摘要:
A wireless communication system which performs data transmission from a first terminal including N antennas to a second terminal including M antennas using spatially multiplexed streams (N and M are integers larger than or equal to 2 and N
摘要:
A monoconical antenna comprises: a substantially conical concavity formed in one end face of a dielectric; a radiation electrode provided on the surface of the concavity; and a ground conductor provided in proximity to and substantially in parallel with the other end face opposite the one end face of the dielectric. The monoconical antenna is so constituted that electrical signals are fed to between the near vertex region of the radiation electrode and the region of the ground conductor. The half-cone angle α of the substantially conical concavity formed in the one end face of the dielectric is determined by a predetermined rule corresponding to relative dielectric constant εr. Thus, the quality of wideband characteristics inherent in the monoconical antenna can be sufficiently maintained, and further size reduction can be accomplished by dielectric loading.
摘要:
A broadband antenna apparatus includes a conducting ground plate, on which a three-dimensional member rests. A radiating conductor is stuck or printed on the three-dimensional member in such a manner that at least part of the radiating conductor is opposite to at least part of the ground plate. A wavelength shortening effect is achieved by the interposition of the three-dimensional member between the opposite parts of ground plate 1 and radiating conductor. This effect makes the broadband antenna apparatus smaller and lower in structure.
摘要:
Disclosed are a wireless communication apparatus, a wireless communication method, and a computer program for intercommunication between a plurality of wireless stations. In a reception standby state, packet detection is performed by using a part of the plurality of reception branches to disable the reception operation of the remaining reception branches that do not perform packet detection, and thereby reducing the power consumption during packet detection standby. Further, in a packet reception state, only the minimum necessary number of reception branches for receiving signal that is spatially multiplexed is enabled by MIMO transmission, and thereby reducing the power consumption also during reception of MIMO signals.
摘要:
Disclosed is a flat-type antenna apparatus which has a radiating conductor and a reference conductor disposed opposite to each other and performs feeding between the radiating conductor and the reference conductor at a position offset from the center of the radiating conductor center. The antenna includes: an insulative material layer which has relative magnetic permeability greater than land is placed in a gap between the radiating conductor and the reference conductor; and a short-circuiting conductor which is disposed at a position to suppress unintended excitation and enables electric conduction between the radiating conductor and the reference conductor.
摘要:
A broadband antenna apparatus includes a conducting ground plate, on which a three-dimensional member rests. A radiating conductor is stuck or printed on the three-dimensional member in such a manner that at least part of the radiating conductor is opposite to at least part of the ground plate. A wavelength shortening effect is achieved by the interposition of the three-dimensional member between the opposite parts of ground plate 1 and radiating conductor. This effect makes the broadband antenna apparatus smaller and lower in structure.
摘要:
An antenna coupling apparatus, an external-antenna connecting apparatus, and an onboard external-antenna connecting apparatus which inhibits unnecessary power emissions, reduces transmission loss, and offers high durability and high ease of operation, has an electromagnetic coupling element consisting of a conductor that is not in contact with a first antenna with respect to DC components and a ground conductor element consisting of a conductor that is not in contact with the first antenna with respect to DC components and in contact with a ground conductor with respect to DC components and reflecting the power transmitted or received by the first antenna toward the electromagnetic coupling element. An external-antenna connecting apparatus and an onboard external-antenna connecting apparatus have an electromagnetic coupling circuit in their bodies that electromagnetically couples the antenna of a portable radio terminal and an external antenna, with the external-antenna connecting apparatus and the onboard external-antenna connecting apparatus, being not in contact with the portable radio terminal with respect to DC components, when the portable radio terminal is secured in the bodies.
摘要:
A pulse-width modulating device comprises: a counter for generating a plurality of counter signals of n-bit, where n is an integer of 2 or more; a fundamental waveform generator for outputting a signal for the least significant bit of the count signal as the most significant bit of a fundamental waveform signal, obtaining a first product of inverted signals of all of the count signals for higher order bits than LSB, obtaining a second product of the first product and the count signal for a certain bit, carrying out this for every bit, and outputting n-bit fundamental waveform signals extending from the upper order bits to the lower order bits; and a pulse-width modulator for obtaining a product sum total for each bit of the n-bit data signal and each of the n-bit of fundamental waveform signals corresponding to the each bits of n-bit data and generating a pulse-width modulated signal, configured in such a manner that a pulse-width modulating signal having a pulse-width corresponding to the data signal and having a spectrum of a high frequency can be obtained.
摘要:
According to an illustrative embodiment, a data transmission device is provided. The device includes a communication unit for transmitting data to a receiver and transmitting data having a changed characteristic to the receiver, wherein when transmitting the data the device transmits timing information to the receiver indicating a time that the device will begin transmitting the data having a changed characteristic.
摘要:
Provided is a wireless communication device including a receiving unit that receives, from one or more than one first wireless communication devices, information indicating an order of each of the one or more than one first wireless communication devices in a queue for data communication with a second wireless communication device, an order management unit that manages an order of its own device in the queue based on the information received by the receiving unit from the one or more than one first wireless communication devices, and a transmitting unit that transmits information indicating the order of its own device in the queue managed by the order management unit.