Transformer

A transformer having a structure in which first and second substrates are vertically laminated, the transformer comprising:

• a plurality of input conductive lines disposed on the first substrate along a circumference thereof and each having both ends provided as input terminals of positive (+) and negative (−) signals, respectively;
• a single output conductive line disposed co-planarly with the plurality of input conductive lines, formed in a vicinity of at least one of the plurality of input conductive lines to thereby be electromagnetically coupled to the at least one input conductive line, and having one end connected to a ground;
• and
• an air bridge including a pair of conductive via holes formed in anyone conductive line in an overlapped area in which the input and output conductive lines are intersected with each other to penetrate through the first substrate and a single piece of conductive line connecting the pair of conductive via holes to each other and disposed on the second substrate, thereby preventing a short-circuit between the input and output conductive lines.