Patent ID: 8008992

Claim:
A transformer, comprising: a first capacitor, electrically connected between a first port and a ground in series; a first inductor, electrically connected to the first port in series; a second capacitor, electrically connected between the first inductor and the ground in series; a second inductor, electrically connected between the first inductor and the second capacitor in series; a third capacitor, electrically connected between a second port and the ground in series; a third inductor, electrically connected to the second port in series; a fourth capacitor, electrically connected between a third port and the ground in series; a fourth inductor, electrically connected between the third inductor and the third port in series; and a first additional capacitor, having a predetermined capacitance value, wherein a first mutual inductor having a predetermined inductance value is generated by an interaction between the first inductor and the third inductor, and the first mutual inductor is electrically connected to the first additional capacitor in parallel.