A portable communication device comprising: a printed circuit board ; an antenna disposed on the printed circuit board; a first feeding unit connected to a first part of the antenna; a second feeding unit connected to a second part of the antenna that is different from the first part of the antenna; a first communication circuit comprising a first transmission circuit and a first reception circuit ; a second communication circuit comprising a second transmission circuit and a second reception circuit ; a first switch circuit for connecting the first feeding unit with one of the first transmission circuit or the first reception circuit ; a second switch circuit for connecting the second feeding unit with one of the second transmission circuit or the second reception circuit ; and a processor ; and a memory operatively connected to the processor , wherein the memory is configured to store instructions that, when executed, cause the processor to perform a first operation by: controlling the first switch circuit to connect the first transmission circuit with the first feeding unit to transmit a signal via the first part of the antenna; controlling the second switch circuit to connect the second reception circuit with the second feeding unit ; receiving a signal, corresponding to the signal being transmitted via the first part of the antenna, via the second part of the antenna ; and checking the performance of the portable communication device based on the received signal. a printed circuit board ; an antenna disposed on the printed circuit board; a first feeding unit connected to a first part of the antenna; a second feeding unit connected to a second part of the antenna that is different from the first part of the antenna; a first communication circuit comprising a first transmission circuit and a first reception circuit ; a second communication circuit comprising a second transmission circuit and a second reception circuit ; a first switch circuit for connecting the first feeding unit with one of the first transmission circuit or the first reception circuit ; a second switch circuit for connecting the second feeding unit with one of the second transmission circuit or the second reception circuit ; and a processor ; and a memory operatively connected to the processor , wherein the memory is configured to store instructions that, when executed, cause the processor to perform a first operation by: controlling the first switch circuit to connect the first transmission circuit with the first feeding unit to transmit a signal via the first part of the antenna; controlling the second switch circuit to connect the second reception circuit with the second feeding unit ; receiving a signal, corresponding to the signal being transmitted via the first part of the antenna, via the second part of the antenna ; and checking the performance of the portable communication device based on the received signal. controlling the first switch circuit to connect the first transmission circuit with the first feeding unit to transmit a signal via the first part of the antenna; controlling the second switch circuit to connect the second reception circuit with the second feeding unit ; receiving a signal, corresponding to the signal being transmitted via the first part of the antenna, via the second part of the antenna ; and checking the performance of the portable communication device based on the received signal. <EOS>