Common mode choke coil and electronic apparatus
AssigneeMurata Manufacturing Co., Ltd.
InventorsNoriyuki Ueki, Noboru Kato
Life of this patent
Estimating the term…
Abstract
A common mode choke coil includes a differential transmission line including first and second signal lines, a main circuit including a first coil provided in the first signal line, and a second coil provided in the second signal line and connected to the first coil by magnetic field coupling, and a parallel resonance circuit including a third coil connected to both the first and second coils by magnetic field coupling, and a first capacitor electrically connected in parallel to the third coil. In the common mode choke coil, a first resonant frequency of the main circuit is equal or substantially equal to a second resonant frequency of the parallel resonance circuit.
Claims20
A common mode choke coil comprising:
- a differential transmission line including a first signal line and a second signal line;
- a main circuit including a first coil provided in the first signal line, and a second coil provided in the second signal line and connected to the first coil by magnetic field coupling;
- and
- a parallel resonance circuit including a third coil connected to both the first coil and the second coil by magnetic field coupling, and a first capacitor electrically connected in parallel to the third coil;
- wherein
- a first resonant frequency of the main circuit is equal or substantially equal to a second resonant frequency of the parallel resonance circuit.
An electronic apparatus comprising:
- an electric circuit;
- and
- a common mode choke coil;
- wherein
- the common mode choke coil includes:
- a differential transmission line including a first signal line and a second signal line that are electrically connected to the electric circuit;
- a main circuit including a first coil provided in the first signal line, and a second coil provided in the second signal line and connected to the first coil by magnetic field coupling;
- and
- a parallel resonance circuit including a third coil connected to both the first coil and the second coil by magnetic field coupling, and a first capacitor electrically connected in parallel to the third coil;
- wherein
- a first resonant frequency of the main circuit is equal or substantially equal to a second resonant frequency of the parallel resonance circuit.
Dependencies are inferred from the claim text.