Abstract: A wireless communication device includes a reflecting plate having a reflecting surface that reflects electromagnetic wave, a radome covering the reflecting plate so as to form an airflow path between the radome and the reflecting surface, and including an air inlet and an air outlet communicating with the airflow path, an array antenna provided on the reflecting surface and inside the airflow path, and including a plurality of antenna elements aligned on the reflecting surface with an interval from each other, and a communication circuit that transmits and receives a wireless signal by exciting the array antenna. The plurality of antenna elements each include an antenna pattern formed on a plate-shaped dielectric substrate extending from the reflecting surface in a direction orthogonal thereto. Dissipation effect of heat from the communication circuit can be improved, by causing air convection in the airflow path in the radome.

Abstract: One embodiment provides a cooling structure of a battery, including: a battery; an intake port, from which air in an vehicle interior is taken in; and an intake duct, which is in communication with the intake port and from which the air in the vehicle interior is introduced to the battery, wherein the intake duct is connected with a discharge port of an air conditioning duct, which is connected with an air conditioning system, and from which air discharged from the air conditioning system is introduced.

Abstract: To provide a compact antenna capable of corresponding to a plurality of frequency bands. In a first frequency characteristic adjustment unit, the susceptance thereof varies according to a frequency of an input signal. A second frequency characteristic adjustment unit is connected to the first frequency characteristic adjustment unit and the reactance thereof varies according to the frequency of the input signal. A third frequency characteristic adjustment unit is connected to the second frequency characteristic adjustment unit, the susceptance thereof varies according to the frequency of the input signal. A feeding unit is configured to input a signal of any frequency in a plurality of different frequencies to the second frequency characteristic adjustment unit.

Abstract: When a plurality of antenna elements tuned to respective different frequency bands are closely disposed, the performance (the band, the radiating pattern, and so on) of each antenna element may deteriorate.

Abstract: An antenna according to one exemplary aspect of the present invention includes an antenna element and a reflector conductor that is arranged to be spaced apart from the antenna element. The antenna element includes a first split-ring conductor having such a shape that a part of a ring is cut by a split part, a first connection conductor having one end that is electrically connected to the first split-ring conductor and another end that is electrically connected to the reflector conductor, and a feed line conductor having one end that is electrically connected to the first split-ring conductor. The feed line conductor spans an opening that is formed inside the first split-ring conductor and overlaps an area surrounded by an outer edge of the first connection conductor.

Abstract: A communication apparatus comprises a feeding unit, a plurality of communication units, and a MIMO processing unit. The plurality of communication units input to the feeding unit analog transmission signals obtained by converting digital transmission signals inputted by the MIMO processing unit into analog signals, convert analog received signals distributed and inputted by the feeding unit into digital signals based on the analog received signals, and input the digital signals to the MIMO processing unit. The feeding unit distributes the same number of analog signals based on the analog received signals as the number of the plurality of communication units to the plurality of communication units, and distributes the same number of analog transmission signals as the number of the plurality of communication units to a plurality of antenna elements in such a way that electromagnetic waves having a predetermined phase difference therebetween are radiated.

Abstract: An object of the present invention is to provide a multiband antenna, an antenna array, and a wireless communications device that can achieve miniaturization while preventing deterioration in radiation efficiency.

Abstract: In order to implement a frequency selective plate designable in any shape and size; and an antenna, a wireless communication device, and a radar device including a frequency selective plate designable in any shape and size, a frequency selective plate according to the present invention is a frequency selective plate for transmitting an electromagnetic wave of a predetermined frequency, and reflecting an electromagnetic wave of a frequency other than the predetermined frequency. The frequency selective plate includes at least one or more conductive closed loops configured in such a way that a conductive pattern formed on one layer, and a conductive pattern to be formed on at least one layer different from the one layer are electrically connected by a connecting portion.

Abstract: A wireless communication device includes: a reflector plate that comprises a reflective surface, the reflective surface reflecting an electromagnetic wave; an array antenna that comprises a plurality of antenna elements, the antenna elements being arranged on the reflective surface; one or more fins that stand on the reflective surface; and a transmission and reception circuit that is connected to the reflector plate, and transmits and receives a wireless signal via the array antenna.

Abstract: An object of the present invention is to provide a multiband antenna, an antenna array, and a wireless communications device that can achieve miniaturization while preventing deterioration in radiation efficiency.

Abstract: When a plurality of antenna elements tuned to respective different frequency bands are closely disposed, the performance (the band, the radiating pattern, and so on) of each antenna element may deteriorate.

Abstract: A wireless communication device includes a reflecting plate having a reflecting surface that reflects electromagnetic wave, a radome covering the reflecting plate so as to form an airflow path between the radome and the reflecting surface, and including an air inlet and an air outlet communicating with the airflow path, an array antenna provided on the reflecting surface and inside the airflow path, and including a plurality of antenna elements aligned on the reflecting surface with an interval from each other, and a communication circuit that transmits and receives a wireless signal by exciting the array antenna. The plurality of antenna elements each include an antenna pattern formed on a plate-shaped dielectric substrate extending from the reflecting surface in a direction orthogonal thereto. Dissipation effect of heat from the communication circuit can be improved, by causing air convection in the airflow path in the radome.

