Antenna device, manufacturing method therefor, and electronic device having antenna device

A method of manufacturing an antenna device, the method comprising:

• forming respective conductive thin films on both surfaces of an insulating substrate;
• forming a mask pattern on the conductive thin film formed on either side of the insulating substrate;
• forming first and second antenna patterns by simultaneously wet-etching the conductive thin films formed on both the surfaces of the insulating substrate, by masking the conductive thin films with the mask patterns;
• removing the mask patterns;
• and
• connecting the first and second antenna patterns with a conductive member.