Band-pass filter
AssigneeTDK Corporation
InventorYuki Matsumoto
Life of this patent
Estimating the term…
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.
Claims16
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;
- a first low-pass filter provided between the second high-pass filter and the third high-pass filter in the circuit configuration;
- and
- a stack including a plurality of dielectric layers stacked together, wherein
- 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,
- the first port, the second port, the first high-pass filter, the second high-pass filter, the third high-pass filter, and the first low-pass filter are integrated into the stack,
- the first high-pass filter includes a first inductor wound around a first axis,
- the second high-pass filter includes a second inductor wound around a second axis, and
- the third high-pass filter includes a third inductor wound around a third axis.
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,
- 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, and
- wherein no low-pass filter is provided between the first high-pass filter and the second high-pass filter in the circuit configuration.
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;
- a first low-pass filter provided between the second high-pass filter and the third high-pass filter in the circuit configuration;
- and
- a stack including a plurality of dielectric layers stacked together, wherein
- 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,
- the first port, the second port, the first high-pass filter, the second high-pass filter, the third high-pass filter, and the first low-pass filter are integrated into the stack, and
- the third high-pass filter is not adjacent to the first high-pass filter in the stack.
Dependencies are inferred from the claim text.