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

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 discloses a signal interference suppression device, which comprises a first duplexer, a second duplexer, a third duplexer, a fourth duplexer, a first combiner, a second combiner, a first circulator, a second circulator, a first attenuator and a second attenuator, wherein a TX/RX port of the first duplexer is connected with a first port of a base station; a TX port of the first duplexer is connected to the first combiner through the first circulator, and an RX port of the first duplexer is connected to the second combiner through the first attenuator; a TX/RX port of the second duplexer is connected with a second port of the base station, a TX port of the second duplexer is connected to the first combiner through the second circulator, and an RX port of the second duplexer is connected to the second combiner through the second attenuator; the first combiner is connected with a TX port of the third duplexer and a TX port of the fourth duplexer; the second combiner is connected with an RX port of the third duplexer and an RX port of the fourth duplexer; a TX/RX port of the third duplexer is connected with a first port of an antenna feed system; and a TX/RX port of the fourth duplexer is connected with a second port of the antenna feed system.

The invention discloses a remote displacement measurement device, system and method having a clutter inhibition function. The system comprises a central controller, at least one main measurement device and at least one secondary measurement device, wherein the main measurement device is used for sending an emission signal to the secondary measurement device, receiving a forwarding signal emitted by the secondary measurement device and calculating relative displacement according to the received forwarding signal, the secondary measurement device is used for receiving the emission signal of the main measurement device and emitting the forwarding signal, and the main measurement device and the secondary measurement device both have two sets of polarized orthogonal antennas. When the main measurement device emits the signal, natural landform scattered strong clutter signals and a polarized direction of an emission antenna are consistent, polarized characteristics of a reception antenna and the emission antenna are in polarized orthogonal, so the reception antenna has the quite strong inhibition effect on background clutter, so system precision is improved; during cofrequency transmit-receiving, an acquired transmit-receiving isolation degree can be greater compared with a single antenna and the double polarized antennas, a large measurement distance is acquired through enhancing emission power.

The invention discloses a transmission treatment method of an optical fiber repeater and a variable-channel transmission optical fiber repeater, wherein the repeater comprises the modules of a power supply, a microprocessor, an antenna feeder system, a plurality of radio receivers, a plurality of radio transmitters, optical fibers, a wavelength division multiplexer, a wavelength decomposition multiplexer, a radio signal division mixer, an optical transmission signal adaptor, an optical transmission interface and the like. The invention is capable of providing radio communication relay transmission service for all radio communication system users in special regions and tunnels, meets the requirements of reducing the number of antennas, reducing the number of the used optical fibers, reducing mutual interference among systems and meeting the insulation among the systems, is capable of realizing long-distance optical transmission relay among the optical fiber repeaters when the optical fibers are cascaded to the optical fiber repeaters, and has the characteristics of being applicable to a plurality of radio communication systems for relay transmission.

The invention discloses an off-axis reflection-type optical antenna design method applied to space laser communication. The off-axis reflection-type optical antenna design method includes the following steps: determining an optical antenna objective lens initial structure; calculating and selecting an optical antenna overall initial structure; conducting aberration correction; conducting optical antenna error analysis; conducting isolation analysis. According to the off-axis reflection-type optical antenna design method, under the condition that the caliber, the view field and the amplification factor of an optical antenna are guaranteed, the focal distance, the wave aberration, the structural style, the error distribution and the like of the optical antenna are analyzed and calculated. By means of the off-axis reflection-type optical antenna design method, the image quality, the isolation degree and the transmission efficiency of the laser communication optical antenna can be accurately evaluated, and correlation technical indexes of the optical antenna in the laser communication field are improved.

