Band-pass filter
AssigneeTDK Corporation
InventorYuki MATSUMOTO
Life of this patent
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Abstract
A band-pass filter includes a first port, a second port, first to third high-pass filters provided between the first port and the second port in this order from a first-port side in a circuit configuration, and a low-pass filter provided between the second high-pass filter and the third high-pass filter in the circuit configuration. Each of the first to third high-pass filters forms an attenuation pole on a low-pass side of the passband. A frequency of the attenuation pole formed by the second high-pass filter is higher than a frequency of the attenuation pole formed by each of the first and third high-pass filters.
Claims15
A band-pass filter that selectively passes a signal of a frequency in a predetermined passband, the band-pass filter comprising:
- a first port;
- a second port;
- a first high-pass filter, a second high-pass filter, and a third high-pass filter provided between the first port and the second port in this order from a first-port side in a circuit configuration;
- and
- a first low-pass filter provided between the second high-pass filter and the third high-pass filter in the circuit configuration, wherein
- each of the first to third high-pass filters forms an attenuation pole on a low-pass side of the passband, and
- a frequency of the attenuation pole formed by the second high-pass filter is higher than a frequency of the attenuation pole formed by each of the first and third high-pass filters.
Dependencies are inferred from the claim text.