Apparatus and method for determining beam index of antenna array

1. An electronic device, comprising:

a first antenna array including a plurality of first antenna elements;

a second antenna array including a plurality of second antenna elements; and

a processor, wherein the processor is configured to:

measure first signal strengths for every a plurality of beam indexes by means of the first antenna array and the second antenna array;

determine second signal strengths for every the plurality of beam indexes by means of the first antenna array;

when a difference between the first signal strength and the second signal strength corresponding to a beam index selected among the plurality of beam indexes is greater than or equal to a specified first threshold, determine a beam index, the first signal strength of which is maximal, among the plurality of beam indexes; and

when the difference between the first signal strength and the second signal strength is less than the first threshold, determine a beam index, the second signal strength of which is maximal, among the plurality of beam indexes.

2. The electronic device of claim 1 , wherein the signal strength includes a signal to noise ratio (SNR), a reference signals received power (RSRP), a received signal code power (RSCP), a BRSRP, or a received signal strength indicator (RSSI).

3. The electronic device of claim 1 , wherein the plurality of first antenna elements include a patch antenna, and

wherein the plurality of second antenna elements include a dipole antenna.

4. The electronic device of claim 3 , wherein the processor is configured to:

when the difference between the first signal strength and the second signal strength is less than the first threshold, identify whether all the plurality of beam indexes are selected; and

when all the plurality of beam indexes are selected, determine the beam index, the second signal strength of which is maximal, among the plurality of beam indexes.

5. The electronic device of claim 3 , wherein the processor is configured to:

when the difference between the first signal strength and the second signal strength is less than the first threshold, identify whether a difference between the second signal strength of the selected beam index and the second signal strength of a previous beam index is greater than or equal to a specified second threshold;

when the difference between the second signal strength of the selected beam index and the second signal strength of the previous beam index is greater than or equal to the second threshold, determine the beam index, the second signal strength of which is maximal, among the plurality of beam indexes; and

when the difference between the second signal strength of the selected beam index and the second signal strength of the previous beam index is less than the second threshold, determine the selected beam index as a beam index, a signal strength of which is maximal.

6. The electronic device of claim 3 , wherein the first antenna array includes antenna elements formed in a plurality of rows and antenna elements formed in a plurality of columns, and

wherein the processor is configured to:

when the difference between the first signal strength and the second signal strength is less than the first threshold, determine a first beam index group, a signal strength of which is maximal, among first beam index groups corresponding to antenna elements formed in row;

determine a second beam index group, a signal strength of which is maximal, among second beam index groups corresponding to antenna elements formed in column; and

determine a beam index, a signal strength of which is maximal, based on the determined first beam index group and the determined second beam index group.

7. The electronic device of claim 3 , wherein the first antenna array includes antenna elements formed in a plurality of rows and antenna elements formed in a plurality of columns, and

wherein the processor is configured to:

when the difference between the first signal strength and the second signal strength is less than the first threshold, select one of first beam index groups corresponding to antenna elements formed in row;

select one of second beam index groups corresponding to antenna elements formed in column; and

when a signal strength of the selected first beam index group is greater than or equal to a specified third threshold and when a signal strength of the selected second beam index group is greater than or equal to a specified fourth threshold, determine a beam index, a signal strength of which is maximal, based on the selected first beam index group and the selected second beam index group.

8. The electronic device of claim 3 , further comprising:

a third antenna array including a plurality of third antenna elements,

wherein the processor is configured to:

when the difference between the first signal strength and the second signal strength is less than the first threshold, select a beam index, a signal strength of which is maximal, in the first antenna array;

select a beam index, a signal strength of which is maximal, in the third antenna array; and

determine a beam index, a signal strength of which is maximal, between the beam index selected from the first antenna array and the beam index selected from the third antenna array.

9. An electronic device, comprising:

a housing;

an antenna structure including a first antenna array and a second antenna array; and

a wireless communication circuitry configured to be operatively connected with the first antenna array and the second antenna array and transmit or receive a signal having a frequency between 3 Gigahertz (GHz) and 100 GHz by forming a directional beam using at least a part of the first antenna array or the second antenna array,

wherein the wireless communication circuitry is configured to:

determine received signal strengths through a plurality of combinations of the first antenna array and the second antenna array;

select one of the combinations based on at least some of the received signal strengths;

determine a first received signal strength using the second antenna array, rather than the first antenna array, with respect to the selected combination;

determine a second received signal strength using the second antenna array, rather than the first antenna array, with respect to the selected combination; and

select one of the first antenna array and the second antenna array based on at least a portion of the first received signal strength and the second received signal strength.

10. The electronic device of claim 9 , wherein the first antenna array is located on a first plane, and

wherein the second antenna array is located on a second plane different from the first plane.

11. The electronic device of claim 10 , wherein the first antenna array includes a plurality of conductive plates, and

wherein the second antenna array includes a plurality of dipole antennas.

12. The electronic device of claim 11 , wherein the first antenna array is oriented to generate a beam in a first direction, and

wherein the second antenna array is oriented to generate a beam in a second direction different from the first direction.

13. The electronic device of claim 12 , wherein the first direction is substantially perpendicular to the second direction.

14. The electronic device of claim 9 , wherein the first received signal strength or the second received signal strength includes an SNR, an RSRP, an RSCP, a BRSRP, or an RSSI.

15. The electronic device of claim 13 , wherein the first antenna array includes antenna elements formed in a plurality of rows and antenna elements formed in a plurality of columns, and

wherein the wireless communication circuitry is configured to:

when a difference between the first received signal strength and the second received signal strength is less than a first threshold, determine a first beam index group, a signal strength of which is maximal, among first beam index groups corresponding to antenna elements formed in row;

determine a second beam index group, a signal strength of which is maximal, among second beam index groups corresponding to antenna elements formed in column; and

determine a beam index, a signal strength of which is maximal, based on the determined first beam index group and the determined second beam index group.