The invention discloses a highly integrated four-channel S-band transceiver module, comprising a receiving channel, a transmitting channel and an external interface, wherein the receiving channel comprises paired band branch I and Q receiving channels, and the transmitting channel comprises paired band branch I and Q transmitting channels. The two-port feeding of the transceiver module can effectively improve the circular polarization axis ratio of the antenna, and the transceiver channels are separated, which can improve the isolation of the transceiver, reduce the interference between channels and help to improve the communication capability of the system. Furthermore, the invention also discloses a phased array antenna with the high-integration four-channel S-frequency transceiver module, which can realize polarization adjustability by cooperating with a four-point feeding antenna unit, realizes polarization conversion and beam scanning of the phased array antenna through electroniccontrol phase shift and branch switching, effectively reduces the antenna port surface, and realizes miniaturization design.

The invention discloses a branching optical fiber repeater which is composed of a power source, a microprocessor, an antenna feed system, a wireless receiver, a wireless transmitter, optical fiber, an analog-digital converter, a digital-analog converter, a time division multiplexing device, a time division de-multiplexing device, a wireless signal dividing and combining unit, an optical transmission signal adaptor, an optical transmission interface and other modules. An optical fiber repeater branching transmission method is capable of providing wireless communication relay transmission service for various types of wireless communication system users in a special region and tunnels, reducing the number of antennae and optical fiber, increasing relay transmission distance, reducing system cost and reducing mutual interference between systems and suitable for carrying out relay transmission for various wireless communication systems.

The invention discloses a low-cost broadband millimeter wave array antenna, and belongs to the technical field of antennas. The antenna comprises a metal horn part and a back cavity patch antenna, wherein the metal horn part comprises at least two metal horn antenna units for transmitting and two metal horn antenna units for receiving which are distributed in an array; and the back cavity patch antenna comprises an antenna feed dielectric plate, and transmitting feed units and receiving feed units which are arranged on the antenna feed dielectric plate correspond to the transmitting metal hornantenna units and the receiving metal horn antenna units in number respectively. The metal horn part is attached to the back cavity patch antenna through conductive adhesive, and each patch antenna radiation source is attached to the lower portion of the corresponding metal horn antenna unit. The antenna can be realized only through a mature, simple and low-cost machining process and a standard single-layer PCB process; and meanwhile, other properties such as return loss, bandwidth and radiation pattern keep excellent characteristics.

The invention provides a photoelectric fusion continuous wave radar leakage interference elimination device and method, and belongs to the technical field of radars. According to the photoelectric fusion continuous wave radar leakage interference elimination device, leakage interference is eliminated by adopting a microwave photon link and cable link fusion active cancellation method. And the microwave photon link regulates and controls the phase, delay and amplitude of the reference signal led out by the continuous wave signal emission source to achieve the cancellation matching conditions ofphase inversion, delay matching and equal amplitude with the leakage interference signal. The photoelectric fusion continuous wave radar leakage interference elimination device has the advantages ofwide working frequency band range, large bandwidth and high regulation and control precision, effectively suppresses leakage interference signals, and ensures high transceiving isolation of the continuous wave radar.

The invention discloses a miniaturized three-band satellite communication antenna comprising three radiation sheets (11, 12 and 13) respectively working in three bands, a feed network (2) and a base (3), wherein the three radiation sheets are stacked and fixed on the base (3) through a lamination screw; and the feed network (2) is connected with the radiation sheet stacked at the bottommost layer into a whole and used for respectively feeding the three radiation sheets. By using the miniaturized three-band satellite communication antenna, the design and installation problems of an antenna in a miniaturized terminal are solved.

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.

