Abstract: A filter which stops the propagation of an electromagnetic wave of a predetermined frequency band in a signal line or a power supply line is provided. This filter is a conductor connected to the signal line or the power supply line. This conductor is configured to include a linear portion. The first portion of the linear portion with an end portion connected to the signal line or the power supply line has the first width, and the second portion different from the first portion of the linear portion has the second width different from the first width.

Abstract: A communication device includes transmitting means for transmitting a signal in one or more frequency bands of a frequency channel including a plurality of frequency bands, identifying means for identifying occupancy of the plurality of frequency bands, and control means for controlling transmission power for transmitting the signal from the transmitting means, on the basis of an identification result obtained by the identifying means.

Abstract: A communication device includes transmitting means for transmitting a signal in one or more frequency bands of a frequency channel including a plurality of frequency bands, identifying means for identifying occupancy of the plurality of frequency bands, and control means for controlling transmission power for transmitting the signal from the transmitting means, on the basis of an identification result obtained by the identifying means.

Abstract: There is provided a branch circuit that comprises a first conductor and a second conductor as at least two branches from a predetermined branch point, a first stub connected to the first conductor at a first point, and a second stub connected to the second conductor at a second point, wherein the first point is a point where a length of a portion between the predetermined branch point and the first point of the first conductor is set to a first length determined in accordance with a characteristic of the first stub, and the second point is a point where a length of a portion between the predetermined branch point and the second point of the second conductor is set to a second length determined in accordance with a characteristic of the second stub and is different from the first length.

Abstract: A filter which stops the propagation of an electromagnetic wave of a predetermined frequency band in a signal line or a power supply line is provided. This filter is a conductor connected to the signal line or the power supply line. This conductor is configured to include a linear portion. The first portion of the linear portion with an end portion connected to the signal line or the power supply line has the first width, and the second portion different from the first portion of the linear portion has the second width different from the first width.

Abstract: A filter which stops the propagation of an electromagnetic wave of a predetermined frequency band in a signal line or a power supply line is provided. This filter is a conductor connected to the signal line or the power supply line. This conductor is configured to include a linear portion. The first portion of the linear portion with an end portion connected to the signal line or the power supply line has the first width, and the second portion different from the first portion of the linear portion has the second width different from the first width.

Abstract: A wireless communication apparatus 20 includes: a first communication unit configured to perform wireless communication that supports a plurality of wireless communication systems with different using frequency bands; a second communication unit configured to perform wired communication that supports a plurality of wired communication systems each with a different basic frequency used in data communication; and a switching unit configured to switch a wired communication system used in the wired communication by the second communication unit so that the basic frequency falls outside a predetermined frequency band including the using frequency bands of the wireless communication by the first communication unit.

Abstract: A communication device includes transmitting means for transmitting a signal in one or more frequency bands of a frequency channel including a plurality of frequency bands, identifying means for identifying occupancy of the plurality of frequency bands, and control means for controlling transmission power for transmitting the signal from the transmitting means, on the basis of an identification result obtained by the identifying means.

Abstract: A communication device includes transmitting means for transmitting a signal in one or more frequency bands of a frequency channel including a plurality of frequency bands, identifying means for identifying occupancy of the plurality of frequency bands, and control means for controlling transmission power for transmitting the signal from the transmitting means, on the basis of an identification result obtained by the identifying means.

Abstract: An antenna includes: a feeding point; an antenna element unit having one end connected to the feeding point and the other end connected to the ground conductor; and a first conductive portion connected to the ground conductor. The antenna element unit has, between one end and the other end, a second conductor portion having a shape in which a plurality of bent parts are formed, and at least a part of the antenna element unit and at least a part of the first conductive portion are electromagnetically coupled with each other.

