Laminated notch filter and cellular phone using the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsToshio Ishizaki, Ikuo Awai, Hideyuki Miyake, Shoichi Kitazawa, Toru Yamada
Life of this patent
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Abstract
A notch filter made up from laminated dielectric, which attenuates a specific frequency of a signal to be transmitted, comprises two terminals for input or output a signal to be transmitted, a line connected between those terminals, two resonators each having one end connected to ground and an other end, two first coupling capacitors, and a second coupling capacitor. Each end of the line is connected to the other end of the resonator through the first capacitor. The second capacitor couples said two resonators each other.
Claims18
A laminated dielectric notch filter, which attenuates a frequency of a signal to be transmitted, the notch filter comprising:
- two terminals configured to input and output a signal to be transmitted;
- a line connected between the two terminals;
- two resonators positioned so as to have an electromagnetic coupling, each resonator having a first end connected to ground and a second end;
- two first coupling capacitors;
- and
- a second coupling capacitor,
- wherein each end of the line is connected to the second end of a corresponding one of the two resonators through a corresponding one of the two first coupling capacitors, and the second coupling capacitor couples the two resonators.
A laminated dielectric notch filter, which attenuates a frequency of a signal to be transmitted, the notch filter comprising:
- two terminals configured to input and output a signal to be transmitted;
- a line connected between the two terminals;
- two stepped impedance resonators each having a low impedance portion and a high impedance portion;
- and
- two coupling capacitors,
- wherein the stepped-impedance resonators anti-resonate at a frequency substantially the same as the attenuation frequency.
A laminated dielectric notch filter, which attenuates a frequency of a signal to be transmitted, the notch filter comprising:
- two terminals configured to input and output a signal to be transmitted;
- a line connected between the two terminals;
- two resonators positioned so as to have an electromagnetic coupling, each resonator having a first end connected to ground and a second end;
- and
- two first capacitors, each electrically connecting an end of the line to the second end of a corresponding one of the two resonators;
- wherein the notch filter is configured to anti-resonate at a frequency substantially the same as the attenuation frequency of the notch filter.
Dependencies are inferred from the claim text.