Abstract: A throughput estimation system according to the present invention comprises, in a space in which a first communication device that generates a beacon is installed, a radio wave receiver having a plurality of antennas that receive the beacon transmitted from the first communication device, and a processor that processes a reception measurement result from the radio wave receiver. On the basis of beacon reception power received by each of the plurality of antennas and the number of the plurality of antennas that detected the beacon, the processor estimates the throughput between the first communication device and a second communication device assumed to be installed in the vicinity of the site at which the beacon was received within the space.

Abstract: An antenna device includes a first conductor corresponding to communication in a first frequency band, a ground conductor that faces the first conductor, and a second conductor that is disposed between the first conductor and the ground conductor, faces the first conductor and the ground conductor, and has a power supply point. The second conductor is disposed so as to face one end side of the first conductor in an upper-lower direction of the first conductor. The first conductor has a slot disposed at a position facing the other end side opposite to the second conductor, the slot corresponding to communication in a second frequency band that is different from the first frequency band.

Abstract: There are provided an antenna device and a communication device including: a feed antenna connected to a feed point and extending from the feed point, the feed antenna corresponding to a first frequency; a loop antenna connected to a ground and arranged to surround the feed antenna, the loop antenna corresponding to a second frequency lower than the first frequency; and a resonator arranged outside the loop antenna in a direction in which the feed antenna extends, the resonator corresponding to the second frequency. The loop antenna includes an extending portion that extends to protrude outward on a side where the resonator is arranged with respect to the feed point.

Abstract: There are provided an antenna device and a communication device including: a feed antenna connected to a feed point; a loop antenna connected to ground and arranged to surround the feed antenna; and two resonators provided inside the loop antenna and on both sides of the feed antenna in a short direction of the feed antenna. Each of the two resonators is connected to the loop antenna and has an L shape.

Abstract: There are provided an antenna device and a communication device including: a board including a metamaterial layer, a ground layer, and a first layer disposed on a side opposite to the ground layer across the metamaterial layer; a first resonator to which power is fed, the first resonator being provided in the first layer; and a second resonator including two conductors provided along a longitudinal direction of the first resonator, the conductors being provided on the first layer and on both sides of the first resonator in a short direction of the first resonator. The two conductors of the second resonator have end portions, and one terminal of each of the end portions is connected to the ground layer.

Abstract: An antenna device includes: a feeding antenna conductor; a non-feeding antenna conductor; a ground conductor; a first artificial magnetic conductor disposed between the feeding antenna conductor and the non-feeding antenna conductor, and the ground conductor; and a second artificial magnetic conductor disposed side by side with the first artificial magnetic conductor and electrically connected to the ground conductor. The feeding antenna conductor and the non-feeding antenna conductor are disposed on the first artificial magnetic conductor.

Abstract: Provided is an antenna device including a feeding antenna conductor, a non-feeding antenna conductor, a ground conductor, and an artificial magnetic conductor disposed between the feeding antenna conductor and the non-feeding antenna conductor, and the ground conductor. The antenna device further includes a conductor that electrically connects the artificial magnetic conductor to the ground conductor. The conductor is disposed at a position opposite to the feeding antenna conductor with respect to the non-feeding antenna conductor, and is separated from the non-feeding antenna conductor.

Abstract: An antenna device includes an antenna surface on which an antenna conductor is provided, a ground surface which is opposed to the antenna surface and on which a ground conductor is provided, and a stub configured by connecting, in series, a plurality of transmission lines in which a line width of at least a part of at least one transmission line is different from line widths of other two or more transmission lines. The at least one transmission line has straight portions and a bent portion.

Abstract: A radio wave environment display system includes a measurement antenna and a radio wave environment display device. The measurement antenna measures a radio wave intensity of a first radio wave transmitted by the wireless communication service, and performs a scan of radio wave intensities of radio waves including the first radio wave in a target area. The radio wave environment display device includes a processor configured to: select a radio wave intensity of a second radio wave having a frequency the same as or in the vicinity of a frequency of the first radio wave from the radio waves obtained by the scan; and calculate a communication environment of a wireless communication service on the basis of a difference between the radio wave intensity of the first radio wave and the radio wave intensity of the second radio wave.

Abstract: A radio wave environment display device includes a receiver configured to receive: a first measurement result of radio wave intensity including a frequency and a measurement position of a first radio wave transmitted from a radio transmitter corresponding to radio identification information designated by a user; and second measurement results of radio wave intensity including frequencies and a measurement position of waves including the first radio wave. The device further includes a processor configured to: select at least one second measurement result corresponding to at least one radio wave, other than the first radio wave, having a frequency the same as or in the vicinity of that of the first radio wave; and cause a display to display thereon a difference between the first measurement result and the at least one second measurement result as a radio wave environment at the measurement position of the first radio wave.

