground connected to the antenna based on the ground code corresponding to the use environment.

6. An electronic device comprising:

an antenna;

a wireless communication circuitry;

an impedance matching circuitry electrically connected to the antenna and the wireless communication circuitry; and

at least one processor operatively connected to the impedance matching circuitry and the wireless communication circuitry,

wherein the at least one processor is configured to:

select a first index corresponding to a first impedance of the antenna identified through a first measurement in which a tuning code of the impedance matching circuitry is configured as a reference code among a plurality of sampled indexes,

identify a use environment corresponding to the first index,

identify a second impedance of the antenna through a second measurement in which the tuning code of the impedance matching circuitry is configured as a tuning code corresponding to the first index and as a ground code corresponding to the use environment, and

adjust an impedance of the antenna based on the tuning code corresponding to the first index in case that a distance between the second impedance and a reference impedance satisfies a designated condition.

7. The electronic device of claim 6 , wherein the plurality of sampled indexes comprise 96 indexes each of which corresponds to different impedance, and at least one adjacent index of the plurality of sampled indexes is grouped by use environments.

8. The electronic device of claim 6 , wherein the at least one processor is configured to:

update the tuning code based on a result of the second measurement in which the tuning code of the impedance matching circuitry is configured as the reference code and as the ground code corresponding to the use environment in case that the distance between the second impedance and the reference impedance does not satisfy the designated condition, and

adjust the impedance of the antenna based on the updated tuning code.

9. The electronic device of claim 6 , wherein the at least one processor is further configured to adjust a length of a ground connected to the antenna based on the ground code corresponding to the use environment.

10. The electronic device of claim 6 , wherein the reference impedance comprises at least one of inphase (I)/quadrature (Q) information corresponding to 50 ohms or I/Q information including a highest transmission power.

11. A method for operating an electronic device comprising:

selecting a first index corresponding to an impedance of an antenna among a plurality of sampled indexes through a first measurement in which a tuning code for impedance matching of the antenna is configured as a reference code;

identifying a use environment corresponding to the first index;

selecting a second index corresponding to the impedance of the antenna among the plurality of sampled indexes through a second measurement in which the tuning code for the impedance matching of the antenna is configured as the reference code and as a ground code corresponding to the use environment; and

adjusting the impedance of the antenna based on the tuning code corresponding to the second index.

12. The method of claim 11 , wherein the plurality of sampled indexes comprise 96 indexes each of which corresponds to different impedance.

13. The method of claim 11 , wherein at least one adjacent index of the plurality of sampled indexes is grouped by use environments.

14. The method of claim 11 , wherein the first measurement and the second measurement are performed to identify the impedance of the antenna in a same period.

15. The method of claim 11 , further comprising adjusting a length of a ground connected to the antenna based on the ground code corresponding to the use environment.

16. A method for operating an electronic device comprising:

selecting a first index corresponding to a first impedance of an antenna identified through a first measurement in which a tuning code for impedance matching of the antenna is configured as a reference code among a plurality of sampled indexes;

identifying a use environment corresponding to the first index;

identifying a second impedance of the antenna through a second measurement in which the tuning code for the impedance matching of the antenna is configured as a tuning code corresponding to the first index and as a ground code corresponding to the use environment; and

adjusting the impedance of the antenna based on the tuning code corresponding to the first index in case that a distance between the second impedance and a reference impedance satisfies a designated condition.

17. The method of claim 16 , wherein the plurality of sampled indexes comprise 96 indexes each of which corresponds to different impedance, and at least one adjacent index of the plurality of sampled indexes is grouped by use environments.

18. The method of claim 16 , further comprising:

updating the tuning code based on a result of the second measurement in which the tuning code of the impedance matching of the antenna is configured as the reference code and as the ground code corresponding to the use environment in case that the distance between the second impedance and the reference impedance does not satisfy the designated condition; and

adjusting the impedance of the antenna based on the updated tuning code.

19. The method of claim 16 , further comprising adjusting a length of a ground connected to the antenna based on the ground code corresponding to the use environment.

20. The method of claim 16 , wherein the reference impedance comprises at least one of inphase (I)/quadrature (Q) information corresponding to 50 ohms or I/Q information including a highest transmission power.