Patent ID: 8502623

Claim:
A band pass filter, comprising: a first serial inductor; a first serial capacitor, with one end electrically connected to one end of the first serial inductor; a second serial capacitor, with one end electrically connected to the other end of the first serial capacitor; a second serial inductor, with one end electrically connected to the other end of the second serial capacitor; a first branch capacitor, with one end electrically connected to the one end of the first serial inductor, and the other end electrically connected to ground; a second branch capacitor, with one end electrically connected to the other end of the second serial capacitor, and the other end electrically connected to ground; a central capacitor, with one end electrically connected to the other end of the first serial capacitor, and the other end electrically connected to ground; and a central inductor, with one end electrically connected to the other end of the first serial capacitor, and the other end electrically connected to ground, wherein the above elements form an original circuit, and an interaction of at least two of the above elements produces a mutual capacitor or a mutual inductor, which constitutes a resonance circuit with the original circuit to produce at least a transmission zero, the mutual capacitor is produced from an interaction between the first serial capacitor and the second serial capacitor.