Abstract: A multi-band antenna includes: a conductor reflecting plate having a plate surface; a first antenna element that extends along the plate surface of the conductor reflecting plate to a length according to a first wavelength; and a second antenna element that extends along the plate surface of the conductor reflecting plate to a length according to a second wavelength shorter than the first wavelength. A distance between the first antenna element and the plate surface in a perpendicular direction is equal to a distance between the second antenna element and the plate surface in the perpendicular direction, the perpendicular direction being a direction perpendicular to the plate surface.

Abstract: To provide a compact antenna capable of corresponding to a plurality of frequency bands. In a first frequency characteristic adjustment unit, the susceptance thereof varies according to a frequency of an input signal. A second frequency characteristic adjustment unit is connected to the first frequency characteristic adjustment unit and the reactance thereof varies according to the frequency of the input signal. A third frequency characteristic adjustment unit is connected to the second frequency characteristic adjustment unit, the susceptance thereof varies according to the frequency of the input signal. A feeding unit is configured to input a signal of any frequency in a plurality of different frequencies to the second frequency characteristic adjustment unit.

Abstract: Provided are a device detecting the spatial variation of the complex permittivity and an article presence/absence detection system which are capable of detecting the presence or absence of an article by using a UHF-band RFID tag. A device detecting the spatial variation of the complex permittivity includes an RFID tag, a conductor electrode unit, and a dielectric tag base material. The RFID tag performs communication using an electromagnetic wave in a UHF band. The conductor electrode unit communicates with the RFID tag by using the electromagnetic wave in the UHF band. The dielectric tag base material is provided between the RFID tag and the conductor electrode unit and separates the RFID tag from the electrode unit.

Abstract: An antenna array comprises a plurality of antenna elements including a first antenna element having a longitudinal direction along a plane, a second antenna element having a longitudinal direction along the plane and located adjacent to the first antenna element, and a third antenna element having a longitudinal direction along the plane and located adjacent to the first antenna element. The first and second antenna elements are aligned in a row in a vertical direction along the plane. The first and third antenna elements are aligned in a row in a horizontal direction along the plane. A center of the second antenna element in the longitudinal direction thereof is placed on an extended line of the first antenna element drawn in the longitudinal direction. A center of the first antenna element in the longitudinal direction thereof is placed on an extended line of the third antenna element drawn in the longitudinal direction.

Abstract: Provided are an antenna, an antenna array, and a wireless communication device with which it is possible to achieve size reduction while suppressing degradation in radiation efficiency. This antenna comprises two antenna elements and a conductor reflection plate. The antenna element includes: a C-shaped conductor which is a substantially C-shaped conductor in which a split part is formed such that a portion of an annular conductor is made discontinuous; and a conductor power feed line that is electrically connected to one of the two parts of the C-shaped conductor that oppose one another across the split part, the conductor power feed line constituting an electric circuit for feeding power to the C-shaped conductor. The two antenna elements are arranged substantially orthogonal to one another such that, when the elements are projected onto the conductor reflection plate, one antenna element and a portion of the other antenna element overlap one another.

Abstract: Provided are a device detecting the spatial variation of the complex permittivity and an article presence/absence detection system which are capable of detecting the presence or absence of an article by using a UHF-band RFID tag. A device detecting the spatial variation of the complex permittivity includes an RFID tag, a conductor electrode unit, and a dielectric tag base material. The RFID tag performs communication using an electromagnetic wave in a UHF band. The conductor electrode unit communicates with the RFID tag by using the electromagnetic wave in the UHF band. The dielectric tag base material is provided between the RFID tag and the conductor electrode unit and separates the RFID tag from the electrode unit.

Abstract: A dual-polarized antenna in which two antenna elements are highly integrated and the size of the whole antenna is reduced while suppressing coupling between the two antenna elements without having the two antenna elements overlap each other is provided. An antenna (10) includes a conductive reflector (101) and two antenna elements (102, 103) (antenna elements) that are arranged to be spaced apart from each other. As shown in FIG. 3, in a projected view on the conductive reflector (101), longitudinal directions of the two antenna elements (102, 103) are substantially orthogonal to each other. One of the end parts (110) of the antenna element (103) in the longitudinal direction is positioned at an approximate center (109) (part around the center) of the antenna element (102) in the longitudinal direction.

Abstract: An antenna according to one exemplary aspect of the present invention includes an antenna element and a reflector conductor that is arranged to be spaced apart from the antenna element. The antenna element includes a first split-ring conductor having such a shape that a part of a ring is cut by a split part, a first connection conductor having one end that is electrically connected to the first split-ring conductor and another end that is electrically connected to the reflector conductor, and a feed line conductor having one end that is electrically connected to the first split-ring conductor. The feed line conductor spans an opening that is formed inside the first split-ring conductor and overlaps an area surrounded by an outer edge of the first connection conductor.