The invention discloses a C frequency band miniaturization one-transmitter four-receiver medium frequency unit, which is used for a C frequency band on-board satellite communication system. The C frequency band miniaturization one-transmitter four-receiver medium frequency unit is constituted by a modulator, a demodulator, a frequency synthesizer, an amplifier, an attenuator, an attenuation amplifier, a filter, a filter amplifier, and a switch, and is controlled by serial interfaces. The C frequency band miniaturization one-transmitter four-receiver medium frequency unit is especially suitablefor being used as a transceiving integrated medium frequency unit of an on-board satellite communication terminal, and has advantages of miniaturization, low power consumption, integrated design, high speed frequency hopping, high transceiving isolation degree, stable performance, and ability of functioning normally in severe environment. The C frequency band miniaturization one-transmitter four-receiver medium frequency unit comprises four separation cavities, and transceiving signals are effectively isolated from each other by adopting spatial cavity separation, and then transmitting signals are prevented from being coupled with receiving signal by the space, and receiving performance cannot be affected; and in addition, by adopting effective filtering of transceiving medium frequency control signals, the high frequency signals of the control signals can be filtered effectively, and the demodulation performance of the receiving medium frequency unit can be obviously improved.

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 discloses a full-duplex meteoric trail communication device based on a single antenna, and relates to the field of meteoric trail communication. The device comprises a link controller, a modem, a transceiver, a power amplifier, and a diplexer. The device employs the diplexer which is large in withstood power, is small in incoming loss, and is high in receiving and transmitting isolation. A receiving channel and a transmitting channel are combined into one full-duplex channel under the condition of guaranteeing the communication performance of a system. The full-duplex communication between different meteoric trail communication devices can be completed through one antenna, thereby reducing the number of antennas, reducing the requirements for an antenna construction field, and shortening the starting construction time of meteoric trail communication. The device is large in withstood power, is high in receiving and transmitting isolation, is simple and convenient in starting construction, is high in integration degree, is stable and reliable in performance, is especially suitable for a meteoric trail communication occasion where the antenna construction field is limited and there are special requirements for starting construction.

The invention belongs to the technical field of radio frequency identification, in order to solve the problem of low identification rate of some angles in long-distance identification of identity cardinformation, the invention provides an identification card information collecting device, an identification system and a door body. The collecting device comprises a first antenna, which is used forexciting the identity card in a first posture and sending a reading instruction to the identity card. A second antenna arranged perpendicularly to the first antenna for exciting the ID card in the second posture and sending a reading instruction to the ID card; a third antenna disposed in parallel with and partially coinciding with the second antenna for receiving feedback information of the identity card. The ID card in the first posture is excited by the first antenna, the ID card in the second posture is excited by the second antenna, and the feedback information of the ID card is receivedby the third antenna, so that the excitation of the ID card and the reception of the feedback information of the ID card in a long distance can be realized.

According to an aspect there is provided a duplex filter arrangement (100) for frequency-division duplex communication. The duplex filter arrangement (100) comprises a filtering arrangement that comprises filters (102) of a first type, a filter (104) of a second type and a filter (106) of a third type connecting a first radio frequency port (108), a second radio frequency port (110), a third radiofrequency port (112) and a fourth radio frequency port (114). The filters (102, 104, 106) are configured so that some of the filters are configured to pass signals at a first frequency band and reject signals at a second frequency band, and some of the filters are configured to reject signals at the first frequency band and pass signals at the second frequency band. Further, the filters (104, 106) of the second type and the third type are configured so that the phase response of the filter (104) of the second type differs at the first frequency band and at the second frequency band substantially 180 degrees from the phase response of the filter (106) of the third type. This enables implementing a duplex filter arrangement without using additional baluns that cause transmitter and receiverlosses.

The invention relates to the technical field of antenna array design of millimeter wave security check imaging, and discloses a strip line feed horn antenna applied to millimeter wave security check imaging. According to the strip line feed horn antenna applied to millimeter wave security check imaging, a microstrip line-to-strip line structure is arranged on a printed circuit board, a choke groove is additionally formed between a transmitting antenna array and a receiving antenna array, and the microstrip line-to-strip line structure is used for realizing conversion from a microstrip line toa strip line; and the choke groove is used for suppressing interference signals outside reflection cavities of the transmitting antenna array and the receiving antenna array so as to improve the receiving and transmitting isolation. The strip line feed horn antenna applied to millimeter wave security check imaging has the characteristics of wide band, high efficiency, high isolation, simple structure and high assembly reliability.