Abstract: A radio wave measurement device includes: a transmission antenna; a reception antenna; a main circuit configured to output a transmission signal to the transmission antenna and measure a strength of a reception signal received with the reception antenna; a connection circuit disposed between the main circuit and the reception antenna, and configured to reduce flowing of the transmission signal into the reception antenna; at least one isolator disposed between the connection circuit and the reception antenna, and configured to reduce flowing of the transmission signal into the reception antenna; and a coupler disposed between the reception antenna and the at least one isolator, the coupler being configured to distribute the reception signal to the main circuit and an external signal-waveform measurement device.

Abstract: The antenna device includes an antenna surface having an antenna conductor, a ground surface facing the antenna surface and having a ground conductor, and a stub including a plurality of transmission lines coupled in series, the plurality of transmission lines having different line widths. The stub is located between the antenna surface and the ground surface. The antenna conductor electrically conducted to the stub via a feeding point coupled to a transmission line on one end side, of the plurality of transmission lines.

Abstract: A radio wave environment display device includes a display unit that displays a radio wave environment and a controller. The radio wave environment display device displays a radio wave environment in an area where a plurality of wireless transmitters located at different positions transmit radio waves. The controller selects, at each of a plurality of points in the area, a maximum intensity among intensities that are magnitudes of received power of radio waves transmitted from the wireless transmitters and causes the display unit to display the radio wave environment at each of the plurality of points based on the maximum intensity selected and an arrival direction of a radio wave with the maximum intensity selected.

Abstract: An antenna device includes an antenna surface provided with an antenna conductor, a ground surface opposed to the antenna surface and provided with a ground conductor, and a stub in which a plurality of transmission lines having different line widths are connected to each other in series. The stub is located in approximately the same plane as the antenna surface or between the antenna surface and the ground surface.

Abstract: An antenna device includes a first conductor corresponding to communication in a first frequency band, a ground conductor that faces the first conductor, and a second conductor that is disposed between the first conductor and the ground conductor, faces the first conductor and the ground conductor, and has a power supply point. The second conductor is disposed so as to face one end side of the first conductor in an upper-lower direction of the first conductor. The first conductor has a slot disposed at a position facing the other end side opposite to the second conductor, the slot corresponding to communication in a second frequency band that is different from the first frequency band.

Abstract: A radio wave measurement method used in a transmitter and a receiver, includes transmitting a radio wave from the transmitter, receiving the radio wave by the receiver through a scatterer, measuring, a plurality of times, reception qualities of the radio waves received by the reception antenna of the main reception surface and received respectively by the reception antennas of the plurality of sub-reception surfaces while changing a position of the receiver, and determining a position of the receiver when the reception quality of the radio wave corresponding to the reception antenna of the main reception surface and the reception qualities of the radio waves corresponding to the plurality of sub-reception surfaces satisfy a predetermined condition as a measurement position used for derivation of a material constant of the scatterer.

Abstract: An antenna device including: a ground conductor having one end and another end in a longitudinal direction; a feeding antenna conductor disposed close to the other end; a non-feeding antenna conductor disposed close to the one end; an artificial magnetic conductor that is layered between the feeding and the non-feeding antenna conductors, and the ground conductor, and that is disposed away from each of the feeding and non-feeding antenna conductors, and the ground conductor; and at least one via conductor that is disposed between the one end of the ground conductor and the non-feeding antenna conductor in the longitudinal direction, and that electrically connects the ground conductor and the artificial magnetic conductor, wherein in the longitudinal direction, a length from the one end of the ground conductor to the non-feeding antenna conductor is shorter than a length from the other end of the ground conductor to the feeding antenna conductor.

Abstract: An antenna device includes: a first conductor layer; a second conductor layer located opposite to the first conductor layer; and a third conductor layer located opposite to the second conductor layer. The first conductor layer includes: a feed element; a first grounding element located next to the feed element in a first direction and grounded; and a parasitic element located along the feed element and the first grounding element and insulated from the feed element and the first grounding element. The second conductor layer includes: a floating element located opposite to the feed element and insulated from the first conductor layer; and a second grounding element located opposite to the first grounding element and next to the floating element and grounded. The third conductor layer includes a third grounding element grounded.

Abstract: An antenna device includes: a feeding antenna conductor; a non-feeding antenna conductor; a ground conductor; a first artificial magnetic conductor disposed between the feeding antenna conductor and the non-feeding antenna conductor, and the ground conductor; and a second artificial magnetic conductor disposed side by side with the first artificial magnetic conductor and electrically connected to the ground conductor. The feeding antenna conductor and the non-feeding antenna conductor are disposed on the first artificial magnetic conductor.

Abstract: An antenna device includes an antenna, a first ground conductor, and an artificial magnetic conductor. The artificial magnetic conductor is sandwiched between the antenna and the first ground conductor, and separated from the antenna and the first ground conductor. The first ground conductor includes a first cutaway part on one end side, the first cutaway part having a substantially rectangular shape.