摘要:
An antenna system for reception of channel signals form the UHF band by a receiver, including an electrically small antenna and, connected between the port connected to the antenna and that of the receiver, an active impedance matching device controlled by command signals depending on the quality of the signal received by the receiver to compensate for the impedance variations due to the environment associated with the antenna and to reject the frequencies of interfering channels adjacent to the reception channel without interfering with the active impedance matching of the antenna.
摘要:
The invention relates to an antenna system for reception of channel signals from the UHF band by a receiver, comprising an electrically small antenna.The system also comprises, connected between the port connected to the antenna and that of the receiver, an active impedance matching device controlled by command signals depending on the quality of the signal received by the receiver to compensate for the impedance variations due to the environment associated with the antenna and to reject the frequencies of interfering channels adjacent to the reception channel without interfering with the active impedance matching of the antenna.
摘要:
The present invention relates to a diversity antennas system comprising at least two antennas of the dipole type each formed by a first and a second conductive arm, supplied differentially wherein the two antennas comprise a common arm called first arm forming at least one cover for an electronic card and each one a second arm mounted in rotation at one extremity of the first arm.
摘要:
The invention provides a dielectric resonator oscillator DR, especially for transmission devices whose oscillating frequency may take several values. The oscillator uses two interfering conductors 30 and 31 switched so that they may or may not form a metal plane close to the dielectric resonator DR in order to vary the frequency of the oscillator while using a single resonator. The interfering conductors 30 and 31 are located in the cavity CAV close to the resonator DR and the switching means may or may not establish an electrical contact between the said interfering conductors 30 and 31.
摘要:
The invention concerns a system of antennas on the same support. Each antenna is connected to a first port for the emission/reception in a first frequency band, and to a second port for the emission/reception in a second frequency band. The invention consists in a specific dimensioning of the support, such that the difference of the perimetric lengths separating the median points is a function of the half wavelength λ/2 modulo k λ, k positive integer, where λ is the wavelength corresponding to a working frequency fr.
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 method for calibrating a terminal with a multi-sector antenna in a mesh broadcasting network that comprises at least one other terminal. The method includes: the selection of one sector of the terminal antenna to be calibrated, the reception by the selected sector, of identification signals transmitted by each of the other terminals present in the network, as well as the information on the received signal level; and the storage, for each sector, of different identification signals of the terminals present in the network, and of the information on received signal level, into the memory of the terminal to be calibrated.
摘要:
The invention relates to a data transmission system comprising an antenna provided with a monopole radiating element held in place by an earth plane provided with a conducting surface. According to the invention, the radiating element is located facing the surface of the earth plane so as to interact with the latter in order to improve its performance.
摘要:
The present invention relates to a multi-sector radiating device intended to receive and/or transmit electromagnetic signals, comprising at least, arranged on a plane substrate: a first set of antennas, with: a first antenna, a second antenna, a third antenna, arranged in the opposite manner to the first antenna, a fourth antenna, arranged in the opposite manner to the second antenna, the antennas being longitudinal radiation slot type antennas, said antennas each presenting a bisector, wherein the radiating device comprises a switching circuit capable of activating one or more of the antennas, and notably all the antennas of the first set of antennas, -and in that the bisectors of the opposed antennas on the substrate are not combined.
摘要:
The present invention relates to a diversity antennas system comprising at least two antennas of the dipole type each formed by a first and a second conductive arm, supplied differentially wherein the two antennas comprise a common arm called first arm forming at least one cover for an electronic card and each one a second arm mounted in rotation at one extremity of the first arm.