Antenna optimization method in multiple connection environment and electronic device using same

An electronic device comprising:

• at least one antenna configured to transmit and receive a wireless signal;
• a tuner;
• at least one processor;
• and
• at least one memory,
• wherein the at least one memory stores instructions, when executed by the at least one processor, causing the electronic device to:
• determine whether multiple frequency band connections are configured,
• identify a frequency band to transmit control information among the connected multiple frequency bands, when the multiple frequency band connections are configured, based on a result of determination,
• acquire communication state information of the identified frequency band for transmitting the control information,
• determine an antenna mode, based on the acquired communication state information, and
• configure the at least one antenna, based on the determined antenna mode,
• wherein the antenna mode includes:
• a first mode in which the tuner is set based on return losses of the multiple frequency bands, and a second mode in which the tuner is set based on return losses of frequency bands among the multiple frequency bands to which the control information is transmitted, and
• wherein in the second mode, a return loss of the frequency band over which the control information is transmitted is reduced compared to the first mode.