摘要:
An apparatus simultaneously transmits at least a first signal and a second signal. Each one of those signals comprises a data sequence and a training sequence. The apparatus is arranged to simultaneously transmit a training sequence of the first signal and a data sequence of the second signal for improving the spectral efficiency and thus the data throughput.
摘要:
The invention relates to an antenna diversity comprising a first and a second antenna element where the first antenna element is operated in an active mode whereas the second antenna element is operated in a parasitic mode. The present invention minimizes the amount of mismatch while still being able to maximize a predetermined signal quality criterion for the electromagnetic signal on the active path between the first antenna element and the transceiver. By providing a pre-selection unit 130 as well as a selection unit 140 for selecting an optimal adjustable impedance connected to the second antenna ensuring that the amount of said mismatch is below a predetermined threshold value and that simultaneously a predetermined quality criterion for the transceived electromagnetic signal is fulfilled best within the range determined by the allowable mismatch. The invention further relates to a method for operating such an antenna diversity.
摘要:
For audio and/or video or control signal transmission between two rooms in, for example, a house, inductive and/or capacitive transmitters and receivers are used which are installed on opposite sides of the partition or wall that separates the rooms. The signals to be transmitted may be applied or tapped from the transmitter/receiver by cables or by infrared transceiving diodes. The transmitter and receiver consist of, for example, two metal plates or two coils installed substantially opposite each other on opposing sides of the wall.
摘要:
A waveguide comprises a longitudinal first conductor (110) located in an inner space of a box-shaped longitudinal shield conductor which is provided with a slot (122) defining a sliding support for a substantially plate-shaped coupler (300). The shield conductor (120) is provided with flanges (125, 126) extending substantially parallel to each other on opposite sides of the slot (122). A coupling conductor portion (322) faces the first conductor (110).
摘要:
A portable communication device has an antenna configuration that allows to form various different antenna directivity configurations. In particular, a control device discriminates between a transmitting state and a receiving state of the communication device. As based thereon, it effects various non-uniform selection patterns among the directivity configurations.
摘要:
A balanced oscillator comprises a frequency selective circuit and a balanced active circuit coupled with the frequency selective circuit. The frequency selective circuit includes a short circuited quarter-wave paired line. A cost effective short circuited quarter-wave paired line can be U-shaped to take up only a small space and can be integrated easily on a dielectric, especially glass. The balanced active circuit comprises a cross coupled differential pair of transistors. The balanced oscillator can be tuned in a number of different ways.
摘要:
A traveling-wave amplifier includes amplifiers coupled anti-parallel to transmission lines. Phase(s) of the amplifiers provide phase matching, which may additionally or alternately be provided by couplers or spatial offset of the amplifiers and couplers. The traveling-wave amplifier provides compensation for the losses of the transmission lines, amplification of the signals and isolation between input and output by coupling the amplifiers to the transmission lines anti-parallel.
摘要:
The invention relates to a travelling-wave amplifier comprising amplifiers and transmission lines. The travelling-wave amplifier provides compensation for the losses of the transmission lines, amplification of the signals and isolation between input and output by coupling the amplifiers to the transmission lines anti-parallel.
摘要:
The invention relates to an antenna diversity comprising a first and a second antenna element one of which is operated in an active mode whereas the other one of which is operated in a parasitic mode. It is the object of the present invention to further minimize the amount of mismatch by still being able to maximize a predetermined signal quality criterion for the electromagnetic signal on the active path between the active antenna and the transceiver. This object is solved by a switching unit 120 for either operating the first antenna element in the parasitic mode and simultaneously operating the second antenna element in the active mode or vice versa and by providing a pre-selection unit 130 as well as a selection unit 140 for selecting an optimal configuration for the antenna diversity ensuring that the amount of said mismatch is below a predetermined threshold value and that simultaneously a predetermined quality criterion for the transceived electromagnetic signal is fulfilled best. The antenna diversity further comprises a control unit 150 for adjusting said selected configuration. The invention further relates to a method for operating such an antenna diversity.
摘要:
The invention describes a filter arrangement as well as an electronic component, each with a bulk acoustic wave resonator unit which is present on a carrier substrate (1). A reflection element (2) is provided between the carrier substrate (1) and the bulk acoustic wave resonator unit for the purpose of acoustic insulation of the generated oscillations. This reflection element (2) may consist either of several layers of alternately high and low impedance or, if the acoustically reflecting substance has a sufficiently low impedance, of a single layer. In addition, a mobile telephone device, a transmitter, a receiver, and a wireless data transmission system as well as a method of manufacturing an electronic component are described.