摘要:
The present invention relates to a high rejection stop band filter and a diplexer using such filters.The stop band filter comprises on a substrate with a ground plane, a transmission line extending between an input and an output and comprises several resonators formed of “stubs” in printed open circuit embedded into the transmission line, the resonators being positioned in parallel together and interconnected in series in the same direction or head to tail.The filters are particularly useful in mobile devices operating in two concurrent frequency bands.
摘要:
The invention relates to a device for receiving signals in a MIMO system comprising: m signal receiver channels, where m is greater than 1; an antenna system constituted either by n directive antennae n>m, each antenna being able to receive signals in one of its own angular sectors, the angular sectors of the n antennae essentially not overlapping each other and together thrilling a total angular sector of 360 degrees, or a multi-sector antenna with n angular sectors n>m the n angular sectors essentially not overlapping each other and having a distinct access; and switching means to associate with each signal receiver channel an antenna from among the n antennae according to a switching schema selected by control means, the switching schema being selected from a plurality of switching schemas of a switching matrix according to a criterion representing the quality of the reception of the signals by said signal receiver channels.
摘要:
The invention relates to a device for receiving signals in a MIMO system comprising: m signal receiver channels, where m is greater than 1; an antenna system constituted either by n directive antennae n>m, each antenna being able to receive signals in one of its own angular sectors, the angular sectors of the n antennae essentially not overlapping each other and together thrilling a total angular sector of 360 degrees, or a multi-sector antenna with n angular sectors n>m the n angular sectors essentially not overlapping each other and having a distinct access; and switching means to associate with each signal receiver channel an antenna from among the n antennae according to a switching schema selected by control means, the switching schema being selected from a plurality of switching schemas of a switching matrix according to a criterion representing the quality of the reception of the signals by said signal receiver channels.
摘要:
The present invention relates to a band rejection filter. The band rejection filter includes a first signal transmission channel called a direct channel and a second signal transmission channel called a secondary channel. The direct channel and the secondary channel being designed to introduce at a first rejection frequency a phase difference of 180° between the signal circulating via the direct channel and the signal circulating via the secondary channel. Additionally, the secondary channel includes a filtering element for which the cut-off frequency is different from the first rejection frequency in a way to create a second rejection frequency.
摘要:
The present invention relates to a terminal for the broadband transmission of video, audio or data signals in a domestic environment. It applies more specifically in the scope of terminals operating according to the standard IEEE 802.11n and employing simultaneously several frequency channels in a predetermined band of frequencies, for example the 5 GHz WiFi band. The terminal comprises M antennas, a MIMO device able to generate MIMO signals in said predetermined frequency band from baseband signals or conversely, said MEMO device being able to process N MIMO signals simultaneously, and a switching device to connect the MIMO device to the M antennas. According to the invention, the NINO device comprises two MIMO circuits, one operating in a first sub-band of the predetermined band and the other in a second sub-band of the predetermined band, the two sub bands being non-overlapping and the switching device is adapted to connect said two MIMO circuits to the antennas so that each of said M antennas is able to receive or transmit one of the MIMO signals of the first MIMO circuit and to receive or transmit one of the MIMO signals of the second MIMO circuit simultaneously. The switching device also comprises a filtering device associated with each antenna in order to isolate, in reception, the MIMO signal of the first sub-band of the MIMO signal from the second sub-band received or transmitted by said antenna.
摘要:
The present invention relates to a multiple-port dual-band antenna system and the associated interface formed by DPDT or SPDT switches, that can be integrated on one and the same multi-layer structure.
摘要:
The present invention relates to a multiple-port dual-band antenna system and the associated interface formed by DPDT or SPDT switches, that can be integrated on one and the same multi-layer structure.
摘要:
The system for receiving broadcast digital data (in particular pay television services) comprises a master digital terminal, and at least one slave digital terminal connected to the master terminal by a link and able to receive protected digital data. The slave digital terminal can access the protected data only if information necessary for accessing the data and received by the master digital terminal is sent by way of link to the slave digital terminal within a predetermined deadline. This information is in particular access entitlements to television services or keys for descrambling the services.
摘要:
The present invention relates to a multimedia mobile terminal capable of transmitting and receiving signals compliant with several standards in the UHF band. It comprises: a receiver receiving a first signal compliant with a first standard in a first frequency band, a first transmitter capable of transmitting a second signal compliant with a second standard in a second frequency band different from the first frequency band and partially intersecting the first frequency band, wherein, between the receiver and the antenna, a calibrated band-rejection filter comprising at least one variable element enabling the selection of a rejection frequency by the control voltage of said variable element. a filtering control element to store the control voltage values and the associated rejecting frequency values determined during a calibration procedure and to transmit according to the second frequency of the first transmitter the stored control voltage of said variable element of said band-rejection filter.
摘要:
The invention relates to a dual-response stopband filter as well as to a filtering device comprising such a filter. The dual-response stopband filter comprises between the input terminal and the filter output a first direct channel and a second channel, known as a secondary channel, coupled with the first channel and forming a resonant element. The filter further comprises, integrated on the first direct channel, a selective low-pass filter to reject a first selected frequency band and, integrated on the second channel a variable capacitor to form the stopband filter of a second frequency band that can be determined. The switching device is associated with the first channel to switch the low-pass filter and the second channel to switch the stopband filter.