摘要:
An antenna apparatus includes an antenna element and a parasitic element provided on a first surface of a dielectric substrate, and an antenna element and a parasitic element provided on a second surface of the dielectric substrate. Each of the parasitic elements is provided at a position away from the antenna elements by a distance of one-fourth of an operating wavelength λ in communication.
摘要:
A plurality of directional patterns are classified into groups and stored in a directional pattern memory, such that among the plurality of directional patterns, the directional patterns strongly correlated with each other are classified into the same group, while the directional patterns weakly correlated with each other are classified into the different groups. One directional pattern is selected from each group in the directional pattern memory. One directional pattern is determined from the selected directional patterns, in accordance with a communication quality of signals each received when each one of the selected directional patterns is set for steerable antenna element. The determined directional pattern is set for the steerable antenna element.
摘要:
When a variable directivity antenna apparatus is controlled to form an initial composite directional pattern, RSSI is measured, and a weak electric field group or an intense electric field group is selected based on the measured RSSI. When the variable directivity antenna apparatus is controlled to form the composite directional patterns included in the selected composite directional pattern group, PER for each of the composite directional patterns is measured, and one composite directional pattern is selected from among the composite directional patterns included in the selected composite directional pattern group based on the measured PER, so that the variable directivity antenna apparatus is controlled to form the selected composite directional pattern.
摘要:
An unequal three-way divider divides an input signal into three in-phase signals whose power ratio is different between a center and both ends. The unequal three-way divider includes an input terminal, and three output terminals for outputting a three-divided signal respectively, and three transmission lines branched from the input terminal are provided between the input terminal and the three output terminals. The transmission line connected to the center output terminal has a first transmission line which is connected in series and a second transmission line whose electrical length is ¼ wave length. Two transmission lines connected to the output terminals at both ends have a third transmission line which is connected in series and a fourth transmission line whose electrical length is ¼ wave length respectively. An absorption resistor is provided between a connection point between the first transmission line and the second transmission line and connection points between the third transmission lines and the fourth transmission lines respectively. An electrical length of the first transmission line or the third transmission line is ¼ wave length.
摘要:
When controlling antenna apparatuses to select a predetermined combination from among a plurality of combinations of antenna elements, a controller measures RSSIs of wireless signals received by the antenna apparatuses, and sets a detection packet interval and a changeover threshold based on measured RSSIs with reference to a detection packet interval table and a changeover threshold table. Then, the combination of the antenna elements is changed over by using the set detection packet interval and the changeover threshold.
摘要:
A communication apparatus (10) includes: a measurement data transmitting unit (120) which transmits a first measurement data to a relay apparatus (20), and a second measurement data to a partner apparatus (30); a response data receiving unit (130) which receives first and second response data; a network measurement unit (140) which calculates a first communication time using the first response data, and a second communication time using the second response data; a connection mode judging unit (150) which judges, based on a partner section communication time that is difference between the second and the first communication times, whether or not the relay apparatus (20) and the partner apparatus (30) are wirelessly connected; and a connection mode switching unit (160) which switches, when judged that the relay apparatus (20) and the partner apparatus (30) are wirelessly connected, the communication with the partner apparatus (30) from indirect to direct wireless communication.
摘要:
A directional pattern table memory stores combined directional pattern groups in each of which combined directional patterns are ordered by different predetermined priority according to a different radio propagation environment. A controller computes a communication performance expected value based on RSSIs for when an initial combined directional pattern is set on steerable antenna apparatuses; selects one combined directional pattern group based on relative strengths of RSSIs; and according to the priority, sequentially sets combined directional patterns of the selected one combined directional pattern group, on the steerable antenna apparatuses, computes a communication performance value based on a PHY rate and a PER at each of sequential settings, and performs communication using a combined directional pattern with a communication performance value that first exceeds the communication performance expected value.
摘要:
A plurality of directional patterns are classified into groups and stored in a directional pattern memory, such that among the plurality of directional patterns, the directional patterns strongly correlated with each other are classified into the same group, while the directional patterns weakly correlated with each other are classified into the different groups. One directional pattern is selected from each group in the directional pattern memory. One directional pattern is determined from the selected directional patterns, in accordance with a communication quality of signals each received when each one of the selected directional patterns is set for steerable antenna element. The determined directional pattern is set for the steerable antenna element.
摘要:
A communication apparatus (10) includes: a measurement data transmitting unit (120) which transmits a first measurement data to a relay apparatus (20), and a second measurement data to a partner apparatus (30); a response data receiving unit (130) which receives first and second response data; a network measurement unit (140) which calculates a first communication time using the first response data, and a second communication time using the second response data; a connection mode judging unit (150) which judges, based on a partner section communication time that is difference between the second and the first communication times, whether or not the relay apparatus (20) and the partner apparatus (30) are wirelessly connected; and a connection mode switching unit (160) which switches, when judged that the relay apparatus (20) and the partner apparatus (30) are wirelessly connected, the communication with the partner apparatus (30) from indirect to direct wireless communication.
摘要:
An unequal three-way divider divides an input signal into three in-phase signals whose power ratio is different between a center and both ends. The unequal three-way divider includes an input terminal, and three output terminals for outputting a three-divided signal respectively, and three transmission lines branched from the input terminal are provided between the input terminal and the three output terminals. The transmission line connected to the center output terminal has a first transmission line which is connected in series and a second transmission line whose electrical length is ¼ wave length. Two transmission lines connected to the output terminals at both ends have a third transmission line which is connected in series and a fourth transmission line whose electrical length is ¼ wave length respectively. An absorption resistor is provided between a connection point between the first transmission line and the second transmission line and connection points between the third transmission lines and the fourth transmission lines respectively. An electrical length of the first transmission line or the third transmission line is ¼ wave length.