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58results about How to "Flexible routing" patented technology

Signal conversion in communications satellites

Apparatus for use in a communications satellite to select signals in a first frequency range from a received multiplexed signal comprises a first mixer arranged to mix the received signal with a first local oscillator LO signal to down-convert the received signal so that a signal within the received signal at a centre frequency of the first frequency range is converted to an intermediate frequency IF, a bandpass filter arranged to filter the mixed signal such that the filter bandwidth defines the width of the first frequency range, the bandpass filter having a passband with a centre frequency at the IF, and a second mixer arranged to mix the filtered IF signal with a second LO signal to up-convert the IF signal to the output frequency range. One of the first and second LO signals is a mixed LO signal obtained by mixing the other one of the first and second LO signals with a third LO signal, and the output frequency range is different to an input frequency range in which the multiplexed signal was received. The first LO signal is controllable to change the frequency that is converted to the intermediate frequency by the mixer, to select a different frequency range as the first frequency range. A system is also disclosed for flexibly routing signals in a communications satellite. The system comprises an input arranged to send the received signal to each one of a plurality of frequency-conversion modules comprising the apparatus, a plurality of amplifiers for amplifying converted signals outputted by the frequency-conversion modules, and an output module arranged to receive the amplified signals and form a plurality of downlink beams, each downlink beam including one or more of the amplified converted signals. The amplifiers can be variable-power amplifiers to amplify each converted signal to a transmit power according to the bandwidth occupancy. The system can be used in forward or return path payloads.
Owner:AIRBUS DEFENCE & SPACE

Base station multichannel phase synchronization device and method and base station

The invention provides a base station multichannel phase synchronization device, a base station multichannel phase synchronization method and a base station, and the base station multichannel phase synchronization device comprises a plurality of channels, a clock circuit and a calibration circuit. Each channel is provided with a local oscillator circuit used for generating a local oscillator signal, and the clock circuit is connected with each channel to provide a clock signal for each channel. The calibration circuit is used for obtaining the phase difference of each channel relative to the reference channel and performing phase calibration on each channel based on the phase difference. According to the multi-channel phase synchronization device of the base station, each channel is independently provided with the local oscillation circuit, and all the channels share one synchronous clock. Therefore, the phases of the channels are synchronized to a certain extent through the common clock reference. Moreover, because the clock signal frequency is low and the insertion loss is small, an amplifier does not need to be arranged, the influence of stray does not need to be considered toomuch, the overall structure of the base station is effectively simplified, and the problem of multi-channel phase synchronization of the base station is solved.
Owner:ZTE CORP

Coplanar waveguide feeding-based semi-ring-shaped surface wave transmission line and power splitter

ActiveCN106711563AAchieve conversionRealize planar circuit structureCoupling devicesThermodynamicsCoplanar waveguide
The present invention discloses a coplanar waveguide feeding-based semi-ring-shaped surface wave transmission line and power splitter. The transmission line comprises a dielectric substrate, a first coplanar waveguide, a second coplanar waveguide, a first transition structure, a second transition structure and a semi-ring-shaped surface wave structure; the first coplanar waveguide, the second coplanar waveguide, the first transition structure, the second transition structure and the semi-ring-shaped surface wave structure are arranged on the same layer of the dielectric substrate; the first coplanar waveguide and the second coplanar waveguide are in bilateral symmetry; the first transition structure and the second transition structure are in bilateral symmetry; the first coplanar waveguide is connected with the left end of the semi-ring-shaped surface wave structure through the first transition structure; and the second coplanar waveguide is connected with the right end of the semi-ring-shaped surface wave structure through the second transition structure. With the transmission line and power splitter of the invention adopted, the conversion of TEM waves to surface waves can be realized under a condition that the dielectric substrate has no bottom metal ground, and electromagnetic waves can be transmitted with low loss.
Owner:SOUTH CHINA UNIV OF TECH
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