Design of 120 GHz Balun for 5G Transceiver Chips

5G is the wireless technology in which millimeter waves are used for communication between the devices. Balun is a passive device necessary for efficient power transfer from one building block of the transceiver to the other. In this paper an unbalance to balance power conversion is achieved using balun at 120 GHz. The designed balun has about 1 dB amplitude error for bandwidth from 85 GHz to 150 GHz whereas the phase error is observed +/-5°. The overall form factor of the designed balun is 2.9 nm
²
which is the least possible size for balun design at this frequency range.