Abstract: An antenna apparatus includes first and second antenna elements. The first antenna element operates as a loop antenna that resonates at a first wavelength, and the antenna apparatus operates as an inverted-F antenna that resonates at a second wavelength. The first antenna elements includes a first element portion formed to have a predetermined height from a surface of a dielectric substrate, and the second antenna element includes a second element portion which is formed to be substantially parallel to the first element portion at least at a predetermined distance apart from the first antenna element.

Abstract: A wireless communications apparatus (1) in the present invention transmits, via wireless communications, data recorded on a memory unit (13) to a recording apparatus (2). The wireless communications apparatus (1) includes: a communication area determining unit (19) determining whether or not the wireless communications apparatus (1) is in a communication area having a threshold value equal to MIDDLE or higher; a stillness detecting unit (15) detecting whether or not the wireless communications apparatus (1) remains still; and a wireless communications unit (17) starting to transmit, via the wireless communications, the data recorded on the memory unit (13) to the recording apparatus (2) in the case where (i) the communication area determining unit (19) determines that the wireless communications apparatus (1) is in the communication area having the threshold value equal to MIDDLE or higher, and (ii) the stillness detecting unit (15) detects that the wireless communications apparatus (1) remains still.

Abstract: An antenna unit is provided with: steerable antennas, each having one active antenna element and two parasitic antenna element; and metal blocks. Each of the active antenna elements is associated with at least one of the metal blocks such that the metal block is disposed remote from the active antenna element by a predetermined distance and operates as a reflector for the active antenna element. Each of the parasitic antenna elements is provided with a switching circuit for changing an electrical length of the parasitic antenna element, and the parasitic antenna element operates as a reflector for an active antenna element of the same steerable antenna as the parasitic antenna element by changing the electrical length using the switching circuit.

Abstract: A feed element is configured to include a first antenna element having a first width, a dual-band forming inductor, and a second antenna element having a second width wider than the first width, where the first antenna element, the dual-band forming inductor, and a second antenna element are connected in series. The inductor is formed in a meander shape which has a trapezoidal envelope external shape to have a width formed to widen from the first width of a portion connected to the first antenna element toward a portion connected to the second antenna element. Cut portions each having a rectangular shape are further formed at corner portions of another ends of the parasitic elements, respectively.

Abstract: In an inverted F pattern antenna apparatus having a first antenna element and an electrical length of a quarter wavelength of a first resonance frequency, the inverted F pattern antenna apparatus having two resonance frequencies is configured to include a third antenna element and a second antenna element at an end portion of the first antenna element, and setting a length having an electrical length obtained by adding the electrical length of a further provided antenna element to the electrical length of the inverted F pattern antenna apparatus to the electrical length of a quarter wavelength of a second resonance frequency to achieve resonance at the second resonance frequency. In addition, a loop antenna is configured to include the first, third and second antenna elements and the grounding antenna element by capacitively coupling another end of the third antenna element to the grounding antenna element.

Abstract: 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 ? in communication.

Abstract: 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.

Abstract: 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.

Abstract: A variable directivity antenna apparatus is configured to include a parasitic element, a plurality of antenna elements each provided to be away from the parasitic element by an electrical length of a quarter-wavelength, and a PIN diode connected to the parasitic element and changing over whether or not to ground the parasitic element. A radiation pattern from the variable directivity antenna apparatus is changed by outputting a control signal for changing over whether or not the parasitic element operates as a parasitic element by selectively turning on or off the PIN diode.

Abstract: 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.

Abstract: In an inverted F pattern antenna apparatus having a first antenna element and an electrical length of a quarter wavelength of a first resonance frequency, the inverted F pattern antenna apparatus having two resonance frequencies is configured to include a third antenna element and a second antenna element at an end portion of the first antenna element, and setting a length having an electrical length obtained by adding the electrical length of a further provided antenna element to the electrical length of the inverted F pattern antenna apparatus to the electrical length of a quarter wavelength of a second resonance frequency to achieve resonance at the second resonance frequency. In addition, a loop antenna is configured to include the first, third and second antenna elements and the grounding antenna element by capacitively coupling another end of the third antenna element to the grounding antenna element.

Abstract: 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.

Abstract: Before start of streaming, a server apparatus obtains from client apparatuses their respective numbers of antenna combinations, determines a training time t1 according to the maximum of the numbers of antenna combinations, and notifies the client apparatuses of the training time t1. Each client apparatus determines a training time t2 required to estimate transmission path conditions for one antenna combination, based on the training time t1. The server apparatus transmits a training signal during the training time t1. Each client apparatus estimates transmission path conditions using the training signal during the training time t2 for each antenna combination, and selects and sets an antenna combination based on the estimated transmission path conditions.

Abstract: A feed element is configured to include a first antenna element having a first width, a dual-band forming inductor, and a second antenna element having a second width wider than the first width, where the first antenna element, the dual-band forming inductor, and a second antenna element are connected in series. The inductor is formed in a meander shape which has a trapezoidal envelope external shape to have a width formed to widen from the first width of a portion connected to the first antenna element toward a portion connected to the second antenna element. Cut portions each having a rectangular shape are further formed at corner portions of another ends of the parasitic elements, respectively.

Abstract: 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.

Abstract: A feed element is configured to include a first antenna element having a first width, a dual-band forming inductor, and a second antenna element having a second width wider than the first width, where the first antenna element, the dual-band forming inductor, and a second antenna element are connected in series. The inductor is formed in a meander shape which has a trapezoidal envelope external shape to have a width formed to widen from the first width of a portion connected to the first antenna element toward a portion connected to the second antenna element.

Abstract: An antenna unit is provided with: steerable antennas, each having one active antenna element and two parasitic antenna element; and metal blocks. Each of the active antenna elements is associated with at least one of the metal blocks such that the metal block is disposed remote from the active antenna element by a predetermined distance and operates as a reflector for the active antenna element. Each of the parasitic antenna elements is provided with a switching circuit for changing an electrical length of the parasitic antenna element, and the parasitic antenna element operates as a reflector for an active antenna element of the same steerable antenna as the parasitic antenna element by changing the electrical length using the switching circuit.

Abstract: 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.

Abstract: A steerable antenna includes an radiating antenna element and parasitic antenna elements. Each of the parasitic antenna elements is provided with a pair of PIN diodes. On each of control lines connecting the PIN diodes to a controller, inductors are provided at predetermined intervals on portions of the control line electromagnetically coupled to another steerable antenna. The intervals for providing the inductors is set to such a length that substantially no resonance occurs in a section of the control line between the inductors at an operating frequency of the steerable antenna.

Abstract: 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.