58results about How to "High isolation between sending and receiving" patented technology

The invention discloses a device for improving the transmitting and receiving isolation of a mobile terminal, which is positioned between a diplexer and a signal receiving terminal. The device comprises a first coupler which is connected with the diplexer and the signal receiving terminal and is also connected with a modulation circuit and used for coupling a leak signal transmitted from the diplexer with a modulated signal transmitted from the modulation circuit; then the signal after coupling is transmitted to the receiving terminal; and the device also comprises the modulation circuit which is used for modulating a part of an emitting signal and sending the signal after modulation to the first coupler and a second coupler which is connected with the diplexer and an emitting terminal and is also connected with the modulation circuit and is used for coupling a part of the emitting signal to output to the modulation circuit. The invention also discloses a corresponding method to determine the modulation circuit structure and the modulation values of the amplitude, the delay and the phase regulating values of the part of the emitting signal according to the leak signal; the modulation signal is coupled with the leak signal, and the signal after coupling is input into the receiving terminal. The invention can improve the quality of receiving signals, reduce the requirements of the diplexer and so on to isolation and extend standby time.

A mixed circulator of high transceiver and isolation type is compounding three power dividers and one hybrid ring on media substrate, series-connecting said power dividers and equally divided end of hybrid ring to be ring form, using difference end of hybrid ring as emission end of circulator, using sum end of one power divider as antenna end of circulator and using sum end of another power divider as receiving end of circulator then setting ground resistance separately on each port.

The invention relates to a radar detection technology, and provides a method and a device for detecting radar acquiring low-altitude wind profiles through combination of a frequency-modulated continuous-wave radar technology and a wind profile radar technology against the poor low-altitude detection capability of the existing equipment. One phased-array antenna is adopted to transmit serrated linear frequency-modulated continuous waves, and the other phased-array antenna is adopted to receive echo signals, thus forming a dual-antenna working mode of continuous-wave radar. The array surfaces of the two antennas are horizontally placed side by side with opening surfaces facing upward. Time-sharing scanning is carried out to form five detection wave beams which are the same with wind profile radar, and detection signals and data of the five wave beams are processed in the same way that signals and data of wind profile radar are processed so as to obtain a low-altitude wind profile of which the smallest height can be as small as 50m to 10m and other basic data products. A low-altitude continuous-wave wind measuring radar manufactured by adopting the method and the device of the invention has a wide range of applications.

The invention relates to an isolating device for a UHF-band RFID reader, which comprises a power amplifying and filtering unit, an antenna unit, a receiving unit and a directional coupler unit, wherein the input port (pin 1) of the directional coupler unit is connected with the power amplifying and filtering unit; the output port (pin 2) is connected with the antenna unit; and the isolating port (pin 3) is connected with the receiving unit. The isolating device for the UHF-band RFID reader has the advantages that: due to the adoption of a coupler unit, the isolating device improves the isolation of the receiving and the transmitting of an RFID reader, can effectively solve the problem of carrier leak, and is particularly suitable to be used in a space with a complex internal environment (for example, the internal space of a handheld RFID reader).

The invention provides a multi-network co-channel processing method applied to a multi-network indoor distributed system. The multi-network co-channel processing method comprises the steps of: 1, carrying out http: / / dict.cn / 9%3F@@*=%3F2@@@5%250uplink and downlink output on one path of network signals accessed from an antenna interface through an LC (Inductor Capacitor) filter, and carrying out http: / / dict.cn / 9%3F@@*=%3F2@@@5%250uplink or downlink output on the other path of network signals through a dielectric duplexer; and 2, carrying out uplink or downlink output on network signals accessed from the antenna interface through two dielectric duplexers respectively. The invention has the characteristics of reinforcing receiving-transmitting isolation which can be 60 dB at different frequencies, reducing low-noise amplifier saturation caused by signal leakage in a non-working area, and being small in volume and light in weight, and is suitable for being applied in network communication.

The invention provides an interphone repeater which solves the problems that an existing interphone repeater is large in size and not suitable for being moved or used in emergency. The interphone repeater comprises a shell, a transceiving controller and a duplexer, wherein the transceiving controller and the duplexer are installed in the shell and are electrically connected. The duplexer comprises a duplex integrated circuit board, a transmitting filter, a receiving filter and a porous metal duplex groove, wherein the transmitting filter and the receiving filter are installed on the duplex integrated circuit board, and the porous metal duplex groove covers the transmitting filter and the receiving filter. The transmitting filter and the receiving filter respectively comprise a plurality of coils. The porous metal duplex groove comprises a plurality of cavities corresponding to the coils in a one-to-one mode. The shell comprises a shell cover and a shell body, wherein the porous metal duplex groove is formed in the shell body.

This invention relates to a sonic surface wave duplexer used for cluster communication system hand-held terminal, comprising a transmitting end first sonic surface wave filter and a receiving end sonic surface wave filter, a transmitting end second sonic surface wave filter located in the front of power amplifier, wherein, the outlet of transmitting end second sonic surface wave filter attaches to the inlet of transmitting circuit power amplifier, then to transmitting end first sonic surface wave filter inlet, the other end via electrode attaches to the front section of transmitting circuit power amplifier, the said transmitting end second sonic surface wave filter is composed of sonic surface wave filter in form of ladder and sonic surface wave band-reject filter, which is formed through making the resonator and external inductance attach in the shape of II. The invention has the advantages of high receive-and-transmit isolation, low insertion loss, small volume and so on.

The invention discloses a broadband channelized transceiver which comprises a radio frequency transceiver module, a channel frequency conversion module, an intermediate frequency transceiver module and a control module.The device utilizes the radio frequency transceiver module, the channel frequency conversion module, the intermediate frequency transceiver module and the control module which are sequentially connected.When receiving the signal, the radio frequency signal received by the radio frequency transceiver module is divided into radio frequency signals of different working frequency bands by the channel frequency conversion module and is mixed and sentto the intermediate frequency transceiver module;and an effective intermediate frequency geophone channel is judged by a control module according to a detection signal sent by a plurality of intermediate frequency geophones and a preset threshold value, at the same time, corresponding control signals are generated for SPMT IF switches. The IF transceiver module controls the opening and closing of SPMT IF switch according to the control signal of the control module to realize the signal input or output of the corresponding IF power divider, and realizes the signal transceiver mode of wideband RF input, narrowband IF output, narrowband IF input and wideband RF output.