Abstract: There is provided a branch circuit that comprises a first conductor and a second conductor as at least two branches from a predetermined branch point, a first stub connected to the first conductor at a first point, and a second stub connected to the second conductor at a second point, wherein the first point is a point where a length of a portion between the predetermined branch point and the first point of the first conductor is set to a first length determined in accordance with a characteristic of the first stub, and the second point is a point where a length of a portion between the predetermined branch point and the second point of the second conductor is set to a second length determined in accordance with a characteristic of the second stub and is different from the first length.

Abstract: A communication device includes transmitting means for transmitting a signal in one or more frequency bands of a frequency channel including a plurality of frequency bands, identifying means for identifying occupancy of the plurality of frequency bands, and control means for controlling transmission power for transmitting the signal from the transmitting means, on the basis of an identification result obtained by the identifying means.

Abstract: A structure which cuts off propagation of an electromagnetic wave at one or more frequencies is provided. The structure comprises linear third conductors arranged on a plurality of different layers different from a first layer of a substrate including the first layer where a first conductor is formed and a second layer where a second conductor is formed, and at least one fourth conductor configured to connect one end of one conductor out of the third conductors to one end of another conductor out of the third conductors. At least one of the third conductors has a curved shape.

Abstract: An antenna that comprises a feeding point, a first conductor and a second conductor is provided. The first conductor is connected to the feeding point, includes, as an open end, an end which is not connected to the feeding point, and has a linear shape. The second conductor is formed to branch from the first conductor, includes, as an open end, an end on an opposite side of a point branching from the first conductor, and has a linear shape. At least part of the first conductor and at least part of the second conductor are formed on different planes and include coupling portions electromagnetically coupled to each other.

Abstract: A filter which stops the propagation of an electromagnetic wave of a predetermined frequency band in a signal line or a power supply line is provided. This filter is a conductor connected to the signal line or the power supply line. This conductor is configured to include a linear portion. The first portion of the linear portion with an end portion connected to the signal line or the power supply line has the first width, and the second portion different from the first portion of the linear portion has the second width different from the first width.

Abstract: A metamaterial is configured by arranging at least one element on a planar conductor plate, where the at least one element has a first conductor portion arranged a predetermined distance away from the conductor plate in a two-dimensional plane that includes the conductor plate, and a second conductor portion arranged so as to connect the conductor plate and the first conductor portion.

Abstract: An antenna which operates in a plurality of frequency bands includes a feeding point, a first conductor which is connected to the feeding point, and at least two second conductors which are branched from the first conductor, have a linear shape, and include open ends as ends on a side opposite to the first conductor. The open ends of the two second conductors face in almost the same direction substantially parallel to a side closest to the feeding point out of the sides of an antenna region. The two second conductors include a part at which the distance between the two conductors at a portion parallel to the side is a first distance, and another part at which the distance is a second distance shorter than the first distance, and are electromagnetically coupled at, at least the other part.

Abstract: The impedance value of an antenna for performing wireless power transfer with a power receiving apparatus is detected. When a change in the impedance value is detected, wireless power transfer with the power receiving apparatus is stopped.

Abstract: A structure which cuts off propagation of an electromagnetic wave at one or more frequencies is provided. The structure comprises linear third conductors arranged on a plurality of different layers different from a first layer of a substrate including the first layer where a first conductor is formed and a second layer where a second conductor is formed, and at least one fourth conductor configured to connect one end of one conductor out of the third conductors to one end of another conductor out of the third conductors. At least one of the third conductors has a curved shape.

Abstract: An antenna which operates in a plurality of frequency bands includes a feeding point, a first conductor which is connected to the feeding point, and at least two second conductors which are branched from the first conductor, have a linear shape, and include open ends as ends on a side opposite to the first conductor. The open ends of the two second conductors face in almost the same direction substantially parallel to a side closest to the feeding point out of the sides of an antenna region. The two second conductors include a part at which the distance between the two conductors at a portion parallel to the side is a first distance, and another part at which the distance is a second distance shorter than the first distance, and are electromagnetically coupled at, at least the other part.