Filter circuit and communication device
AssigneeKabushiki Kaisha Toshiba
InventorTamio KAWAGUCHI
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a filter circuit includes first and second terminals, and a filter element. The filter element includes a transmission line coupled with the first and second terminals, and first and second resonant elements coupled with the transmission line. The first and second resonant elements resonate at a frequency in a first band being of an object. The first resonant element is coupled to a position between the input portion and the intermediate portion. The second resonant element is coupled to a position between the intermediate portion and the output portion. The intermediate portion includes first to third portions. A line width of the second portion is different from a line width of the first portion and a line width of the third portion.
Claims20
A filter circuit, comprising:
- a first terminal;
- a second terminal;
- and
- a filter element,
- the filter element including:
- a transmission line configured to be coupled with the first terminal and the second terminal, and
- a first resonant element and a second resonant element configured to be coupled with the transmission line,
- the first resonant element and the second resonant element being configured to resonate at a frequency in a first band being of an object,
- the transmission line including:
- an input portion configured to be coupled with the first terminal,
- an output portion configured to be coupled with the second terminal, and
- an intermediate portion between the input portion and output portion,
- the first resonant element being configured to be coupled to a first position between the input portion and the intermediate portion,
- the second resonant element being configured to be coupled to a second position between the intermediate portion and the output portion,
- the intermediate portion including:
- a first portion,
- a second portion between the first portion and the output portion, and
- a third portion between the second portion and the output portion,
- a second line width of the second portion being different from a first line width of the first portion, and
- the second line width being different from a third line width of the third portion.
A filter circuit, comprising:
- a first terminal;
- a second terminal;
- and
- a filter element,
- the filter element including:
- a transmission line configured to be coupled with the first terminal and the second terminal, and
- a first resonant element and a second resonant element configured to be coupled with the transmission line,
- the first resonant element and the second resonant element being configured to resonate at a frequency in a first band being of an object,
- the transmission line including:
- an input portion configured to be coupled with the first terminal;
- an output portion configured to be coupled with the second termina;
- and,
- an intermediate portion between the input portion and the output portion,
- the first resonant element being configured to be coupled to a first position between the input portion and the intermediate portion,
- the second resonant element configured to be coupled to a second position between the intermediate portion and the output portion,
- the intermediate portion including:
- a first portion;
- a second portion between the first portion and the output portion;
- and
- a third portion between the second portion and the output portion,
- a second characteristic impedance of the second portion being different from a first characteristic impedance of the first portion, and
- the second characteristic impedance being different from a third characteristic impedance of the third portion.
Dependencies are inferred from the claim text.